Manual Gossen Metrawatt METRISO PRIME (page 6 of 14) (English)

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6 GMC-I Messtechnik GmbH

3.4 Analog Display

Logarithmic representation of the upper resistance scale allows for quick

recognition of the magnitude involved.

In order to achieve the required accuracy for testing of protective mea-

sures, the RANGE key allows for switching to the expanded lower limit

measuring range of 100 k ... 100 M.

The orange colored LEDs, (4) and (5), at the right end of the scale indicate

which of the two resistance measuring ranges is currently active.

The  indicator LED lights up green to confirm correct insulation mea-

surement. If this LED does not light up, test voltage has not been

achieved. In this event a battery test is advisable.

The two lower scales are for voltage measurement and battery testing;

see Chapter 3.2.

4 Direct and Alternating Voltage Measurements

Direct voltages and sinusoidal alternating voltages with frequencies rang-

ing from 15 to 500 Hz can be measured with the tester. Deflection of the

needle at the instrument is always positive for direct voltage measure-

ments, regardless of polarity at the connections. Alternating voltage is

indicated as an effective value.

Voltage measurements are used to test for the absence of voltage prior to

insulation resistance measurements, as well as for the automatic dis-

charge of capacitive devices under test. The voltage drop can be

observed at the display.

Note



Voltage measurement can always be performed with the function

selector switch in the “V” position, regardless of the position of the

range selector switch (even without batteries).

Ð Set the function selector switch to the “V” position.

Ð Check to see that the needle points to “0” in the V scale when the test

prods are not connected. Reset the needle as required with the ad-

justor screw for mechanical zero adjustment.

The position of the range selector switch has no influence on voltage mea-

surements, although we recommend setting it to the OFF/V position.

Ð Contact the measuring points with both test prods.

Ð Read the measurement value at the V scale.

Note



Voltages of greater than 2000 V may not be applied. Input resis-

tance for the voltage measuring range is equal to 5 M

5 Insulation Resistance Measurement

Be certain that the device under test is voltage-free before performing

measurements; see Chapter 4.

For measurements within a range of 100 G (10 G) ... 1 T the guard

cable should be used; see Chapter 5.3, page 8.

5.1 Measurement Procedure

Ð Set the function selector switch to the  position, in order to activate

test voltage.

Ð A range of either 10 k ... 1 T or 100 k ... 100 Mcan be pre-se-

lected with the RANGE key.

Ð Select the required nominal voltage of 100 V, 250 V, 500 V, 1000 V,

1500 V, 2000 V, 2500 V or 5000 V with the range selector switch de-

pending upon the nominal voltage of the DUT.

When lit, the LED (4) indicates that the upper limit measuring range of

10 k ... 1 T has been activated.

Ð Contact the measuring point with both test prods and wait until the

needle has come to rest. Depending upon the DUT this might take

only a few, or up to 30 seconds, if, for example, large capacities (long

cables) must be charged.

Ð Read the measurement value from the upper scale.

If the  indicator LED (3) lights up green, the insulation measurement

is valid. If this LED does not light up, test voltage has not been

achieved. In this event a battery test is advisable; see Chapter 3.2,

page 5.

Ð In order to achieve the required accuracy for testing of protective

measures, select the high resolution range, 100 k ... 100 M, with

the help of the RANGE key. The LED (5) lights up.

Ð Contact the measuring point with both test prods once again.

Ð Read the measurement value from the lower scale.

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