User Manual

GMC-I Messtechnik GmbH 31
V/Hz/dB – , Temperature, and A/Hz Measurements
5.1.2 Alternating Voltage and Frequency Measurement V AC and Hz
V AC with Selectable Low-Pass Filter, V AC + FiL and dB V AC
Note

See note in section 5.1.1.
Ð In accordance with the voltage or frequency to be measured,
turn the rotary switch to V~.
Ð Connect the measurement cables as shown.
The “” connector jack should be grounded.
Voltage Measurement
Note

An intermittent acoustic signal warns the operator if the
measured value exceeds the upper range limit in the 600 V
range.
Make sure that a current measuring range (“A”) has not been acti-
vated when the multimeter is connected for voltage measure-
ment! If the fuse’s blowing limits are exceeded as a result of oper-
ator error, both the operator and the instrument are in danger!
Ð You can switch back and forth between voltage measurement
with and without low-pass filter.
Ð Repeatedly press the multifunction key FUNC | ENTER until unit
of measure V in appears at the main display, and FILTER ap-
pears in the header for measurement with low-pass filter.
Frequency Measurement
Ð Connect the measured quantity in the same way as for voltage
measurement.
Ð Manually select the measuring range for the voltage amplitude.
Ð Repeatedly press the multifunction key FUNC | ENTER until unit
of measure Hz appears at the display.
Lowest measurable frequencies and maximum allowable volt-
ages are listed in section 8, “Technical Data”,.
Note

Measurements performed close to the trigger level may result in
an incorrect display. If this is the case, select a smaller volt-
age measuring range.
In the case of measured values which are much higher than
the expected results, the input signal may be distorted. Per-
form measurement with activated 1 kHz low-pass filter in
this case.
Measurement with Low-Pass Filter
Attention!
!
Be aware of the fact that dangerous voltage spikes are not
displayed during this type of measurement (see also “Volt-
age Comparator”. We recommend measuring voltage with-
out the low-pass filter first, in order to be able to detect any
dangerous voltages.
A 1 kHz low-pass filter can be activate if required, in order to filter
out high frequency pulses of greater than 1 kHz, for example
when performing measurements at pulsed motor drives, i.e. un-
desired voltages of greater than 1 kHz can be suppressed.