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The Oscilloscope
First Looks : Controls & Indicators
Prepared by:
Jay-R M. Ballon
MAIE-IT
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1. CH1 Position Control
Rotation of this knob will
adjust the vertical position
of the Channel 1 waveformon the screen. In the X-Y
operation, rotation adjusts
vertical position of display.
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2. CH1 Volts/Div Control & Variable
Control
For the Volts/Div Control, it is avertical attenuator for channel 1.Provides step adjustment of verticalsensitivity in 1-2-5 sequence.VARIABLE control is turned to the
CAL position, the calibrated verticalsensitivity is obtained. In X-Yoperation, this control serves as theattenuator for Y-axis.
Rotation of the variable controlprovides fine control of channel 1vertical sensitivity. In the fullyclockwise (CAL) position, the verticalattenuator is calibrated. In X-Yoperation, this control serves as theY-axis attenuation fine adjustment.
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3. CH1 AC-GND-DC Switch
This switch is the Channel 1 vertical axiscoupling mode selector, for X-Yoperation, the Y-Axis coupling modecontrol.
AC:
AC Input coupling with blocking ofany DC signal component.
GND:
Vertical amplifier is disconnectedfrom the input signal and connectedto ground. This mode is useful indetermining the zero reference.
DC:
DC Coupling, with both the DC andAC components of the input signaldisplayed on the CRT.
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4. CH1 INPUT Jack
Vertical input for channel 1
trace in normal sweep
operation. Y-axis input for X-Y
operation.
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5. CH2 Position / PULL INVert Control
CH2 Position:
Rotation adjusts vertical
position of channel 2 trace.
INV:Push-pull switch selects
channel 2 signal inverted when
pulled out.
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6. CH2 Volts/Div Control & Variable
Control Volts/Div Knob:
For the Volts/Div Control, it is a verticalattenuator for channel 1. Provides stepadjustment of vertical sensitivity in 1-2-5sequence. VARIABLE control is turned to
the CAL position, the calibrated verticalsensitivity is obtained. In X-Y operation,this control serves as the attenuator forX-axis.
Variable Control:
Rotation of the variable control provides
fine control of channel 1 verticalsensitivity. In the fully clockwise (CAL)position, the vertical attenuator iscalibrated. In X-Y operation, this controlserves as the X-axis attenuation fineadjustment.
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CH2 AC-GND-DC Switch
Three position lever switch whichoperates as follows :
AC:
Blocks DC Component of channel 2input signal.
GND:
Opens signal path and grounds inputto vertical amplifier. This provides azero-signal base line, the position ofwhich can be used as a referencewhen performing DC measurements.
DC:
Direct input of AC and DC componentof channel 2 input signal.
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8. CH2 INPUT Jack
Vertical input for channel 2
trace in normal sweep
operation. X-axis input in X-Yoperation.
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9. MODE SwitchSelects the basic operating mode of the oscilloscope.
CH1:
Only the input signal to channel 1 is displayed as a
single trace.
CH2:
Only the input signal to channel 2 is displayed as a
single trace. ALT:
Alternate sweep is selected regardless of sweep time.
CHOP:
Chop sweep is selected regardless of sweep time at
approximately 300 KHz.
ADD:The waveforms from channel 1 and channel 2 inputs
are added and the sum is displayed as a single trace.
When the CH2 INV Button is engaged, the waveform
from channel 2 is subtracted from the channel 1
waveform and the difference is displayed as a single
trace.
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10. GND Terminal
Earth and chassis ground
reference.
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11. CAL Terminal
Provides 1 kHz, 1 V peak-to-
peak square wave signal. This is
useful for probe compensationadjustment.
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12. EXT Trigger Input Jack
Input terminal for
external sync signal.
When SOURCE switch
is selected in EXTposition, the input
signal at the EXT TRIG
input jack becomesthe trigger.
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13. Power Switch
A press of this switchturns the power ON.
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14. Power Indicator
Lights when thePOWER switch is
pressed.
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15. Intensity (REAL) Control
Controller for adjusting
the brightness of the
real-time waveform.
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16. Focus / PULL Astig Control
FOCUS: Focusadjustment
ASTIG: Used to bring
the waveform into thebest condition with theFOCUS adjustment byadjusting trace and
spot aberration. Pullthe knob to make aspot circular.
17 S l Ill / PULL T R t
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17. Scale Illum / PULL Trace Rota
Control
SCALE ILLUM:
Brightness adjustment of thescale of the CRT. Forphotographing, rotate the knob
to adjust bright to preventhalation caused by too brightillumination.
TRACE ROTA:
Tilt adjustment of thehorizontal bright line in thecase where geomagnetisminfluences the bright line to tilt.
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18. Variable SWEEP TIME/DIV Control
A SWEEP Time / Div Control
Range select dial of 19 ranges from0.2us/div to 0.5s/div.To calibrate the set value, rotatethe SWEEP VARIABLE controllerclockwise up to the CAL position.
B SWEEP Time / Div ControlRange select dial of 17 ranges from50ms/div to 0.2us/div. Set this dialto a value same as the A SWEEPTime/Div Control or higher than it.
A SWEEP Variable Control
Fine sweep time adjustment. In thefully clockwise (CAL) position, thesweep time is calibrated.
19 H i t l P iti / PULL 10X
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19. Horizontal Position / PULL 10X
Magnification Control
Horizontal position
controller, which provides
horizontal shift of
waveform. By pulling the
knob, the sweep time is
quickened ten times.
In the X-Y operation,
rotation adjusts horizontal
position of display.
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20. Level / PULL Slope (-) Control
LEVEL:
Trigger level adjustment
determines point on
triggering waveformwhere A sweep
triggered.
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21. Hold Off Control
HOLD OFF:
Adjusts hold off (trigger inhibitperiod beyond sweep duration).Clockwise rotation from theNORM position increases hold off
time, up to 10 times at the MAXposition (fully clockwise).
Trace Separation Control
Adjusts vertical separationbetween A sweep and B sweep(control has effect only in the ALT
of HORIZ. MODE). Clockwise rotation increases
separation; B sweep moves downwith respect to A sweep up to 4divisions.
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22. Coupling Switch
Selects coupling for sync trigger signal.
AC:
Trigger is AC coupled. Blocks DCcomponent of input signal; mostlycommonly used position.
HFrej:
Sync signal is DC coupled through a low-pass filter to eliminate high frequencycomponents for stable triggering of lowfrequency signals.
DC:The sync signal is DC coupled for syncwhich includes the effect of DCcomponents.
TV FRAME:Vertical sync pulses of a composite videosignal are selected for triggering.
TV LINE:Horizontal sync pulses of a composite videosignal are selected for triggering.
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23. Source Switch
Sweep trigger source select switch.
VERT MODE:The sweep trigger source is selected withthe MODE selector for the verticaloperation. When the vertical MODEselectors set to CH1, the channel-1 signalis used as a trigger source. When is ser to
CH2, the channel 2 signal is used as atrigger source. When ser to ALT both thechannel 1 and channel 2 signals are usedalternatively. When set to CHOP or ADD,the channel 1 signal is used as a triggersource.
CH1:Channel 1 signal is used as a triggersource.
CH2:Channel 2 signal is used as a triggersource.
LINE:Sweep is triggered by line voltage.
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24. Triggering Mode Control
Selects triggering mode.
AUTO:Triggered sweep operation when trigger signalis present, automatically generates sweep inabsence of trigger signal.
NORM:Normal triggered sweep operation. No trace ispresented when a proper trigger signal is not
applied. X-Y:
X-Y operation. Channel 1 input signalproduces vertical deflection (Y-axis). Channel2 input signal produces horizontal deflection(X-axis).This operates regardless vertical MODEselection.
SINGLE:Single sweep mode
RESET:Reset mode of single sweep operation. whenreset, the switch returns to the SINGLEposition, with the READY LED lighting untilcompletion of the sweep.
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26. Horizontal Mode Switch
Used to select the horizontal displaymode.
A:Only A sweep is operative, with the Bsweep dormant.
ALT:
A sweep alternates with the B sweep.For this mode of operation, the Bsweep appears as an intensifiedsection of the A sweep.
B:Only delayed B sweep is operative.
X-Y:
Channel 1 becomes the Y-axis andchannel 2 becomes the X-axis for theX-Y operation. The setting of thevertical MODE and TRIG MODEswitches have no effect.
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27. Delay Time Position Control
Used to set delay time
of the B sweep start
point from the A sweep
start point, if the HORIZ
MODE selector is set toALT or B position. (Delay
time position) It controls
delay time continuously
between 0,2 and 10times of a set value with
the A sweep time/div
controller.
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28. CRT Screen
This is where all the
output signals will be
displayed.
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29. Test Probe
The test probe
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THANK YOU ;)
Prepared by: Jay-R M. Ballon