Alternating Voltage Measurement With 1 M Load Resistance And Frequency Measurement With Selectable Low-Pass Filter - Gossen MetraWatt METRAHIT PM TECH Operating Instructions Manual

V/Hz, , Temperature,
and A/Hz Measurements
7.1.2 Alternating Voltage Measurement with 1 M Load Resistance
and Frequency Measurement with Selectable Low-Pass Filter
The measuring instrument includes a V
electricians with an input resistance of approximately 1 M.
Erroneous displays resulting from capacitive coupling during
voltage measurement in power supply systems are reduced to a
minimum in this way.
Note
See note in chapter 7.1.1.
➭ In accordance with the voltage to be measured, turn the rotary
switch to V~ or
1 kHz
1M
➭ 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 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.
25
switch position for
1M
.
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 10, "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 "Volt-
age Comparator".
We recommend measuring voltage without the low-pass fil-
ter first, in order to be able to detect any dangerous volt-
ages.
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.
Gossen Metrawatt GmbH