Dranetz DranTech Xtra, Руководство пользователя

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DranTech X
TRA
User’s Guide
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
∞
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 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 measurement! If the
fuse’s blowing limits are exceeded as a result of operator 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 in the same way as for voltage meas-
urement.
∞
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.
∞
You can switch back and forth between frequency measurement
with and without low-pass filter. Press the
FUNC | ENTER multi-
function key repeatedly until unit of measure Hz or Hz/Fil appears
at the display. Lowest measurable frequencies and maximum al-
lowable 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 volt-
ages of greater than 1 kHz can be suppressed.
The active low-pass filter is indicated by the Fil display. The multime-
ter 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.