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INSTRUCTION MANUAL
MODEL 166 50 MHz PULSE/
FUNCTION GENERATOR
WAVETEK SAN DIEGO
9045 BALBOA AVENUE, SAN DIEGO, CALIFORNIA
INSTRUCTION MANUAL
MODEL 166 50 MHz PULSE/
FUNCTION GENERATOR
© - 1978 Wavetek
THIS DOCUMENT CONTAINS INFORMATION PROPRIETARY TO WAVETEK. THE INFORMATION IN THIS DOCUMENT IS NOTTO BE USED OR DUPLICATED IN ANY MANNER WITHOUT THE PRIOR APPROVAL IN WRITING OF WAVETEK.
V'VAVETE~ SAN DIEGO 9045 Balboa Ave., San Diego, Calif. 92123 P. 0. Box 651, San Diego, California 92112 Tel 714/279-2200 TWX 910-335-2007
Manual Revision 3/80 Instrument Release F-3180
WARRANTY
All Wavetek instruments are warranteed against defects in material and workmanship for a period
of one year after date of manufacture. Wavetek agrees to repair or replace any assembly or
component (except batteries) found to be defective, under normal use, during this period.
Wavetek's obligation under this warranty is limited solely to repairing any such instrument which in
Wavetek's sole opinion proves to be defective within the scope of the warranty when returned
to the factory or to an authorized service center. Transportation to the factory or service center
is to be prepaid by purchaser. Shipment should not be made without prior authorization by
Wavetek.
This warranty does not apply to any products repaired or altered by persons not authorized by
Wavetek, or not in accordance with instructions furnished by Wavetek. If the instrument is
defective as a result of misuse, improper repair, or abnormal conditions or operations, repairs will
be billed at cost.
Wavetek assumes no responsibility for its product being used in a hazardous or dangerous manner
either alone or in conjunction with other equipment. High voltage used in some instruments may
be dangerous if misused. Special disclaimers apply to these instruments. Wavetek assumes no
liability for secondary charges or consequential damages and, in any event, Wavetek's liability for
breach of warranty under any contract or otherwise, shall not exceed the purchase price of the
specific instrument shipped and against which a claim is made.
Any recommendations made by Wavetek for use of its products are based upon tests believed to be
reliable, but Wavetek makes no warranty of the results to be obtained. This warranty is in lieu of -- -·· ·-··· ·-····
all other warranties, expressed or implied, and no representative or person is authorized to
represent or assume for Wavetek any I iabil ity in connection with the sale of our products other
than set forth herein.
SECTION 1
SECTION 2
SECTION 3
SECTION 4
SECTION 5
SECTION 6
SECTION 7
CONTENTS
GENERAL DESCRIPTION
1.1 MODEL 166 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.2 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.2.1 Versatility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.2.2 Sweep/Function Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.2.3 Frequency Precision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1.2.4 Amplitude Precision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1.2.5 Waveform Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1.2.6 Pulse Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1.2.7 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
INITIAL PREPARATION
2.1 MECHANICAL PREPARATION............................ 2-1 2.2 ELECTRICAL INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2.2.1 Power Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2.2.2 Signal Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2.3 ELECTRICAL ACCEPTANCE CHECK . . . . . . . . . . . . . . . . . . . . . . . 2-2
OPERATION
3.1 CONTROLS AND CONNECTORS 3.2 WAVEFORM TIMING ................................. . 3.3 OPERATING PROCEDURE .............................. . 3.3.1 Continuous, Triggered and Gated Operation ................. . 3.3.2 Voltage Controlled Frequency (VCG) Operation .............. . 3.3.3 Sweep Operation ................................... .
3-1 3-4 3-4 3-6 3-6 3-6
3.3.4 Pulse Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7 3.3.5 Voltage Controlled Amplitude (VCA) Operation . . . . . . . . . . . . . . . 3-7
CIRCUIT DESCRIPTION
4.1 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 4.2 BASIC WAVEFORM DEVELOPMENT . . . . . . . . . . . . . . . . . . . . . . . 4-1 4.3 WAVE SHAPE AND AMPLIFICATION . . . . . . . . . . . . . . . . . . . . . . . 4-1 4.4 TRIGGERED AND GATED MODES . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 4.5 SWEEP GENERATOR MODES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
CALIBRATION
5.1 FACTORY REPAIR..................................... 5-1 5.2 REQUIRED TEST EQUIPMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 5.3 CALIBRATION........................................ 5-1
TROUBLESHOOT! NG
6.1 fNTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 6.2 ACCESS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 6.3 TEST EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
PARTS AND SCHEMA TICS
7.1 DRAWINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 7.2 ORDERING PARTS.................................. . . . 7-1 7.3 ADDENDA.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
iii
SAFETY
This instrument is wired for earth grounding via the facility power wiring. Do not bypass earth
grounding with two wire extension cords, plug adapters, etc.
BEFORE PLUGGING IN the instrument, comply with installation instructions.
MAINTENANCE may require power on with the instrument covers removed. This should be
done only by qualified personnel aware of the electrical hazards.
WARNING notes call attention to possible injury or death hazards in subsequent operation.
CAUTiON notes cail attention to possible equipment damage in subsequent operations.
v
","NE•,,• l!', ~'
vi
'luA1,1&
~N\.'HHW' ·rr~r ... NS!TION 1'!*•'-f.
Figure i - Model 166 50 MHz Pulse/Function Generator
.F, •ii ,,, \I
•
1.1 MODEL 166
The Model 166 Pulse/Function Generator is a combination sweep, function and pulse generator with a full complement
of features in all modes of operation. The frequency range
is from 0.0001 Hz (2.8 hours per cycle) to 50 MHz. Waveforms are sine, triangle, ramp, square, pulse, positive pulse
and negative pulse. The waveforms may be amplitude con
trolled, de offset and inverted (complemented).
Pulse versatility includes variable width and independently
variable leading and trailing edge transition times. The generator can be used to generate an output pulse whose width and frequency are dependent upon an external signal input.
Sweep can be logarithmic, as well as linear. The output can be stopped at the start and stop frequencies for accurate setting. Besides continuous sweep, a sweep may be triggered
from the quiescent start frequency. The frequency can sweep to the upper (stop) frequency, then return to start
frequency, or it can be held at the upper frequency. The
duration of the sweep can be set to be from 100 seconds to
100 micro-seconds.
The generator can give a continuous output, be triggered for one cycle, or a double cycle, or gated for many cycles.
The output waveform can be presented in haverwave mode; i.e., the selected waveform starts and stops at a positive or
negative peak voltage.
The signal being generated may be frequency or amplitude
modulated by external signals.
1.2 SPECIFICATIONS
1.2.1 Versatility
Jnstrument operates as a sweep/function generator or a pulse generator.
1.2.2 Sweep/Function Generator
Selectable Waveforms Sine I\.; , triangle 'V , ramp ~and square ~ . All can be inverted 180°. Ramp up-down ratio can be as large as 1: 1000. All can be amplitude and frequency modulated.
SECTION 1 GENERAL DESCRIPTION
Operational Modes Continuous: Generator oscillates continuously at selected frequency.
Triggered: Generator quiescent until triggered by external signal or manually, then generates one cycle.
Double Triggered: As triggered mode, except two cycles
are generated.
Triggered Haverwave: As triggered mode. Output is one cycle starting at -90° (or +90°).
Gated: As triggered, except output continues for duration of gate.
Gated Haverwave: As gated. Output is a burst of cycles starting at -90° (or +90°).
Continuous Sweep: Generator frequency continuously sweeps up from start to stop frequency.
Triggered Sweep: Generator oscillates at sweep start fre
quency until triggered, then generates one sweep to the stop frequency and returns to the start frequency.
Sweep and Hold: As triggered sweep mode, except the generator remains at stop frequency unt11 the trigger signal falls,
then returns to start frequency.
Frequency Range 0.0001 Hz to 50 MHz in 11 ranges. Maximum sweep 1000: 1
in linear or logarithmic mode.
Sweep Time Range 100s to 100 µs in 6 ranges.
Function Output Variable to 30V p-p into open circuit ( 15V p-p into 50Q).
DC offset of waveform is adjustable to ±10V open circuit
(±5V into 50Q). Voltage attenuation 0 to 80 dB: to 60 dB in 20 dB steps, plus 20 dB continuous vernier.
1-1
Low Frequency Hold Function output will hold at the instantaneous voltage level when the hold switch is depressed. Effective in the X 0.001 Hz to X 10 Hz ranges. Amplitude Drift: Less than 0.2% of amplitude per minute.
DC Offset DC offset of all waveforms is adustable to ±10V open circuit (±5V into 50n). Waveform plus offset is limited to ±15V open circuit (±7.SV into 50n).
GCV Outpul 0 to SV (nominal, open circuit) proportional to the frequency of the main generator. Output impedance is 600n.
Sweep Output 0 to +5V (nominal, open circuit) ramp. Output impedance is 600n. Sweep time is 1 OOs to 100 µs.
VCG (FM) - Voltage Controlled Generator Up to 1000: 1 frequency change with external 0 to +5V signal. Mode: Linear or logarithmic. Slew Rate: 2% of range per µs. VCG Linearity: 0.0005 Hz to 50 kHz ±0.5% of range.
Voltage Controlled Amplitude (AM) 0 to ±5V gives 0 to 30V amplitude change. AC input allows 0 to 200% modulation (suppressed carrier). AC Input Range: SV minimum for 100%, 10V minimum for 200% AM. Input Impedance: 4.99 to 10 kn, depending on gain control.
-------ini:>u_i_Bandwidth: 10 kHz.
Trigger Input Trigger Signal: 1V p-p minimum. Trigger Level: ±5V. Input Impedance: 1.S kn, 30 pF. Maximum Repetition Rate: 2S MHz.
1.2.3 Frequency Precision
Dial Accuracy (For rv , /'y , 'l.J and linear dial settings of 0.5 to 5) ±2% of full scale for 0.0005 Hz to S MHz. + 15%, - 6% of full scale for 5 to 50 MHz.
1.2.4 Amplitude Precision
Amplitude Change With Frequency Sine and square variations less than: ±0.1 dB to 100 kHz; ±0.2 dB to 1 MHz; ± 3 dB to 50 MHz.
1-2
Step Attenuator Accuracy ±0.3 dB per 20 dB step to 100 kHz.
1.2.5 Waveform Characteristics
Sine Distortion (Test at 10V p-p normal sine wave) Less than O.S% for 10 Hz to 100 kHz. All harmonics greater than: 30 dB down for 100 kHz to 5 MHz; 20 dB down for S to 50 MHz.
Triangle Linearity Greater than 99% for O.OOS Hz to 100 kHz.
Square Wave Aberrations (Test at 10Vp-p) Less than 5% of p-p voltage.
1.2.6 Pulse Generator
Pulses Variable amplitude positive or complementary pulsesn__J, Lii. Pulse amplitude, width and rise/fall times are independently adjustable and independent of frequency. TTL and TTL pulse widths are simultaneous with main pulse. AM and FM modulation. All pulses can drive son terminations.
Operational Modes Continuous, Triggered, Double Triggered, Gated and Continuous Sweep. (See Sweep/Function Generator.)
External Width: An external signal at the trigger input - --- detemrineslhe-uutpULpatse-width--arrdfrequerrcy:-
Pulse Period Range Pulse period is selectable from 20 ns to 1 O,OOOs (SO MHz to 0.0001 Hz) with approximately 1% vernier.
Pulse Width 10 ns to 100 ms in 7 ranges. Maximum duty cycle is 70% for periods to 200 ns, decreasing to SO% for 20 ns periods. Control has nominal SO% duty cycle detent.
Transition Time 7 ns to 50 ms in 7 ranges, independently variable for leading and trailing edges.
Function Output 0 to ±1 SV into open circuit and 0 to ±7 .5V into son. Voltage attenuation 0 to 80 dB: to 60 dB in 20 dB steps, plus 20 dB continuous vernier.
TTL and TTL Pulses Transition times less than 4 ns into son termination.
1.2. 7 General
Stability Amplitude, de offset and frequency in linear mode to 500 kHz. Short Term: ±0.05% for 10 minutes. Long Term: ±0.25% for 24 hours.
Environmental Specifications apply at 25°C ±5°C after 30 minute warm-up. Instrument will operate from 0°C to +50°C.
Dimensions 36.2 cm (14% in.) wide; 13.3 cm (5% in.) high; 38.1 cm (15 in.) deep.
Weight 9.8 kg (21 % lb) net; 12.5 kg (27% lb) shipping.
Power 108 to 132V or 216 to 250V; 50 to 400 Hz; 50 watts nominal.
1-3
2.1 MECHANICAL PREPARATION
After unpacking the instrument, visually inspect all external
parts for possible damage to connectors, surface areas, etc.
If damage is discovered, file a claim with the carrier who
transported the unit. The shipping container and packing
material should be saved in case reshipment is required.
2.2 ELECTRICAL INSTALLATION
2.2.1 Power Connection
WARNING
To preclude injury or death due to shock, the
third wire earth ground must be continuous to
the facility power outlet. Before connecting to
the facility power outlet, examine extension
cords, autotransformers, etc., between the in
strument and the facility power outlet for a
continuous earth ground path. The earth ground
path can be identified at the plug on the instru
ment power cord; of the three terminals, the
earth ground terminal is the nonmatching shape,
usually cylindrical.
CAUTION
To prevent damage to the instrument, check for
proper match of line and instrument voltage
and proper fuse type and rating.
NOTE
Unless otherwise specified at the time of
purchase, this instrument was shipped from the
factory with the power transformer connected
for operation on a 108 to 126 Vac line supply
and with a 0.5 amp slow blow fuse.
Conversion to other input voltages requires a change in rear
panel fuse-holder voltage card position and fuse according
to the following table and procedure.
1.
SECTION 2 INITIAL PREPARATION
Fuse
Card Position Input Vac (Slow Blow, 3 AG)
100 90 to 105 0.5 amp
120 108 to 126 0.5 amp
220 198 to 231 0.25 amp
240 216 to 250 0.25 amp
Disconnect the power cord at the instrument, open
fuse holder cover door and rotate FUSE PU LL to left
to remove the fuse (figure 2-1).
Figure 2-1. Fuse Holder on Rear of Instrument
2. Remove the small printed circuit board and select
operating voltage by orienting the printed circuit
board to position the desired voltage on the top left
side. Push the board firmly into its module slot.
3. Rotate the FUSE PULL back into the normal position
and insert the correct fuse into the fuse holder. Close
the cover door.
4. Connect the ac line cord to the mating connector at
the rear of the unit and the power source.
2-1
2.2.2 Signal Connections
Use RGSSU son shielded cables equipped with female BNC connectors to distribute input and output signals when connecting this instrument to associated equipment.
2.3 ELECTRICAL ACCEPTANCE CHECK
This checkout procedure verifies the generator operation. If a malfunction is found, refer to the Warranty in the front of this manual. A 2 channel oscilloscope, a son load, a tee fitting and son coax cables are needed for this procedure (see figures 2-2 through 2-S).
Preset the pulse generator controls as follows:
Control Position
FREQUENCY Dial FREQ Range X1K FREQ VERNIER cw GEN MODE CONT TRIG LEVEL 10 o'clock LIN/LOG LIN DC OFFSET OFF VCA GAIN ccw WAVEFORM !\_; OUTPUT ATTEN 0 OUTPUT ATTEN VERNIER cw NORM/INVERT NORM SWEEP-MOUE. COITT-SWP SWEEP STOP cw SWEEP TIME 10s I 1 s SWEEP TIME VARIABLE 12 o'clock PULSE WIDTH 'L PULSE WIDTH VARIABLE cw TRANSITION TIME 7 ns I 50 ns LEADING EDGE cw TRAILING EDGE cw POWER ON
2-2
000
00
TRIG IN
0
VCA IN
MODEL 166
FUNC OUT
Figure 2-2. Initial Setup
MODEL 166
FUNC OUT
Figure 2-3. VCG Setup
MODEL 166
FUNC OUT
Figure 2-4. Trigger Setup
MODEL 166
FUNC OUT
Figure 2-5. VCA Setup
SCOPE
SCOPE
SCOPE
SCOPE
Table 2-1. Initial Checkout
Step Controi Position/Operation
Connect instrument as shown in figure 2-2 and sync scope to TTL output.
2 FREQ VERNIER Rotate ccw, then cw.
3 FREQ Range Check each position. Return to x 1.
4 HOLD Press and hold. Release.
5 FREQ Range X 1K.
6 OUTPUT A TTEN Rotate ccw. Return to cw.
VERNIER
7 OUTPUT ATTEN Check each position. Return to 0.
8 OUTPUT ATTEN Rotate to 9 o'clock. VERNIER
9 DC OFFSET Rotate cw thru -, 0 to +. Return to OFF.
10 OUTPUT ATTEN Vernier cw. VERNIER
11 WAVEFORM Check each position. Return to
n_____J •
I Observation
I~~~. 1 kHz sine wave, 15V p-p. de signal. Approximately 1 V.
I I CH1:
I CH1:
A small change in frequency ( 1 % of range).
Frequency increases from ccw to cvv positions.
Waveform stops and holds at a de level. Waveform
continuous when switch is released.
Amplitude of waveform decreases for ccw change.
Amplitude of waveform decreases in decade steps
as attenuation increases.
Waveform moves to a negative offset, then to a positive offset, as the control is rotated cw. Waveform clipping may occur at - and + ends of
control.
Each waveform is present; IL.._J and UI are both
positive going OV to +7.5V, but complementary to
each other.
NOTE: For proper waveform output in steps 12 through 16, the pulse period must be several times longer than the pulse
width and transition time. Change the FREQ range whenever necessary.
12
13
14
15
PULSE WIDTH
PULSE W!OTH VARIABLE
TRANSITION TIME
Rotate to each position. Return to 10 µs I 100 µs.
I Rotate ccw. Return to cw.
Rotate to each position. Return to 500 ns I 5 ns.
LEADING EDGE Rotate ccw.
Pulse width is narrow at ccw positions and 1.NLde.r at ~~--~---. ~, .... -... . ..----.. --.. -.. ...----.........__. ......... .
s_w positi.Qns.
Pulse 'J'!;dtf: ~ecomes i:arr·m•.1, ro,turris to \•.1ide
I I Transition time decreases ccw and increases cw.
I Waveform rise time increases, then returns to
\ original time.
2-3
Step
16
17
18
19
'l() LU
21
22
23
24
25
26
27
28
29
30
31
32
2-4
Initial Checkout (Continued)
Control Position/Operation Observation
TRAILING EDGE Rotate ccw. Waveform fall time increases, then returns to original time.
FREQ Range
NORM/INVERT
WAVEFORM
~JOR~v1/!NVERT
FREQUENCY Dial
GEN MODE
SWEEP TIME
LIN/LOG
SWEEP TIME VARIABLE
SWEEP MODE
FREQUENCY Dial
SWEEP MODE
SWEEP STOP
SWEEP MODE
MAN TRIG
XlK
INVERT, then NORM
!\;
11\1\IC:DT .._1~~~ l\lf"'ID~A 11\1. \I ~I\ i r d1t;11 1\IUllli/1.
Connect instrument as shown in figure 2-3.
Full cw. Sync the scope to CHl (FUNC OUT).
SWEEP.
Check each position. Return to 100 ms I 10 ms.
LOG. Return to LIN.
Rotate ccw. Return to cw.
SWP START.
Rotate from cw to ccw. Return to cw.
SWP STOP.
Rotate ccw. Return to cw.
TRIG SWP.
Press and release (try several times).
Waveform changes from positive pulse to negative pulse.
Waveform phase shifts 180°, from one switch posi ti un tu the other.
CHl: Waveform is swept from a low frequency to a high frequency. CH2: 0 to 5V ramp for each burst of swept waveforms.
Waveform is swept from a low frequency to a high frequency.
As the switch is rotated cw, the sweep duration decreases. (Observe CH2 on fast times.)
CH 1: Waveform has longer low frequency sweep in LOG mode .
. eHz: togarithmic-ramp inlOG mode.
Ccw increases sweep duration.
CH 1: Frequency approximately 50 Hz. CH2: 0 Vdc.
CH2: DC level increases from 0 to 5V, returns to ov.
CH2: Approximately 5V.
CH2: DC level decreases, returns to 5V.
CH 1: Frequency approximately 50 Hz. CH2: OV.
One burst of swept waveform, then returns to start frequency.
Step Control
33 SWEEP MODE
34 MAN TRIG
35 SWEEP MODE
36 FREQUENCY
37
38 GEN MODE
39 GEN MODE
40 GEN MODE
41 GEN MODE
42 GEN MODE
43 WAVEFORM
44 GEN MODE
45 TRIG LEVEL
46
47 GEN MODE
48 OUTPUT
VERNIER
49 WAVEFORM
50 VCA GAIN
Initial Checkout (Continued)
PositioniOperation
I SWP HOLD.
I Press and hold, then release.
I CONTSWP
1
l Connect instrument as shown in
figure 2-4.
TRIG. (Trigger scope on CH2.)
Adjust scope for several triggered
cycles.
DBL TRIG.
TRIG HAV.
GATED. Adjust scope for several
bursts of waveforms.
GATED HAV.
fl__J_
EXT WIDTH.
Rotate slowly.
Return to 10 o'clock.
Connect instrument as shown in
figure 2-5.
CONT.
12 o'clock.
Rotate from ccw to cw.
I
Observation
Waveform sweeps up to high frequency and remains
while switch is held, returns to start frequency when
switch is released.
CH 1: Each waveform is one complete cycle.
CH2: 0 to 5V ramp.
Each waveform is two complete cycles.
Each waveform is one cycle starting and ending
at -90°.
J Waveforms are in bursts of approximately 100 ms.
I Burst of waveforms start at -90° and end at -90°.
I Pulse waveform.
Pulse varies in width.
Returns to original width.
CH 1: Low to high amplitude bursts of waveforms. I
i Amplitude modulation increases from 0 to
[maximum. I
I
I
2-5
3.1 CONTROLS AND CONNECTORS
The controls and connectors for the Model 166 are shown
in figure 3-1. The listing below discusses each control and
its function.
FREQUENCY/SWEEP START Dial - The main fre
quency control. The setting on this dial multiplied by
the frequency range (FR EO) setting is the basic out
put frequency of· the generator. The dial sets the
sweep start frequency when SWEEP mode (5) is
selected. (The FREQ VERNIER and VCG IN also
affect the generator frequency.) The outer scale has
linear distribution; the inner has logarithmic (2). The
dial index mark lights when power is on.
SECTION 3 OPERATION
LIN/LOG Switch - This switch selects a linear change
in frequency or a logarithmic change in frequency
when sweeping (20), frequency modulating (23) or
using the frequency dial ( 1).
FREQ Range Switch - The 11 position outer switch
selects the generator frequency range, which, when
multiplied by the frequency dial setting ( 1), deter
mines the basic output frequency of the generator.
VERNIER Control - The inner knob allows fine
control over the output frequency. A complete turn
of this vernier is equivalent to approximately one half
of the smallest division on the main frequency dial
(1). When in the full clockwise position (CAL), the
settings on the main dial will be accurate.
Figure 3-1. Controls and Connectors
3-1
0
3-2
HOLD Switch - This switch holds the output at its instantaneous voltage level. Operable in the X .001 through X 10 FREQ ranges (3) only.
GEN MODE Switch - The outer, 8 position switch selects the operating mode of the main generator as follows:
a. CONT Mode - The generator operates continuously as a standard Voltage Controlled Generator (VCG). Frequency output is determined by front panel control settings in conjunction with external control voltage at VCG IN (23).
b. TRIG Mode - The generator will give one complete l;yde \5LarliiiY al 0°) uf uulj.Jui. vvl1en lhe MAN TRIG (6) is pressed or for each cycle of signal applied to TRIG IN (21). A convenient trigger source is the SWEEP OUT signal (17), since the internal sweep operates independently of the main generator.
c. DBL TRIG Mode - As for TRIG mode, except two cycles are given.
d. TRIG HAV Mode - As for TRIG mode, except
the waveform ( I\;, /'y ) starts and ends at -90°,
rather than o0; this is a haverwave. For ~' f"1_J and
Lfl waveforms, this mode is identical to TRIG mode, except the delay between TRIG IN (21) and FUNC OUT (12) is increased.
e ;- ·· 6A~ID--Mode ··..;.;: As fur-ffitfrmode;-excep t ti tat m
the generator will continue to have output for the full time that the MAN TRIG switch (6) is held down or the gate signal at TRIG IN (21) exceeds the gating level set by the TRIG LEVEL control.
f. GATED HAV Mode -As for TRIG HAV mode, except that the generator will continue to have output for the full time that the MAN TRIG switch (6) is held down or the gate signal at TRIG IN (21) exceeds the gating level set by the TRIG
LEVEL control (5i.
g. SWEEP Mode - The generator operates in a sweep mode determined by the SWEEP MODE switch (20).
h. EXT WIDTH Mode - For~. fl_Jandlllwaveforms only. The main generator is disabled and the output frequency and pulse width are dependent on the external signal input at the TRIG IN BNC (21) or the MAN TRIG switch pulse (6).
TTL OUT and FUNC OUT signals are at a de level until triggered. Output, compared to the input, can be normal fL_J or complementary Lfl as set by the WAVEFORM switch (8), or positive (NORM) or negative (INVERT) as set by the NORM/INVERT switch (10).
TRIG LEVEL Control - The inner control is a continuously variable adjustment of the TRIG IN (21) circuitry. When full ccw, approximately a positive going signal of +5V or greater voltage is required for triggering (figure 3-2). In the full cw position, a positive going pulse of approximately -5V or more positive voltage is required for triggering. In the GATED mode, the generator will begin to run continuously at some position of the control cw past 12 o'clock. When using the MAN TRIG, this control must be ccw of the midpoint.
TRIG LEVEL CONTROL
ccw~~~~~~~~~~~~~----cw
+5V ··n·· TRIG LEVEL
TRIGGER SIGNAL MYS+--S€-A~W.-p-p
POSITIVE GOING SIGNAL EXCEEDING
THE TRIG LEVEL SETTING
-5V •• .Jl. •.
Figure 3-2. Minimum Trigger
MAN TRIG Switch - When in any of the trigger modes, pressing this switch furnishes the trigger. When in any of the gate modes, this switch furnishes the gate signal for the duration that it is pressed and held down. The TRIG LEVEL control (5) must be ccw from midpoint for proper MAN TRIG operation.
DC OFFSET Control - This knob adjusts the de base line offset above (+) or below (-) signal ground to ±10 Vdc into open circuit (±5 Vdc into 50!1 load). Waveform plus offset is limited to ±15V open circuit (±7.5V into 50!1 load).
WAVEFORM Selector - The six position outer switch selects the waveform that appears at the FUNC OUT BNC {12i. The waveforms are sine!\;, triangle /\v, ramp ./"'I, square ru, positive going pulse fL_J and positive going complementary pulse Lii.
VCA GAIN Control - When amplitude modulating with a signal at the VCA (AM) IN BNC (22), the inner knob determines the level of modulation by attenuat
ing the input signal.
OUTPUT ATTEN (dB) Control - The four position outer knob attenuates the FUNC OUT waveform and offset (12) from 0 dB (15Vp-p max into 50S1 LOAD)
to -60 dB (15 mV p-p into 50.Q) in 20 dB steps. The inner VERNIER knob varies the attenuation over an additional 0 to approximately 20 dB. Maximum attenuation is 80 dB (1.5 mV p-p into 50.Q).
NORM/INVERT Switch - This switch inverts waveform output from FUNC OUT (12L inversion is about the 0 volt axis of the non-offset waveform.
LEADING EDGE Control - For rt, ILJ and u-1 waveforms only. The outer knob varies the leading edge transition time throughout the range indicated by the TRANSITION TIME switch (14). Transition time should not exceed the pulse width.
TRAILING EDGE Control - For rt, ILJ and lII waveforms only. The inner knob varies the trailing edge transition time throughout the range indicated by the TRANSITION TIME switch (14). Transition time should not exceed the "off" time of the pulse period.
FUNC OUT, 50.Q Connector - This BNC connector is the selected waveform output of the main generator. Output level is 30V p-p maximum into an open circuit or 15V p-p maximum into a 50.Q load.
TTL OUT Connector - This BNC connector is a source of TTL level pulses at the main generator frequency. Pulse width, but neither amplitude nor transition time are controllable. Amplitude is fixed at an inactive level of 0.0 volts and an active level of
approximately 2.4 volts when loaded with 50S1. TTL pulse width is controllable regardless of the waveform selected.
TRANSITION TIME Switch - This seven position switch selects the range of pulse leading and trailing ·edge transition times. Actual in-range time is set by the LEADING EDGE control (11). Affects rt, fl. __ J
and lII waveforms at FUNC OUT (12). It has no effect on TTL and TTL outputs or on 1\;,1vand ~ waveforms. Transition time shouid not exceed the "off" time of the puise period.
TTL OUT Connector - This BNC connector is a source of TTL level pulses at the main generator frequency. Pulse characteristics are the same as for TTL pulses (13) except amplitude is fixed at an inactive
leve! of approximately 2.4 volts and an active level of 0 volts when loaded with 50.Q.
PULSE WIDTH Switch - The outer eight position switch selects the pulse width range. The rt position ensures a 50% duty cycle pulse. The inner VARIABLE knob varies the pulse width throughout the range selected by the outer knob. This knob is inactive when the outer switch is in the ru position. The
-PULSE WIDTH switch affects rt, rl_J and lSI output at FUNC OUT {12) and the TTL (13) and TTL (15) outputs. The l\;,1v and /1 waveforms are not affected. Pulse width cannot exceed 70% of
pulse period.
SWEEP OUT, 600.Q Connector - This BNC connector provides a fixed 0 to nominal +5 volts sawtooth waveform whose period is determined by the SWEEP TIME control (18~; there is no output when SWEEP TIME is OFF. Output also depends on the SWEEP MODE control (20):
Position
SWPSTART
SWPSTOP
CONTSWP
TRIG SWP
SWP HOLD
SWPOUT
ov
Approximately +5V
Sawtooth
OV until triggered, then sawtooth and return to 0 V
OV until triggered, then ramp to +5V and hold for duration of trigger,
then return to OV
SWEEP TIME Switch - The seven position outer knob provides a sweep duration range. The inner VARIABLE knob selects the actual sweep time. An OFF position ensures that the sweep generator is off and has no effect on the frequency of the main gen-erator.
3-3
GCV Out Connector - This BNC connector provides
the Generator Control Voltage, a nominal 0 to +5 volts
proportional to the main generator frequency.
SWEEP MODE Switch - The main generator fre
quency is controlled by the sweep generator when the
GEN MODE switch (5) is in SWEEP position; other
wise, the two generators are independent. The outer
five position switch selects the mode in which the
internal sweep generator affects the main generator.
The sweep start frequency is set by the FREQUENCY
dial ( 1) and the sweep stop frequency is set by the
inner SWEEP STOP knob (20). The sweep modes are:
a. SWP ST ART Mode - The main generator operates
at the freq11enr.y set by the FREQUENCY dial (1)
and in the range set by the FREQ switch ( 3). This
mode is used to set the sweep start frequency.
b. SWP STOP Mode - The main generator operates
at the frequency set by the SWEEP STOP knob
(20) and in the range set by the FREQ switch (3).
This mode is used to set the sweep stop frequency.
c. CONT SWP Mede - The main generator frequency
is swept up from the sweep start frequency to the
sweep stop frequency as preset in the SWP START
mode and SWP STOP mode and in the time deter
mined by the SWEEP TIME switch (18); the signal
immediately drops to the start frequency and
sweeps again.
@· TRIG IN, 1.5 kn Connector - This BNC connector is
de coupled with 1.5 kn, 30 pF input impedance.
Trigger signals must be 1 V p-p or greater but within
the range of ±5V. The TRIG LEVEL control (5) ad
justs the sensitivity of the generator to this input
signal. Trigger signal width must be 25 ns or greater.
Trigger frequency must be less than 25 MHz. The
trigger signal can trigger the main generator and/or
the sweep generator, depending on the mode of
operation selected.
VCA (AM) IN, 3 kn Connector -This BNCconnector
has input impedance of 4.99 to 10 kn depending upon
the VCA GAIN setting (8). With VCA GAIN fully cw,
0 to ±5 volts gives a 0 to 30 volt amplitude change;
5 Vac gives 100% modulation; 10 Vac gives 200%
modulation (suppressed carrier). Increased voltages
are required when the VCA GAIN control is used.
AM signal bandwidth is limited to 10 kHz.
@ VCG (FM) IN, 6 kn Connector - This BNC connector
is the Voltage Controlled Generator signal input, a
3-4
signal that controls the main generator frequency.
With 0 volts in, the main generator frequency is deter
mined by the frequency range selected and the fre
quency dial setting. A positive VCG voltage will in
crease this frequency, and a negative voltage will de
crease the frequency. Operation is limited by the
FREQ range switch setting (3). A 5 volt excursion
will vary the frequency up to 1000:1, linearly or
logarithmically.
POWER Switch - Power is on when this pushbutton
switch is in, and off when extended.
3.2 WAVEFORM TIMING
The relationship among waveforms for different modes is
illustrated in figure 3-3.
3.3 OPERATING PROCEDURE
No preparation of the instrument is required beyond com
pletion of the initial checkout given in paragraph 2.3. It is
recommended that a one-half hour warm-up period be al·
lowed for the associated equipment to reach a stabilized
operating temperature, and for the Model 166 to attain
stated accuracies. The operator should be familiar with the
controls and connectors given in paragraph 3.1 and the
waveform relationships given in figure 3-3.
There are almost unlimited ways to set up the generator
and waveforms that may be obtained. The following sections
desCrlbe-basic--c-onriguraffons anc:rn-ow tcJ" sertnem u-p.
Notice the grouping of controls on the front panel:
a. the waveform and amplitude group
b. the pulse characteristics group
c. the sweep group
d. the frequency and operating mode group
Internally, the sweep group will be used only in sweep
mode. In addition, the sweep generator can be used as an
independent signal source with its own output. This is a
convenient source of trigger and modulating signals for the
main generator. The pulse group is used only for altered
forms of the ~ , f1_J and LJI waveforms.
The setup instructions given in the next paragraphs must
necessarily be general. They are divided for five applications
which can be combined as required:
SELECTED WAVEFORM
TRIGGER SIGNAL
I MODE I BNC
CONT I FUNC OUT
TTL
TRIG FUNC OUT
TTL
I DBL FUNC
I TRIG OUT
TTL
TRIG FUNC HAV OUT
TTL
GATED FUNG OUT
I I
I I TTL
I GATED I FUNC HAV OUT
TTL
CONT FUNG SWEEP OUT
TTL
I
I EXT FUNC I
WIDTH OUT
TTL
OV-
ov_
ov_
OV-
ov_
OV-
OV-
OV-
TRiGGER Lt::Vt::L
I (FULLY CCW)
I
I I
f'v
I
j\ _l_fl
I 11 rl II II _u LJ LJ LJ L_ I I
lN\N\_
I I
f'v ln~------1
ii\ -f
l_fl I
I I I r-, ,--, ,--, 11
_Jj LJ LJ LJ L_ I
NOTE: INVERTED WAVEFORMS ARE INVERTED ABOUT THE av AXIS. TTL WAVEFORMS ARE NOT AFFECTED BY WA VE FORM INVERSION.
1 n n n n n _!_J L__J L_J ~ L _ __J __ I
I
-(\;-------
I
ii\ -¥
l_n
I n n n n _!_J LJ L_J L_J L__ I
I I
U1JlJlJUl I
I I
Ul'------------+--
:n i---'
:_n
I I ,-, r--, ,-, r+--, LJ LJ LJ LJ1 _I __
I I I
ITTJlJlfL
-I
I
I I
:~_n I I
~...____ _ __,___ I I
:_n.___ ___ --'----1
I
~
:_n I I
~UV-
:_1Ln_~~n I
~ I
~'--------'---I
I :u :_n I
I I
~·-1_Jr--1LJ.--l_J~LJr--! :J--LJ~ur--LJiLJ__... I I I I I J
~_JU\_J\j\J 11JlJlJ:lJL
Figure 3-3 Waveform Relationships
3-5
a. Continuous, triggered or gated operation
b. Voltage controlled frequency (VCG) operation
c. Sweep operation
d. Pulse operation
e. Voltage Controlled Amplitude (VCA) operation
3.3.1 Continuous, Triggered and Gated Operation
Operation in these modes is set up using standard waveforms. After getting results with a standard waveform, refer to paragraph 3.3.4 for pulse setup, if desired.
1.
2.
For most accurate results, place the generator in continuous mode and monitor the setup of the controls with an oscilloscope. Connect FUNC OUT to the oscilloscope and sync to this signal. It is best to use an oscilloscope with greater than 250 MHz band width or a sampling oscilloscope. To view the high frequency performance with a real-time scope, use a 50rl, 10: 1 attenuator at the scope input to reduce the capacitive loading due to the scope.
Set the frequency controls for the desired frequency.
3. Select the waveform, attenuation and offset. This completes the setup for continuous mode.
4. If one of the triggered or gated modes is desired, select the mode. If triggering is manual, rQtate the TRIG LEVEL fully ccw. This completes the setup for manual triggering or gating.
5. If an external trigger signal is to be used, connect a qualified trigger source (paragraph 3.1) to the TRIG IN BNC and to the oscilloscope trigger input. Set the scope to trigger on the external signal. Rotate the Model 166 TRIG LEVEL control fully ccw, then rotate cw until the desired triggering occurs.
3.3.2 Voltage Controlled Frequency (VCG) Operation
Set up the controls as given in paragraph 3.3.1 for continuous operation. The frequency selected will be the reference frequency. A voltage at the VCG BNC will cause the frequency to deviate from the reference frequency.
1. For frequency control with positive de inputs at VCG IN, set the dial for a lower limit from which frequency is to be increased.
3-6
2.
3.
For frequency control with negative de inputs at VCG IN, set the dial for an upper limit from which frequency is to be decreased.
For modulation with an ac input at VCG IN, set the dial at the desired center frequency. Do not exceed the maximum dynamic range of the selected frequency range.
Figure 3-4 is a nomograph with examples of the frequency dial effect as a reference for VCG IN voltages. Example 1 shows that with OV VCG input (2nd column), frequency (3rd column) is as determined by the frequency dial setting of 2 (1st column). Example 2 shows that with a positive VCG input, output frequency is increased. Example 3 shows that with a negative VCG input, output frequency is dec1 eased. {Note that the Factor of 50.Q OUI Frequency column must be multiplied by the frequency range in order to give the actual 50Q OUT frequency.) For full 1000: 1 linear mode VCG sweep of the generator frequencies, set the FREQ VERNIER full ccw.
NOTE
The FREQ VERNIER must be rotated full ccw for 1000: 1 linear or logarithmic range.
FACTOR OF FREQUENCY VCG 5onouT
DIAL SETTING VOLTAGE FREQUENCY (5) 5 -5Vl .05 (.005)
-4V
4 =3V .t -2V .... '?I
(.5) ...... ~f\--~ (.05) 3 -1V i;;,-f...~ _ .2
...... - -t-APLE 2 .......... _ ...... ..ov. E~p..
2 -::::...-
+1V 3 (.05) ............ (.5)
'..t2V
+Jv' €'~-<! 4 +4V ....... ~Pt..€'
....... ...... 1 (.005) .05 +5V l> (5)
LINEAR AND (LOGARITHMIC)
Figure 3-4. VCG Voltage-to-Frequency Nomograph
3.3.3 Sweep Operation
1. Set SWEEP MODE to SWP START and adjust the FREQUENCY dial and FREQ range for start sweep frequency.
2. Set SWEEP MODE to SWP STOP. Set SWEEP STOP control for the desired upper frequency.
3. Set GEN MODE switch to SWEEP and SWEEP TIME
switch to the approximate sweep duration desired.
4. Set to CONT SWP mode and sync the oscilloscope
with the SWEEP OUT signal. This completes the
setup for continuous sweeping.
5. If a triggered sweep mode is desired, select TRIG SWP
or SWP HOLD, connect a qualified trigger source
(paragraph 3.1) to the TRIG IN BNC and to the
oscilloscope trigger input. Set the scope to trigger on
the external signal. Rotate the Model 166 TRIG
LEVEL control fully ccw, then rotate cw until the
desired triggering occurs.
3.3.4 Pulse Operation
1.
2.
Set up the controls as given in paragraph 3.3.1 for
continuous operation. For pulse operation, select '1 , fl._j or Ln waveform, normal or inverted
(figure 3-5).
Set the pulse width as desired. Keep in mind that the
pulse width cannot exceed approximately 70% of the
"normal" waveform period. For wider pulses than
those that can be normally obtained, set up the n___J
pulse with the complement of the width that is
desired, then switch to the complement pulse ( UI ). For example, a 95 ns pulse with a 125 ns repetition
rate is desired. The complement of 95 ns is
125 - 95 = 30ns
Set up a 30 ns pulse with a 125 ns repetition rate
and switch to the complement pulse as shown.
WAVEFORM NORM/INVERT SWITCH OUTPUT
ru NORM
WAVEFORM OUTPUT
~1 r-- 30 ns
n___J (Normal) n i ~ 125 ns r-~ 95 ns r-
LJI (Complement) LJ I
3. Set the pulse leading and trailing edges. Pulse transi
tion times are restricted to less than pulse width.
3.3.5 Voltage Controlled Amplitude (VCA) Operation
Set up the controls as given in paragraph 3.3.1 for contin
uous operation. The amplitude selected will be the reference
amplitude. A voltage at the VCA BNC will cause the output
amplitude to deviate from the reference amplitude. The VCA
GAIN control can be used to attenuate the VCA input. For
AM operation, 5V p-p gives 100% amplitude control or
modulation, while 10V p-p gives 200% (suppressed carrier)
modulation.
(With some "pulse width" and
"transition time" selected) REMARKS
Amplitude is arbitrarily one.
ru INVERT 0 --=i------1------\-----/-------} 1 Inversion rotates '1 about 0 axis.
o _j _____ \ ;_ ____ }.-___ } %1 A Oto Vppuise.
a _ -:J [ _____ \ / _ _ _ _ _ _ } 11.1 The complement of 1LJ. I
lLJ NORM
Lil NORM
n_J INVERT O --,- - - - -; - - -7 } % I Inversion rotatesfl_Jabout 0 axis.
UI INVERT O ~ \ - - - - - -, \ - - - - - - } % Inversion rotatesLJlabout 0 axis.
Figure 3-5. Comparison of Available Pulses
3-7
4.1 GENERAL
The circuits summarized in figure 4-1 are placed on two circuit boards in the generator. All circuits outside the dotted lines of the Sweep and Transition Time board (-0629) are on the Main board (-0628). The manual controls and connectors are mounted on the front panel. The power supply, which is not shown, is located on the rear panel and Main board.
4.2 BASIC WAVE FORM DEVELOPMENT
The heart of the generator (the bold path in figure 4-1) is a triangle and square ~ave generator. The triangle waves are developed by charging a capacitor with constant curr~J11$ tha_!.}1_rn_~a~~e_r~~ately reversed~-~ po_t~r,:ity. ---The. pdiarit; reversal is caused ·by--~dflp-flop.ci~cuit, or hysteresis switch, that in turn produces the square waves. The flip-flop changes states, causing the constant current to. change polarity, upon detecting amplitude limits of the triangle waveforms.
The VCG dial buffer ~urns the currents from the frequency dial, frequency vernier, VCG IN connector and the sweep circuit. The VCG dial buffer is an inverting ampiifier whose output voltage can be applied directly to the GCV amplifier or through the log converter to the GCV amplifier. The output voltage of the GCV amplifier controls the positive and negative current sources. This voltage is also present at the GCV OUT connector. For all waveforms except the ramp the currents from the two current sources are equal and linearly (logarithmically in log mode) proportional to the voltage of the VCG dial buffer output in linear (log) operation. The diode gate, which is controlled by the hysteresis switch, is used to switch the positive or negative current to the integrating capacitor selected by the frequency multiplier. If the positive current is switched into the integrating capacitor, the voltage across the capacitor will rise linearly to generate the triangle rise transition. If the current is negative, the voltage across the integrating capacitor will fall linearly to produce the fall transition.
The triangle amplifier is a unity gain amplifier whose Oljtp_u.t.. i.s...Jed to the hysteresisswitc,h. The hysteresis switch has .tw~~-olt~-g~- limit-poin.ts (app·~;)cimatety ±1.25V) at its input.
SECTION 4 CIRCUIT DESCRIPTION
During the time the output voltage of the triangle amplifier is rising, the output voltage of the hysteresis switch is positive, but when the output voltage of the triangle reaches +1.25V, it triggers the hysteresis switch, causing the output to switch negative. Once the con.trot voltage into the diode gate becomes negative, it will switch the positive current out and switch the negative current in to the integrating capacitor, so that the voltage across the capacitor will reverse, starting a linear decrease of the triangle wave. When the decreasing voltage reaches -1.25V, the output of the hysteresis switch will switch back to positive, reversing the process. This action generates the triangle waveform as shown in figure 4-2. Since the output of the hysteresis switch is a square wave, the result is simultaneous generation of a square wave and a triangle wave at the same frequency.
The output frequency is. determined .by. the magnitude of the capacitor selected by the frequency multiplier and magnitude of the current sources. Since the current sources are linearly proportional to the control voltage of the VCG circuit, the output frequency will also be linearly proportional to the control voltage. The relations become logarithmic if the log mode of operation is chosen. The capacitance multiplier is used to sink a precise amount of the current supplied to the integrating capacitor on the low frequency ranges.
4.3 WAVE SHAPE ANDAMPLIFICATiON
The output of the hysteresis switch is-shifted to MECL level and fed to the pulse width circuitry. The pulse width is determined by varying the RC time constant of an MECL one-shot. The output of the pulse width circuit feeds the TTL and TTL buffer and the rise/fall circuit. The TTL and TTL buffer circuit provides an approximate 0 to 2.4V output into 50 ohm load. The rise/fall circuit controls the transition time via selected RC networks, then returns the shaped square wave to the square wave clipper on the main board. When a square or pulse mode is selected, this clipper is acti· vated to supply the signal to a pair of transistors which convert the single ended pulse to the differential input required by the multiplier.
The triangle wave from the triangle amplifier is coupled to another pair of transistors and the sine converter. This pair of transistors are turned on when triangle or ramp are selected
4-1
IN
TRIG LEVEL
-~+ .,.
EXTERNAL WIDTH
TRIG
:'
- TRIGGER 1-+l CONTROL . SQUARING I LLOGIC
~~~~~~~~~~~~~--1~~~~~
~
VCG (FM)
IN 6k!"°2
~ FREQ
FREQ VERNIER
LOG CONVERTER
Figure 4-1. Generator Block Diagram
4-2
LIN
L
SWEEP & TRANS TIME BD (-~)
PULSE WIDTH
TTL&TTL BUFFER
RISE/FALL
r r 1 LEAD TRAIL EDGE EDGE
I _J I
v
POSITIVE
HYSTERESIS--------.. ---------•--i SWITCH CURRENT ~~--~~~-.
___ W_!.LFiC_L
NEGATIVE
DIODE GATE
CURRENT 1--~~~~~-'
SOURCE
MAIN BO (-0628)
I HOLD
CAPACITOR MULTIPLIER
ru
SINE CONVERTER
v
MULTIPLIER
+
DC OFFSET
ATTEN
TTL OUT
(50rll
~ ~
TTL OUT
(5M2l
SWEEP OUT
(600!"°21
~
FUNC OUT
(50!"°2)
~
GCV OUT
(600!"°2)
~
+ 1 .25V - - - - - - -
A,B
-1.25V
A
HYSTERESIS SWITCH
L I I I I
B
c +
2
_
2
v I I I I I -2.2V
Figure 4-2. Basic Generator and Timing Diagram
and convert the single ended output to the differential input
needed by the multiplier. The output of the sine converter
is coupled through a similar pair of transistors before reach
ing the multiplier.
The amplitude vernier voltage and the VCA IN voltage are
summed in the summing amplifier whose output is used to
control the multipliers output amplitude. The phase of the
output waveform is determined by the polarity of this
voltage with the NORM/INVERT switch controlling the polarity of the de from the amplitude vernier. In addition
to being coupled to the modulating input of the multiplier,
the output of the summing amplifier is coupled to another
de amplifier which keeps the pre-amplifier summing junction
at the appropriate level when normal or complimentary
pulse is selected.
A current mirror is used to convert the multiplier differen
tial output to single ended output before it is applied to the
inverting pre-amplifier. The output of the pre-amplifier pro
vides an input to the summing junction of the output ampli
fier. The de voltage from the DC OFFSET switch and
potentiometer are also added in at the summing junction.
The signal is again inverted and amplified before it is applied
to the attenuator. The attenuator provides 60 dB of attenu
ation in three 20 dB steps. Maximum output at 0 dB is 15V
into a 50 ohm load. Arljustment between steps is provided
by the vernier.
4.4 TRIGGERED AND GATED MODES
In the triggered and gated modes, the forward biased trigger
diode sinks the current from the positive current source,
thereby preventing the integrating capacitor from charging
and, therefore, the generator from oscillating. The trigger
pulse resets a flip-flop which reverse biases the diode, so the
capacitor begins to charge. The hysteresis switch transition,
which occurs when the triangle wave reaches its negative
peak, clocks the flip-flop back to the original state, which
prevents the voltage at the integrating capacitor from rising
above ground. In the haver modes, this voltage is held at the
negative triangle peak. In gated mode, the falling edge of
the trig in signal (the gating signal) releases the flip-flop to
clock on next hysteresis switch transition occurring at a
negative triangle peak. This forward biases the trigger diode
so the voltage at the integrating capacitor may not rise above
the set voltage (ground or the minus peak). The double trig
ger is accomplished by a series of flip-flops which "count"
two negative triangle peak transitions of the hysteresis switch.
In EXT WIDTH mode, the signai to be shaped is appiied to
TRIG IN where it is squared in the trigger squaring circuit
before being coupled to the rise/fall circuit, from which
point it follows the normal square wave path. The generator
must be set to square wave of pulse to obtain an output.
4.5 SWEEP GENERATOR MODES
The sweep generator is an independent generator with a 0
to +5V ramp out at the sweep out connector. It will drive
up to 600 ohm impedance and can be used to externally
trigger, VCG or VCA the main generator by connecting
sweep out to the appropriate front panel connector.
The sweep generator can also be connected to the main
generator internally by selecting SWEEP on the GEN MODE
switch. The basic sweep generator consists of the current
source, FET input amplifier, clamping circuit and hysteresis
switch.
The current source charges a capacitor with a constant cur
rent which produces a voltage ramp across the capacitor.
The ramp is buffered by the FET amplifier and applied to
the hysteresis switch. When the ramp reaches the threshold
voltage of the hysteresis switch, it changes state a11d dis
charges the capacitor very quickly through the discharge
diode. The clamping circuit clamps the peaks of the ramp
to precise levels which assume 1000: 1 sweep control.
As the output of the sweep generator is internally connected
to the input of the VCG dial buffer, it controls the fre
quency of the generator.
4-3
In SWP START mode, the sweep generator is held at its OV
peak so that the start frequency may be set with the combi
nation of the frequency dial, frequency range and vernier.
In SWP STOP mode, the sweep generator is held at its +5V
peak, so that the portion of the voltage to reach the VCG
dial buffer may be set in SWEEP STOP mode which deter
mines the maximum frequency. In CONT SWP mode, the
main generator is swept between the frequency limits set by
sweep start and stop.
In TRIG SWP mode, the main generator oscillates at the
start frequency until the trigger input triggers the sweep
4-4
generator. At the end of one ramp, the main generator re
turns to the start frequency and waits for the next trigger
pulse.
In SWP HOLD mode, the main generator oscillates at the
start frequency as long as the trigger input signal is below
the trigger level threshold. As the threshold is crossed, the
main generator is swept up to stop frequency, where it will
remain until the trigger input falls below the threshold, at
which time the main generator returns to the start frequency.
5.1 FACTORY REPAIR 5.3 CALIBRATION
SECTION 5 CALIBRATION
Wavetek maintains a factory repair department for those
customers not possessing the necessary personnel or test equipment to maintain the instrument. If an instrument is returned to the factory for calibration or repair, a detailed description of the specific problem should be attached to minimize turnaround time.
Perform calibration according to table 5-1. If performing a partial calibration, check previous settings and adjustments for applicability. See figures 5-1, 5-2 and 5-3 for calibration point location.
1. Use son cable for all instrument connections. 5.2 REQUIRED TEST EQUIPMENT
DVM ....... Millivolt de measurement (0.1 % accuracy) 2. Allow the instrument to warm up at least 30 minutes for the final calibration. Keep the instrument covers
on to maintain heat. Remove covers only to make adjustments or measurements.
Differential Osci!!oscope, Dual Channel 500 MHz bandwidth
Distortion Analyzer . . . . . . . . . . . . . . . . . . . 600 kHz Frequency Counter .......... 50 MHz (0.1 % accuracy)
Table 5-1. Model 166 Calibration Chart
Calibration Step Check Tester Point Control Setting Adjust Desired Results
1 Power DVM or -0628-TP1 FREQ: X 1K -0645-
+12 Vdc ±50 mV R16 - Supplies Differential FREQUENCY:5
2 Scope -0628-TP2 FREQ VERNIER: CAL -12Vdc±100mV
-;i I GEN MODE: CONT
I -0628-TP3 DC OFFSET: OFF +22Vdc±400 mV - WAVEFORM:~
4 -0628-TP4 OUTPUT ATTEN: 0 -22 V de ±400 mV
- OUTPUT VERNIER:
5 -0628-TP5 12 o'clock -0645-
+5.2Vdc±20mV R24
- SWEEP MODE:
CONTSWP SWEEP TIME: 10s I 1s PULSE WIDTH:~ TRANSITION TIME: 7 ns I 50 ns
I "LEADING EDGE: F ult ccw1 I I
I !TRAILING EOOE: Full ccw LIN/LOG: LIN
I NORM/INVERT: NORN I
Remarks
All measurements are ref-erenced to ground.
I
I I i I
5-1
Step Check Tester
6 Hysteresis Scope Switch
I Balance I I
I i
I I i i
! I
i I !
I ! I l
1 J f1 Am- I I plitude Zero
8 I ty Am- , DVM I plitude Zero j
9 Multiplier Scope Null
10 i Time Sym! metry I I
,--,- .. i I\; Dis-.i .
· 1 tort1on
!
I Distortion i J Analyzer i
- - -i-1\-- -- ·, 1 2 1 · v Offset ! Scope
13
14
15
16
5-2
I Shift i
I 'Y Offset l Shift I
I\; Amplitude
I
Preamp I Differential Zero Scope
I I I
I Output I Amplifier I Zero I
I I !
Table 5-1. Model 166 Calibration Chart (Continued)
Calibration Point Control Setting Adjust Desired Results Remarks
-0628-TP9 -0628· 1 '1 Offset R150 OV±100mV
I I I i I I
I I
I I I
i I I I
l-0628-TP8 WAVEFORM: :..ri::t -0629- ~Offset I I
-0628-TP6 GEN MODE: TRIG
FUNC OUT GEN MODE: CONT WAVEFORM: I\; 10UTPUT VERNIER: J Full ccw
R31 -~ OV ±50 mV
-0628- 0 Vdc ±5 mV
jR86 I
1
-0628- As near de as ,R330, possible IR334 I
WAVEFORM:~ 1-0628-!Time symmetry isee figure 5-4 for equip-1 j
Set output for 10V p-p IR46 !within ±0.1% iment setup. Set scope to
WAVEFORM: I\;
I j20 µs/div.
j -0628- IMinimum sine R 103, I distortion
!R142 I
JTrim R216, R226 and I R238forlowest distortion I (typically 0.15%).
- . i--------- ---;---------·-·-----------·------· -. ·---~------- -·-·· -- -·-··--· ··-- ···-· - -
1
-0628- i No de shift be- 1' Neglect the de offset if R241 !tween normal any. Amplitude may be
I J
-----------1 and inverted I.different between normal WAVEFORM: 'V -0628-joutput and inverted.
R210 I I
WAVEFORM: Switch between I\; and ty
-0628 '\J and 'V 1
. Verify or retrim R212. Select peaks are within ,
R212 ±50 mV I I !
I I -0628-TP7 WAVEFORM: I\; -0628-1 Positive and neg- j
R308 I ative peak volt- I ages are within I 15 mV of each I other. I
FUNC OUT
I I
-0628- Positive and neg- I . I
I R248 I ative peak_vo.lt- I
I
,· 1
. ages are within i
1
20 mV of each I . . other.
I Step I Check
I~ p . 17 'l..J OSl-
tive Peak
18 I f"l.J Offset Shift
I
19 ru Normal/Inverted
I Amplitude
20 [output (mp!itude
I
21 Trigger Baseline
22 jHaver Baseline
23 VCG Null
I
I
24 I 1000: 1 Time Symmetry
2.5 Symmetry at 5X1 kHz
27 Symmetry at 0.5 X 10 MHz
I I I Tester
fl Differentiai Scope
I 1scope
I
Table 5-1. Model 166 Calibration Chart (Continued)
I Calibration
I Point I Control Setting
'1' FUNC OUT tWAVEFORM: ~w1tcn between 1\;, and f"l.J
I
!Adjust r·•;red Resulu I Remarks
f -0628- Positive peaks of '1 Verify or retrim R212. R 198 f"l.J to !\; are
within 50 mV I
WAVEFORM: nu
1
-0628- INo de shift be- !Amplitude can be differ
R203 ltween normal lent between normal and and inverted out- inverted output. put (or match to the negative 1\; peak)
WAVEFORM: ru -0628- Zero levels are
Switch between NORM R297 within 50 mV
and INVERT
!WAVEFORM:!\; OUTPUT VERNIER: Full cw
-0628-1 Peak-to-peak R254 voltages are
I 15v ±150 mV
WAVEFORM:!\.; -0628- 0 Vdc ±20 mV
GEN MODE: GATED R86
Neglect the de offset if any.
I GEN MODE: TRIG HAV I -0628- IBaselines are at !Set the trigger level con-Connect SWEEP OUT I · to TRIG IN R 178 the same level of jtrol to obtain a burst of
SWEEP TIME: 10 ms I ms the negative peak !\.; signal.
GEN MODE: CONT -0628- Less than 1%
FREQ: X 100K R4 frequency shift
FREQUENCY: Full cw I !while opening
!
WAVEFORM: nu I 11aVrC,dGsh
1
1uN-rtti0
ng Set output to 1 OV p-p
I ground
LIN/LOG: LOG
LIN/LOG: LIN FREQ:X1K FREQUENCY:5
~FREQ: X 1M
I FREQUENCY: 0.5
1-0628- Each half cycle
1
1 R34, f"l.J is 1.2 ms R59 and symmetry
is< 1% I
I -0628- Time symmetry R46 within 0.1%
! -0628- Tme symmetry I I R47 within 0.2%
FREQ: X 10M -0628- Time symmetry R45 must be installed for
R45 < 1% unit to oscillate on X 10M (trim) range. Verify or retrim.
5-3
Step Check Tester
28 Frequency Frequency Counter
- I
30
31
33
34 , Low Fre- I Scope
jquency I I !Symmetry I
I 35 Low Fre- I Counter
quency
36 Logarithmic!
j 38
39
Frequency I .. ---·--·-·· i
I
High Fre- Sampling
1quency
1 Scope
Waveform
40 Sweep Scope Ramp Posi-tive Peak
41 Sweep
Ramp Zero I Peak
5-4
Table 5-1. Model 166 Calibration Chart (Continued)
Calibration Point
TTL OUT
I Control Setting
! IFREQ:X1K
1 FREQUENCY: 5 I
I I
I I FREQ: x 100
! 'FREQ:X10M
I FREQ: x 1M I
FREQ: X 100K
I
I FREQ: x lOK
!
FUNC OUT! FREQ: X 10 I I FREQUENCY: 0.5 I I I I I TTL OUT I FREQUENCY: 5 I . I
I !
I . Ad JU St Desired Results
-0628- 5 kHz ±10 Hz
R13
1
-0628-1500 Hz ±1 Hz R18
I Remarks I I
l jR 13 affects frequency jcalibration in all frequen-I jcy ranges. I
-0628- 50MHz±500kHz IC22/23 may be added to l
C24 lower frequency.
::~8- 5 MHz ± 10 kHz IT rim C27 ifR 15 in stops.
-0628- 500 kHz ±1 kHz !Trim C25 if R16 in stops.
I R16 I I
1
-0628- 50 kHz ±100 Hz I Trim R117 if R17 in
1 R17 I stops.
, -0628- Time symmetry
I R 188 I within 0.2%
I l -0628-150 Hz ±0.2 Hz R182 I (20 ms ±40 µs)
!
iTrim R181 if R182 in I 1stops.
I I FREQUENCY: 1 (Lin -0628-j 1.99 kHz ±40 Hzlcross Reference of Dial ! scale) R50 l lDial (lin) Dial (log)
-! FREQ:-X-WOK - ---1- -r· ----------l 0 .005 I I LIN/LOG: LOG i I 1 .020 I I I I 1.67 .050 I
I I I FREQUENCY: 4 -0628-1125.6 kHz 2 .079 I I
I R20 I ±2.5 kHz 3 .316 I
I
I
i 3.33 .500 Repeat steps 24, 36
I 4 1.26
I and 37 several times 5 5.00
I
FUNC OUT WAVEFORM: 'l.J -0628- Minimum rise/
I I LIN/LOG: LIN R266, 1 fall time and
I I I FREQ: X 10M R285 abberation I
FREQUENCY: 0.6 R351
SWP OUT SWEEP MODE: CONT -0629- Positive peak (no load) SWP R110 just starts to
SWEEP TIME: flatten 100 ms I 10 ms SWEEP TIME VARI- -0629- Zero peak just
I ABLE: Full cw I R107 starts to round
I
I
42 Sweep
1 Tester
I Scope
Ramp Start
43 Final Cali-bration (optional)
I I
Table 5-1. Model 166 Calibration Chart (Continued)
Calibration I I Point I Control Setting
I swP ouT I swi=i::p MODE· swP ..........
I Adju.J Desired Results I
I 06291 OV (0 to 5 mv)I - -
Remarks
I
(no load) START
Close covers and warm up for 1 hour; repeat step 11, then step 28.
R62
R24 +5.2V ADJ
Ci S
Figure 5-1. Power Supply (-0645) Calibration Points
ll
Sine distortion calibra-ti on wil I affect all fre-quency calibration. Ad-justing Ri3 wili restore
the frequency calibration.
.L ~ i ~ ~iyy
[1
EIO E9
5-5
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Figure 5-2. Main Board (-0628) Calibration Points
L-9
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5-8
MODEL 166
TTL
FUNC OUT
NOTE
Set scope to normal external trigger. Use alternate or chop vertical mode. Set scope time so that one cycle just fills the screen. Using X 10 multip
6.1 INTRODUCTION
Familiarize yourself with the Model 166 by reviewing the
operating procedures as well as the circuit descriptions.
Successful fault isolation depends upon knowiedge of the
correct instrument operation. The physical arrangement of
the instrument and component listings are given in Section
7.
Table 6-1 lists six basic problem areas and possible causes
and corrections to problems in those areas.
PROBLEM AREAS
Power Supply
Output Waveform
Time Symmetry
Frequency Accuracy
Generator Mode
Sweep Circuit
Check points, expected values and component functions are
given in tables 6-2 through 6-10, the troubleshooting guides.
SECTION 6 TROUBLESHOOTING
TROUBLESHOOTING GUIDES
Power Amplifier
AM and Preamp
Waveform Switching
Hysteresis Switch
Capacitance Multiplier
VCG Current Source
Transition Time
Sweep Circuit
6.2 ACCESS
For access to the Power Supply board (-0645) and Main
board (-0628), remove the top cover. For access to the
Sweep and Transition Time board (-0629), remove the
bottom cover.
6.3 TEST EQUIPMENT
Test equipment are listed in paragraph 5.2.
Table 6-1. Troubleshooting
Problem Definition
POWER SUPPLY PROBLEM
1. Blown fuse 1. AC line voltage is not
properly set.
2. Short circuit if fuse blows
again after replacement.
13. Fuse blows again or voltage
output at J 1 is not correct.
I
Possible Cause/Correction
Measure the ac line voltage and check for proper selection of
line voltage in the unit. Refer to paragraph 2.2.1 for selection
procedure.
6-1
Table 6-1. Troubleshooting (Continued)
Problem Definition
4. Shortisnotfoundinthe regulator.
I 15. If voltage output at J1 is
I normal, the short circuit is in main board or sweep
I board.
2. Power regulator 1. Unplug and check voltage at J1 on power supply board. If voltage is not normal, pro-ceed to the followinq steps.
I 2. +5.2V is normal, but all
I ±12V, ±24V supplies are I abnormal.
3. Both -12V and -22V are
I abnormal.
I 14. Only +22V, -22V or +5.2V I is abnormal.
I 5. All regulator outputs are
abnormal.
3. Power supply L Unplug and check voltage at
I " voltage below J1 on power supply board. normal If voltage is normal, the
problem is in main circuit board or sweep board. Other-wise, refer to power regulator problem.
2. Both ±22V supplies below normal.
OUTPUT WAVEFORM PROBLEM
1 . No output waveform at FUNC OUT and TTL OUT
2. No output waveform at FUNC OUT, but TTL OUT is normal
6-2
Main generator is not running.
Possible Cause/Correction
i Check for short circuit of transformer, power switch or defec-1 tive CR1 - CR8, CR10 or CR11.
I Ch eek for short circuit between collector of 01, 05, 012 or j 016 to chassis and also IC3.
I in most cases, short circuits in main board and sweep board do I not cause blown fuses, unless the current limiting circuit in the I power supply regulator has also failed. 03, 07, 011 and 015 I
I in power supply board are the current limiting device.
I
Problem is in the +12 volt regulator; check for defective 01 -04, IC1, CR9 and the associated circuitry.
Problem is in the -12V regulator; check for defective 09 -012, IC4 and the associated circuitry.
Check the regulator in which the output voltage is abnormal.
Check line voltage and proper selection of line voltage. Refer to paragraph 2.2.1 for line voltage selection.
I
Check ~or ~efective transformer and loose wiring in the primary c1rcu1t.
t Overloading the +12V supply wiii cause aii ±12V and ±22V supplies to be low. Overloading the -12V supply will cause the -22V supply to be low.
Isolate the power supply to the sweep board by unplugging J2 on sweep board.
Check for defective transistors 045 - 047 and 049 - 051 in power amplifier.
Ensure power supply voltages are normal and switches and controls are set properly. Triangle amplifier, hysteresis switch or current source is malfunctioning. Refer to troubleshooting tables 6-5, 6-6, and 6-8.
Problem in power amplifier, preamplifier or the AM circuit, Refer to troubleshooting tables 6-2 and 6-3.
Problem
,// 3. No square waveform
at FUNC OUT
4. No sine waveform output
5. Distorted sine wave
form below 100 kHz.
Table 6-1. Troubleshooting (Continued)
Definition Possible Cause/Correction
1. TTL OUT is normal, rii Check for defective 034, 035, CR43 - CR46 and associated
I is seen at TP8 on main board, I circuitry,
I
I 2. TTL OUT is norma1, 1L Connector P15 is not plugged in.
I is not seen at TP8 on main
board.
3. rii output is normal, but no pulse width control.
4. Also no TTL out. Check
for ± 2.2V ~ at emitter
Transition time circuit is malfunctioning; check 01 - 06 and
associated circuitry on sweep board.
Transition time amplifier is malfunctioning; check 07 - 010
on sweep board.
Check pulse width circuit, U5 and 018 - 020 on sweep board.
of 022 to ensure the triangle
generator loop is functioning. 1
If not refer to tables 6-5, 1
1 6-6, and 6-8.
Check the continuity of the 1
1
square wave path to locate
the defective components.
Starting from main board
pins U and 13 of 1J11), to - '~ pins 14 and 15 of U11 1 through connector PIB,to
J16 on the sweep board. Then on the sweep board,
pins 6 and 7 of U3, to pins
2 and 3 of U4 if 1.J is selected, or pin 6 and 2 of U5 if _n_ is selected.
Al! other waveforms are normal. Check sine amplifier 038 and 039 on main board.
1. Time symmetry of ~ is
not 50% ± 0.5%.
2. Nonlinear or distorted "\; .
3. Defective sine converter
4. Defective X-Y multiplier
circuit.
I I
I Square wave time symmetry is not calibrated correctly.
I Refer to TIME SYMMETRY PROBLEM.
I ! If the edge of the triangle is nonlinear at all frequency
II ranges, troubleshoot the VCG current source circuit
I
(table 6-8).
Check for defective 015 and CR7 to CR11. If the peak
I of the triangle is distorted, check for defective range capa-
1 citators C22 to C31 .
I j Check for defective CR47 to CR61.
Check for defective U18, 052 and 053.
6-3
Table 6-1. Troubleshooting (Continued)
Problem Definition
6. Sine distortion out o Usually square wave will show specification at frequencies above 100 kHz.
7. Transition time problem.
8. No TTL and TTL output.
9. Excess of waveform rol I off at high frequency
10. Drooping on square wave ( ~ not square)
11. Nonlinear triangle waveform
up distorted or with slow rise/ fall times.
1. Excess rolloff shown at emitter of 063.
2. Only sine waveform rolloff excess.
3. Otherwise.
Occurs at only one frequency range.
2. Occurs at all frequencies and gets worse at bottom of frequency dial.
TIME SYMMETRY PROBLEM
Waveform time symmetry is off and cannot be calibrated to within specifications
1 . Al I frequencies.
2. Frequency ranges X 10 and and below.
FREQUENCY ACCURACY PROBLEM
Frequency out of specification
6-4
11. Out of specification at all
I I I
I ,2.
I
ranges.
Out of specification at X 1 OK range and up,
Possible Cause/Correction
Check preamplifier 054 - 063, or power amplifier 042 - 051. Check for defective capacitors in the circuit.
Check transition time circuit, 01 - 06, on sweep board.
I Check for defective U3, 021 - 023, on sweep board.
Check for defective C126, C127, C133, C135, C145 and other frequency compensation components in this area, by connecting a capacitor in parallel with each capacitor.
C86 is open or C88 has wrong value on main board.
Check for defective capacitor in the power amplifier.
Check for defective C126 or C127 on main board.
I Check for defective timing capacitors C22 - C31 of the associ-1 ated range.
Check for defective 015 and CR7 - CR11.
I Usually due to the malfunctioning of the VCG current source circuit, U3 - U7, on main board. Check for leakage current at gate of 02 - 05, 07, 09 and 011. check for excess source current at input of U3 - U7.
Capacitance multiplier is malfunctioning. Check for defective U13 - U14 on main circuit board.
I Mismatched dia! and potentiometer {R 1 ). Ensure that the number on the back of the dial matches the number on the potentiometer.
1 Check for defective components in the VCG current source, Ul - U7 and 02 - 012 on main board.
Check for defective components C35, C36, C39, C42 - C48,
IC53, C68, R97 - R99, R109, R116 and R137 - R139 on the main board.
Table 6-1. Troubleshooting (Continued)
Problem Definition
3. Out of specification at I X .001 Hz to X 10M. I 14. Frequency problem when
j LOG is selected.
GENERATOR MODE PROBLEM
1. Generator cannot be 1. Trigger sweep mode is ok. triggered or gated
2. Trigger sweep mode is not operating.
2. Triggered or gated mode ok, but no triggered haver-waveform
3. No frequency sweep 1. No sweep signal at SWEEP -~·<-··"-' OUT.
2. SWEEP OUT is normal.
I
Possible Cause/Correction
Check for defective U13- U14 and R185, R189 - R195 on main board.
I Check for defective U2 and 01 on main board.
!
Check for defective 030 - 033, U 15, CR2 and the associated circuitry on main board. Troubleshoot using figure 6-1.
Check for defective 026, 027 and the associated circuitry on main board.
Check for defective SW2-B, CR42 and R 178 on main board.
Sweep circuit is malfunctioning. Check for defective U 1, U2, U6, 011 - 017 on sweep board.
Check for loose wire connection between sweep board and main board.
I Check for defective SW2-A on main board or R66 on sweep board.
SWEEP CIRCUIT PROBLEM (Unless otherwise specified, components referred to are on the sweep board)
1. No signal at SWEEP OUT
2. Sweep signal runs continuously at TRIG SWP and SWP HOLD
3. TRIG SWP and SWP HOLD are not operating
1. Sweep signal is seen at pin 6
I of U1.
2. No sweep signal is seen at pin 6 of U1.
Sweep mode control logic problem.
1. Manual trigger switch has no effect.
2. Cannot be triggered by MAN TRIG or external signal at TRIG IN.
Check for defective U2, CR28 and CR29.
I Refer to table 6-10.
I Check for defective CR53 - CR60 and SW3-B.
Check for defective MAN TRIG switch and U9 on main board.
I Check for defective 026 and 027 on main board and 026 and I CR55 - CR60 on sweep board.
I
6-5
Test Point
TRIG IN
Pin 13, 15 of U10 ECL
Pin 15 of U12 ECL
Pin 9 of U15 ECL
Pin 15 of U15 ECL
t-2.5V Collector of 033 0
--1.25V
Junction of CR3 and CR6 +2.5V -2.5V
+2.5V Junction of CR4 and CR5 -2.5V
Emitter of 019 + 1.25V --1.25V
Mode ............. ···-············ ,.-···············------····-·-----·------·--·········-·--··--------·········---···--·-·---··-,-~--·----·--- ---·-----~----------
Continuous Triggered Gated Gated Haversine
--~- -~--r~- -~-L_ __ J l.._ __ ...1...I_-_----'I _Jl ______ _ L ___ _._I __ _ L ___ ....... I __
JLSLJLJLr _n__ __
'~-----1 _J I..____
UlSLf1Jl_ --u-- -u~ --u-uuLJLSlSlJl_ -1LJ--- ---I'LJl__JLJ-~
~--Av-- ~A/v--~ ·-···-·--··-·-··-·--------.. ----------·-·-----·-··· ----··-···-··-----------··----·-·- -·-···-------- -----.. ----·-···--·-"------------------·-----····-············-------------- -------- --------'---
Figure 6-1. Generator Mode Timing Diagram
Test Point
Junction R279 and R281.
Junction C92 and C93
Emitter of 063
040-043
Base of 044 and emitter of 045
Base of 048 and emitter of 049
046 and 047
050 and 051
C92, C93, C96-C99, C109, C110, R266-R268 and R284-R286
Test Point
Emitter of 063
057-060
Junction of C132 and C136
Emitter of 061
Emitter of 062
C132-C137, C139-C140 and R351
U18
Pins 6 and 12 of U18
054-056
C126 and C127
Pins 2 and 3 of U18
Pin 10 of U18
U16andU17
Test Point
038 and 039
036 and 037
034 and 035
Junction of CR43 and CR45
Junction of CR44 and CR46
Base of 037
Base of 038
CR47-CR61
I
Table 6-2. Power Amplifier Troubleshooting Guide
Observation
Power amplifier output: 0 to 30 Vp-p signal.
Summing juction: 0 V with less than 2 Vac transient.
Preamp output: 0 to 4 Vp-p signal, inverted from power amplifier output
De biasing circuit for power amplifier.
+19 Vdc.
-20 Vdc.
Slow rise time if one of the transistors is open
Slow fall time if one of the transistors is open
These components affect the power amplifier frequency response the most.
Table 6-3. AM and Preamp Troubleshooting Guide
I Preamp output: 0 - 3 Vp-p signal.
Observation
De bias circuit for the preamp.
Summing junction, +1.8 Vdc typically.
+5.5 Vdc.
-5.5 Vdc.
I Frequency compensation components.
AM modulator.
AM current output. Out of phase with each other.
I Current mirror circuit: sums current from pin 12 to pin 6.
I Excess drooping of square wave if defective.
I Differential signal input: -4.5 Vdc level.
I Amplitude control input: ±. 200 mV.
i Amplitude control amplifiers. I
Table 6-4. Waveform Switching Troubleshooting Guide
'\.; amplifier and switch.
"y ,,,/1 amplifier and switch.
~, L__Jl , WI amplifier and switch
.± 1.5 V ~approximately
±0.5 v~.
± 1.25 v "v. ± 0.4V1'V approximately.
Sine converter diodes. Matched set.
Observation
6-7
Test Point
Base of 015
Emitter of 019
Base of 016
RS6
015 and 017
01S and 019
Test Point
Junction of R 101 and R 136
Pint 1 of US
Pin 4 of US
Base of 023 and 024
023
024
Emitter of 022
Emitter of 021
Pin 3 and 9 of US
C70 and C42-C44
C45-C4S
C71, C6S, C70 and C48
Capacitance multiplier
Junction of R 195 and CSO
Pin 6 of U13
Pin 6 of U14 (Dial at 5)
Pin 6 of U14 (Varies with Frequency)
6-8
Table 6-5. Triangle Amplifier Troubleshooting Guide
± 1.25 V ~(input).
± 1.25 V "v (output).
-9 Vdc. ---·
For amplifier offset calibration.
Observation
Matched for V GS. 017 sets the bias current for 015.
Matched for VBE. Excess offset between input and output of the amplifier may be due to defective or mismatched 015 and 017, or 01S and 019.
Table 6-6. Hysteresis Switch Troubleshooting Guide
± 1.25 v "v . Negative peak detector input.
Positive oeak detector inout.
+6 Vdc with 1 .4 V ~ .
Observation
023 on (collector + 2V) when "v going positive. Off (collector - 2.5V) when "v going negative.
On/off cycle inverts from 023.
± 2.2 v ri . 2.5 Vp-p "v . -3 Vdc.
Negative peak compensation.
Positive peak compensation.
Compensation for frequency above 10 MHz.
Table 6-7. Capacitance Multiplier Troubleshooting Guide
Used only at frequency ranges X.001 to X10.
+1.25V
-1.25V
+7.5V
-7.5V
+3.75V
-3.75V
+3.75V
-3.75V
Test Point
Pin 6 of U1
Pin 6 of U3
Gate of 02
Pin 2 of U4
Pins 2 and 3 of U6
Emitter of 08
Pin 6 of U4
Pin 6 of U6
Pin 2 of U5
Pin 2 and 3 of U7
Emitter of 010
U2 and 01
Emitter of 024
Base of 013
Pins 9 and 13 of U6
026
CR53-CR60
Table 6-8. Current Source Troubleshooting Guide
I Observation
0 to -5.6 V. Varies with frequency.
0 to +5.6 V.
I +12 V (02 is on) except when ramp waveform ( .// ) is selected; then voltage is i av (02 is off).
II 0 to 5.6 v. v·aries with frequency.
+12 to 7.3 V.
I Approximately 4 V below emitter of 06.
II Voltage equal or greater than voltage at Pin 3 of U6.
Voltage equal or greater than voltage at S of 05.
0 v. -12 V to -6.4 V.
I Approximately 4 V above emitter of 012.
Log converter. Used in log frequency only.
+7.5 Vdc.
± 1.2V pulse.
1 OV in CONT SWP.
I Trigger sweep control input buffer amplifier.
I Sweep mode control logic.
Table 6-9. Transition Time Troubleshooting Guide
Note: All components are on the sweep board
Test Point
Junctions of C1 and C2, C11 and C12
01 and 04
02 and 05
CR3-CR6
07-010
Observation
Square wave (ECL level) input to the transition time generator.
Leading edge current switch.
Trailing edge current switch.
Peak level clamp.
Unity gain amplifier. Output (emitter of 09) is± 1.2 V pulse.
Table 6-10. Sweep Circuit Troubleshooting Guide
Note: Unless otherwise noted, the sweep generator is set to CONT SWP and SWEEP TIME to 10 ms. All components are on the sweep board.
Test Point
Base of 011
Emitter of 014
Pins 3 and 6 of U1
Pin 3 of U2
012 and 013
+6 Vdc.
+6 Vdc.
-0.2 to +5.5 V ramp.
0 to +5 V ramp.
Observation
, 012 is off and 013 is on during ramp up t;me. 012 is on and 013 :s off ·,;vher. ramp resets.
Reset current is discharged through the collector-base junction of 015. 015
016and017 In TRIG SWP mode, 016 and 017 hold the quiescent voltage of the ramp at pin 3 of U1 to -200 mV, which ensures CR29 is reverse biased and output at U2 is OV.
P 2 of U6
Pin 6 of U6
0 V peak detector input.
+5V peak detector input.
6-9
7.1 DRAWINGS
The following assembly drawings, parts lists and schematics
are in the arrangement shown below.
7.2 ORDERING PARTS
When ordering spare parts, please specify part number,
circuit reference, board, serial number of unit and the
function performed.
Drawing Drawing No.
Instrument Schematic 0004-00-0128 Chassis Assembly 0102-00-0649 Chassis Parts List 11 01-00-0649
Main Board Schematic 0103-00-0628 Main Board Assembly 0101-00-0628 Main Board Parts List 1100-00-0628 Main Board Switch Assemblies 1202-00-0041
Shi·eld Board Assembly 0101-00-0684 Shield Board Parts List 11 00-00-0684
SECTION 1 PARTS AND SCHEMATICS
7.3 ADDENDA
Under Wavetek's product improvement program, the latest
electronic designs and circuits are incorporated into each Wavetek instrument as quickly as development and testing permit. Because of the time needed to compose and print instruction manuals, it is not always possible to include the most recent changes in the initial printing. Whenever this occurs, addendum pages are prepared to summarize the changes made and are inserted immediately inside the cover.
Drawing Drawing No.
Sweep and Transit Time 0103-00-0629 Board Schematic Sweep and Transit Time 0101-00-0629 Board Assembly Sweep and Transit Time 11 00-00-0629 Board Parts List
Sweep and Transit Time 1202-00-0042 Board Switch Assemblies
Power Supply Schematic 0103-00-0645 Power Supply Assembly 0101-00-0645 Power Supply Parts List 1100-00-0645
Rear Panel Assembly 0102-00-0648 Rear Panel Parts List 1206-00-0648
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