User manual

30 GMC-I Messtechnik GmbH
V/Hz, , Temperature, and A/Hz Measurements
Voltage Comparator for Displaying Dangerous Voltage
The input signal or measuring signal is checked by a voltage
comparator for dangerous peaks.
Where U > 33 V AC or U > 70 V DC, two acoustic signals are
generated.
5.3 Resistance Measurement 
➭ Disconnect supply power from the electrical circuit of the
device to be measured, and discharge all high-voltage
capacitors.
➭ Make sure that the device under test is voltage-free.
Interference voltages distort measurement results!
Refer to section 5.2.1 regarding testing for the absence of volt-
age with the help of the direct voltage measurement.
➭ Set the rotary switch to “”.
➭ Connect the device under test as shown.
Note
Use short or shielded measurement cables in the case of
high-impedance resistance.
Improving Accuracy by means of Zero Balancing
Cable resistance and contact resistance can be eliminated in all
measuring ranges by means of zero balancing (see section 4.2).
Maximum correction amounts to 50% of the measuring range.
–+ +
R
x
R
x
0V !
!

000.00
k 

300   30 M
Measuring ranges: