Manual Gossen Metrawatt METRALINE ISO-CHECK (page 5 of 8) (English)

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GMC-I Messtechnik GmbH 5

3.3.2 Insulation Resistance Measurement

➭ Switch insulation measurement on by pressing the RISO/USPD

key.

Figure 3.7: Setting Test Voltage

➭ Select the required measuring voltage with the help of the

▲

UTEST and ▼ UTEST keys. By briefly pressing the respective

key, voltage is increased or decreased to one of the following

nominal values: 50, 100, 250, 500 or 1000 V. The selected

test voltage appears at the display in the U

TEST field. For indi-

vidualized value settings, press and hold either the

▲ UTEST or

▼ UTEST key until the value can be changed in 1 V steps

within a range of 50 to 1000 V. The desired value is then se-

lected by once again briefly pressing the respective key. Sev-

eral seconds after one of these two keys has been activated

for the last time, the test instrument is returned to the mode

which allows for switching amongst nominal values of 50,

100, 250, 500, 1000 V only.

➭ Contact the device under test with both test probes.

Figure 3.8: Connection Example

Note

If an interference voltage of greater than about 10 V is

present in the measured electrical circuit, its value is dis-

played and the START key is disabled (see section 3.3.1

on page 4). Eliminate the source of interference voltage

before continuing with the measurement.

➭ Trigger measurement by pressing the START key. Release the

key as soon as measurement is started.

Rising measuring voltage is displayed by means of a bar

graph (this may take several tens of seconds in the case of

large capacitances). At the same time, the value appears at

the display in the UIN field. The measuring cycle is ended auto-

matically.

Note

If measurement needs to be continued for a longer period

of time, the START key has to be pressed and held for the

entire duration.

In contrast to this, the automatic cycle can be ended pre-

maturely by briefly pressing the START key. No results are

displayed in this case.

➭ Read the measured insulation resistance value.

Note

The device under test may not be disconnected from the

test instrument as long as the “!” warning symbol is lit up.

Discharging large capacitances may take several tens of

seconds!

Note

Whistling or hissing noises may emanate from the test

instrument during measurement.

3.3.3 Measurements at Varistors (surge protection devices)

For this measuring function, the test instrument generates a rising

direct voltage within a range of 50 to 1000 V and, at the same

time, measures current flowing through the device under test. As

soon as current reaches a level of 1 mA, voltage is no longer

increased and the voltage value for the so-called milliampere

point appears at the display. In accordance with the respective

function which has been selected with the FUNC key, results for

overcurrent protection devices are also evaluated automatically

and listed as shown in the following table.

Note

If the DCMAX function has been selected, the upper voltage

limit for automatic results evaluation can be adjusted with the

▲ UTEST and ▼ UTEST keys.

If the DCMIN function has been selected, the lower voltage

limit for automatic results evaluation can be adjusted with the

▲ UTEST and ▼ UTEST keys.

For actual measurement or evaluation, it doesn’t matter which of

these two functions is selected, i.e. either DCMAX or DCMIN.

* Table for Surge Protection Device

If the SPD LIST function is selected (SURGE PROTECTION DEVICE

TABLE), a specific type and manufacturer/distributor is suggested

at the display, voltage at the milliampere point is displayed and

further information may appear as well.

The required type of surge protection device can be selected with

the

▲ UTEST and ▼ UTEST keys.

Switch to off position!

Figure 3.9: Sample Results for an

Insulation Measure-

ment (the DUT is

being discharged)

Figure 3.10: Insulation Measure-

ment Results (the DUT

has been fully

discharged: U

IN = 0 V)

Symbol in the Display and its Meaning

Selected function

DC Voltage at the milliampere point

is measured

Voltage at the milliampere point

is outside of the measuring

range

DCMAX

DCMIN

Voltage at the milliampere point

is within the specified range

Voltage at the milliampere point

is outside of the specified range

SPD LIST * Voltage at the milliampere point

is within the specified range for

the selected type of surge pro-

tection device

Voltage at the milliampere point

is outside of the specified range

for the selected type of surge

protection device

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