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Model 72-8155: OPERATING MANUAL
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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
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Overview
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Inspection
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Safety Information
Warning
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Rules For Safe Operation
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Lx
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International Electrical Symbols
Model 72-8155: OPERATING MANUAL
72-8155
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The Meter Structure (see figure 1)
(figure 1)
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Functional Buttons
β
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Display Symbols (see figure 2)
(figure 2)
No.
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1.
2.3.
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Measurement Operation
A. Measuring Resistance (see figure 3)
(figure 3)
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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:
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(figure 4)
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1.
2.3.
4.
5.
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Note
Note
1.
2.
3.
4.
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C. Capacitance Measurement (72-8155 only, see figure 5)
(figure 5)
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Note
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D. Inductance Measurement (see figure 6)
(figure 6)
1.2.
3.
4.
Remarks:
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(figure 7)
1.2.3.
4.
Note:
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General Specifications
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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]
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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:
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The display value is thetested transistorís
(NPN, PNP) nearestvalue (0~1000 )
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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:
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Maintenance
Warning
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2.
3.4.
5.
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(figure 8)
To replace the battery:
Warning
To replace the Meterís fuse:1.
2.
3.
4.
5.
6.
7.
(figure 9)
SCREW
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Model 72-8155: OPERATING MANUAL