User Manual

30 GMC-I Gossen-Metrawatt GmbH
V/Hz, Ω, Temperature, and A/Hz Measurements
5.1.3 Alternating Voltage and Frequency Measurement V AC and Hz
with Selectable Low-Pass Filter
(METRAHIT EXTRA, METRAHIT ETECH and
METRAHIT E
SPECIAL only)
Note

For all multimeters except the METRAHIT EBASE: see note in
chapter 5.1.1.
➭ In accordance with the voltage or frequency to be measured,
turn the rotary switch to V~ or Hz.
➭ Connect the measurement cables as shown.
The “⊥” connector jack should be grounded.
Voltage Measurement
Note

An intermittent acoustic signal warns the operator if the meas-
ured value exceeds the upper range limit in the 1000 V range.
Make sure that a current measuring range (“A”) has not been
activated 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!
➭ You can switch back and forth between voltage measurement
with and without low-pass filter.
➭ Press the FUNC | ENTER multifunction key repeatedly until unit of
measure V or V/Fil appears at the display.
Frequency Measurement
➭ Apply the measured quantity is the same way as for voltage
measurement.
➭ Manually select the measuring range for the voltage amplitude.
When the instrument is switched to frequency measurement,
the previously selected voltage measuring range remains
active.
➭ Press the FUNC | ENTER multifunction key repeatedly until unit of
measure Hz appears at the display.
Lowest measurable frequencies and maximum allowable
voltages are included in chapter 8, “Technical Data”.
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 “Voltage
Comparator”.
We recommend measuring voltage without the low-pass filter
first, in order to be able to detect any dangerous voltages.
A 1 kHz low-pass filter can be activated 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.
undesired voltages of greater than 1 kHz can be suppressed.
The active low-pass filter is indicated by the Fil display. The
multimeter is automatically switched to manual measuring range
selection.
The specified measuring accuracy is not achieved when the filter
is activated and signals are greater than 100 Hz.