User Manual

42 GMC-I Messtechnik GmbH
Measurements: V/Hz/dB – PQ/ – MHz/% – Ω/nS/R
SL
– / – Temp – /m – W/Wh – A/Hz/thd
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.
Interference 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 6.0 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!
COM
V
Temp
Ω
Forward Direction Reverse Direction
0V !
0 . 654
0
. L
up to 6.000 V
Measuring Range:
+
–
0.443
V
!
000 . 8
Ω
DC
FUNC
ENTER