User Manual

30 GMC-I Messtechnik GmbH
Measurements: V/Hz/dB – PQ/ – MHz/% – Ω/nS/R
SL
– / – Temp – /m – W/Wh – A/Hz/thd
5.1.2 Alternating Voltage and Frequency Measurement V AC and Hz
with Selectable Low-Pass Filter, V AC + FILTER and dB V AC
Note
Set the CL iP parameter to 0FF in the current clamp setup
menu.
Otherwise all measured values are displayed in amperes,
corrected by the amount resulting from the selected trans-
formation ratio for an interconnected current clamp sensor.
The clamp symbol is also displayed. Refer to section
6.4, "Entering Parameters – SETUP Menu”,
regarding adjustment.
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 mea-
sured 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 measurement!
If the fuse’s blowing limits are exceeded as a result of operator
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 the
unit of measure V, or V and FILTER, appears at the display.
Frequency Measurement
Signal frequency appears at the left-hand auxiliary display when
the instrument executes alternating voltage measurements. A
separate frequency measurement can be additionally performed
by pressing the FUNC | ENTER key, which allows for use of the DATA
and Min-Max functions.
If the measuring signal is too low, switch manually to a lower
range.
Lowest measurable frequencies and maximum allowable voltages
are listed in section 8, "Technical Data”.
Note
For measurements close to the trigger threshold: display
error or zero. Select a lower voltage measuring range. In the
case of measured values which are many times greater than
the expected results, the input signal may be distorted. If this
is the case, perform a measurement with activated 1 kHz
low-pass filter.
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 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.
undesired voltages of greater than 1 kHz can be suppressed.