Model 72-8155: OPERATING MANUAL l l l l Model 72-8155: OPERATING MANUAL 21 B. Continuity & Diodes Range Resolution Overload Protection Function Diode Continuity 1mV 1 250V rms Remarks:

Model 72-8155: OPERATING MANUAL

1

Table of ContentsTitle PageOverviewInspectionSafety InformationRules For Safe OperationInternational Electrical SymbolsThe Meter StructureFunctional ButtonsDisplay SymbolsMeasurement Operation A. Measuring Resistance B. Diode and Continuity Test C. Capacitance Measurement D. Inductance Measurement E. Transistor hFE MeasurementGeneral SpecificationsAccuracy Specifications A. Resistance Test B. Continuity & Diodes C. Capacitance Test D. Inductance Test E. TransistorMaintenance A. General Service B. Replacing the Battery C. Replacing the Fuse

3445789101111131517181920202121222223232425


2


3

Overview


4

Inspection

1

2

3

Safety Information

Warning

l

l

ll

l

l

l

l

Rules For Safe Operation


5

l

l

l

l

l

l


6

Lx


7

International Electrical Symbols


72-8155

8

The Meter Structure (see figure 1)

(figure 1)


9

Functional Buttons

β


10

Display Symbols (see figure 2)

(figure 2)

No.

l

l

1.

2.3.


11

Measurement Operation

A. Measuring Resistance (see figure 3)

(figure 3)

l

l

l

l


12

Note

To avoid damage to the Meter or to the devices undertest, disconnect circuit power and discharge all thehigh-voltage capacitors before measuring diodes andcontinuity.

Warning

Testing Diodes

Insert the red test clip into the terminal andthe black test clip into the COM terminal.Set the rotary switch to .For forward voltage drop readings on any semiconductorcomponent, place the red test clip on the componentísanode and place the black test clip on the componentíscathode.The display shows the diode forward voltage dropísnearest value.

1.

2.3.

Use the diode test to check diodes, transistors, and othersemiconductor devices. The diode test sends a currentthrough the semiconductor junction, and then measuresthe voltage drop across the junction. A good silicon junctiondrops between 500mV and 800mV.

To test a diode out of a circuit, connect the Meter as follows:


13

(figure 4)

l

l

l

1.

2.3.

4.

5.

l

l


14

Note

Note

1.

2.

3.

4.


15

C. Capacitance Measurement (72-8155 only, see figure 5)

(figure 5)

l

ll

l


16

Note

l

l

ll


17

D. Inductance Measurement (see figure 6)

(figure 6)

1.2.

3.

4.

Remarks:

l


18

(figure 7)

1.2.3.

4.

Note:

l

llllll

l

l

l

lllll


19

General Specifications

ll

l


20

Accuracy Specifications

A. Resistance Test

Range Resolution Accuracy

200

2k

20k

200k

2M

20M

0.1

1

10

100

1k

10k

Remarks:

(0.8%+3)

(0.8%+1)

[2%(rdg-12)+5]

l

l

l

l

l


21

B. Continuity & Diodes

Range ResolutionOverload

ProtectionFunction

Diode

Continuity

1mV

1250V rms

Remarks:

C. Capacitance Test

Range Resolution Accuracy Testing Frequ-ency / Voltage

2.000nF

20.00nF

200.0nF

2.000µF

20.00µF

200.0µF

600µF

0.001nF

0.01nF

0.1nF

0.001µF

0.01µF

0.1µF

0.001mF

(1%+5)

(4%+5)

Reference only

1kHz/150mV

100Hz/15mV

100Hz/1.5mV

Remarks:

ll

The display value is thetested transistorís

(NPN, PNP) nearestvalue (0~1000 )


22

E. Transistor

Range Resolution Remarks

hFEVce 5.8V

I bo 10µA

Testing

Condition

1

D. Inductance Test

Range Resolution Accuracy Tested Frequ-ency / Current

2mH

20mH

200mH

2H

20H

0.001mH

0.01mH

0.1mH

0.001H

0.01H

(2%+8)

(5%+5)

(5%+15)

1kHz/150µA

100Hz/15µA

Remarks:

l

l

l

l


23

Maintenance

Warning

1.

2.

3.4.

5.


24

(figure 8)

To replace the battery:

Warning

To replace the Meterís fuse:1.

2.

3.

4.

5.

6.

7.

(figure 9)

SCREW

25


26


Documents

Model 72-8155: OPERATING MANUAL l l l l Model 72-8155: OPERATING MANUAL 21 B. Continuity & Diodes Range Resolution Overload Protection Function Diode Continuity 1mV 1 250V rms Remarks: