Manual Gossen Metrawatt METRAHIT X-TRA (page 28 of 71) (English)

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28 GMC-I Messtechnik GmbH

V/Hz, Ω, Temperature, and A/Hz Measurements

5.1.2 Alternating Voltage Measurement with 1 MΩ Load Resistance

and Frequency Measurement with Selectable Low-Pass Filter

(METRAHIT⏐X-TRA⏐OUTDOOR⏐TECH⏐PRO only)

The measuring instrument includes a V

1MΩ

switch position for

electricians with an input resistance of approximately 1 MΩ.

Erroneous displays resulting from capacitive coupling during

voltage measurement in power supply systems are reduced to a

minimum in this way.

Note

METRAHIT⏐TECH: see note in chapter 5.1.1.

Ð In accordance with the voltage to be measured, turn the rotary

switch to V~

1MΩ

or .

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 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!

Ð You can switch back and forth between voltage measurement

with and without low-pass filter.

Ð Press the FUNC | ENTER multifunction key repeatedly until unit of

measure V or V/Fil appears at the display.

Frequency Measurement

Ð Apply the measured quantity is the same way as for voltage

measurement.

Ð 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.

Ð You can switch back and forth between frequency

measurement with and without low-pass filter.

Press the FUNC | ENTER multifunction key repeatedly until unit of

measure Hz or Hz/Fil 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.

1 kHz

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