Manual Gossen Metrawatt METRAHIT ULTRA (page 31 of 74) (English)

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GMC-I Messtechnik GmbH 31

V/Hz/dB – Ω, 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.

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Gossen Metrawatt METRAHIT ULTRA Manual

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