Bedienungsanleitung Gossen Metrawatt METRISO 5024 (Seite 8 von 14) (Englisch)

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8 GMC-I Messtechnik GmbH

4.2

Insulation Resistance Measurement (VDE 0413, part 2 / EN 61557, part 2)

Attention!

Insulation resistance measurements may only be performed

on voltage-free system components and devices!

Adhere to the prescribed sequence:

Ð Set the rotary switch (3) to the desired test voltage:

100 V, 250 V or 500 V.

Ð Contact the device under test with the test probes

(1: positive pole and 8: negative pole).

Ð When the toggle switch is in the neutral position, the

METRISO 5024 functions as a voltmeter for testing for the absence

of voltage.

Immediately after contacting the device under test, the user can

determine whether or not it is voltage-free.

A capacitively charged device under test is discharged directly

via the voltmeter’s internal resistance. Discharging can be

observed at the display. However, if the voltage value remains

constant insulation resistance cannot be measured until the

device under test has been disconnected from all sources of

voltage.

If zero voltage is displayed, measurement can be performed

immediately.

Ð Insulation resistance measurement is performed for as

long as the toggle switch is held in the MΩ position.

Read the measured value from the logarithmic scale

within a range of 100 kΩ to 400 MΩ.

Ð End the measurement by releasing the toggle switch. Capacitive

devices under test which have been charged by direct test

voltage are discharged by the voltmeter.

Ð Remove the test probes from the device under test.

Attention!

When insulation resistance is measured at capacitive devices under

test, e.g. cables, they may be charged with an open-circuit voltage

of up to approximately 700 V, and may retain this charge for a

lengthy period of time. This is a life endangering voltage, and the

device under test must be discharged after measurement for this

reason (see “testing for the absence of voltage” above).

Evaluating Measured Values

According to DIN VDE 0100, the insulation resistance of system

components must have a value of at least 1000 Ω per V nominal

voltage without any current-consuming apparatus in the line section

between two overcurrent protection devices or switches, or

downstream from the last overcurrent protection device, for example

Insulation Resistance Scale LED Beeper

Measured value ≥ limit value is displayed green continuous signal

Meas. value < 250 k

with U

=250 V

Meas. value < 500 k

with U

=500 V

value is displayed green periodic sequence

of signals

Measurement not possible:

– < 100 kΩ

– Battery voltage too low

– Rotary or toggle switch

not adjusted correctly

pointer oscillates

green blinks

red

green blinks

periodic sequence

of signals

no signal

500 V

250 V

100 V

MΩ

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