User Manual

38 GMC-I Messtechnik GmbH

V/Hz, , Temperature, and A/Hz Measurements

5.4 Diode Testing with Constant Current of 1 mA

Ð Disconnect supply power from the electrical circuit of the de-

vice to be measured, and discharge all high-voltage capaci-

tors.

Ð Make sure that the device under test is voltage-free. Interfer-

ence voltages distort measurement results!

Refer to section 5.1.1 regarding testing for the absence of volt-

age with the help of the direct voltage measurement.

Ð Set the rotary switch to .

Ð Acknowledge by pressing the

FUNC

| ENTER

key.

Ð Connect the device under test as shown.

Forward Direction and Short-Circuit

The instrument displays forward voltage in volts (display: 4

places). As long as voltage drop does not exceed the maximum

display value of 4.5 V, several series connected components or

reference diodes can be tested with a small reference voltage and

Z-diodes.

Reverse Direction and Interruption

The measuring instrument indicates overload: “0 L”.

Note



Resistors and semiconductor paths connected in parallel to

the diode distort measurement results!

Attention!

Observe high open-circuit voltage of 6 V during diode test-

ing: Circuits must be laid out accordingly.

COM

Tem p



Forward Direction Reverse Direction

0V !

654

Up to 4.5 V

Measuring Range:

–

0.443

000.8



FUNC

ENTER