Manual Gossen Metrawatt METRISO 1000A (page 4 of 10) (English)

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4 GMC-I Messtechnik GmbH

2 Applications

The METRISO 1000A insulation tester complies with DIN VDE 0413

“Regulations for Devices for the Testing of Protective Measures in Electri-

cal Systems”

Part 1: insulation testers, and

Part 4: ohmmeters.

It is suitable for the measurement of insulation resistance at voltage-free

devices and systems with nominal voltages of up to 1000 V, as well as for

testing resistance at earthing conductors, protective conductors and

bonding conductors including their connections and terminals.

The instrument has also been equipped with a 1000 V measuring range

for direct and alternating voltage. This is especially advantageous for test-

ing for the absence of voltage at devices under test, and for discharging

capacitive devices under test.

3 Initial Start-Up

3.1 Battery Installation

Attention!

Before opening the housing base make, certain that the function

selector switch has been set to the “1000 V” position, and that

the instrument has been fully disconnected from all external

electrical circuits.

➭ Unscrew the housing base.

➭ Insert 6 commercially available, type IEC R20 or IEC LR20 1.5 V

batteries (single cell) with plus and minus poles aligned in accordance

with the symbols in the battery compartment.

➭ Replace the housing base and screw into place.

3.2 Testing the Batteries

Each time the measurement key is activated, the instrument automatically

tests the batteries. Momentary drain on the batteries resulting from the

function selector switch position and the pre-selected nominal voltage are

taken into consideration during this test. Battery condition is indicated by

the color of the indicator lamp at the left-hand portion of the scale area.

Green Lamp: Batteries are OK.

Red Lamp: The batteries are too weak for the currently selected

measurement function.

3.3 Switching the Tester On and Off

The tester remains activated as long as the measurement key in the test

probe is depressed. We recommend setting the function selector switch

to the 1000 V position during transport and maintenance, in order to

prevent the tester from being switched on inadvertently.

3.4 Analog Display

Measurement values are plainly displayed at analog scales. Each of the

function selector switch positions has its own scale. A battery status

indicator lamp is located at the left-hand portion of the scale area.

3.5 Fusing

The instrument is protected with a single common fuse during low-

impedance and insulation resistance measurements. The fuse blows if an

extraneous voltage is inadvertently applied when the instrument is set to

the resistance measuring range.

Voltage measurement is possible regardless of the condition of the fuse.

3.5.1 Checking the Fuse

The Ω and MΩ ranges are no longer functional after the fuse has blown.

Low-Impedance Measuring Range:

The needle remains at the mechanically set zero point when the

measurement key is activated.

Insulation Resistance Measuring Range:

With short-circuited test probes, the needle remains at the mechanically

set zero point when the measurement key is activated.

See chapter 8.2 on page 9, “Replacing the Fuse”.

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Gossen Metrawatt METRISO 1000A Manual

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