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

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8 GMC-I Messtechnik GmbH

5.3 Measurements with the Guard Cable (with Accessory Guard 5000A)

The measurement of very high impedance resistances presupposes

extremely small measurement currents, and can be rendered problematic

by influences such as electromagnetic fields, moisture or surface currents.

For this reason, the measurement set-up must be implemented in an

accurate fashion.

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

cable must be used in order to prevent the distortion of measurement

results caused by surface currents. The guard rings prevent current at the

surface of the insulation material from flowing from the +measurement

cable to the –measurement cable, instead of through the insulation mate-

rial itself.

Ð Insert the guard cable plug into the appropriate jack at the tester.

Ð Plug the crocodile clip onto the guard cable test prod.

Ð Clip the crocodile clip onto the guard ring located between the two

measuring points of the insulation material to be measured.

Ð See Chapter 5.1, page 6 for measurement procedures.

Note



The following materials can be used as guard rings:

aluminum foil, copper foil or metal tubing clamps.

6 Characteristic Values

Insulation Resistance

ShortCircuit Current I

1.3 mA

Direct and Alternating Voltage

Protective Devices

with reference to scale length 97.5 mm (100 M range) or 109.8 mm (1 T range)

PTC thermistor cool-down period until start of new measurement:

at least 2 minutes must be observed!

+Measurement Cable

– Meas. Cable

Guard Cable

Conductor

Insulation

Material

Guard Rings

Contact Ring

Measuring

Range

Nominal

Range of Use

Nominal/Test

Voltage

/ U

Nom./Test

Current

/ I

Intrinsic Un-

certainty

Measuring Un-

certainty

100 k...

100 M

100 k...

10 M

100 V

250 V

500 V

1000 V

1mA

 2.5%

30%

of measured

value

10 k... 1 T

100 k...

100 G

100/1500 V

250/

2000 V

500/

2500 V

1000/5000 V

1mA/0.7mA

1mA/0.5mA

1mA/0.4mA

1mA/0.1mA

 5%

Measuring Range Frequency Internal

Resistance

Max. Allowable

Voltage

Intrinsic

Uncertainty

0 ... 2000 V DC/AC 15 ... 500 Hz 5 M

2200 V DC/AC

max. 10 s

5%

Terminal Internal

Resistance

Max. Allowable

Voltage

Protective Device

–Measurement

Cable

—

to +meas. cable/

to guard cable:

2000 V DC/AC

max. 10 s

via grounded

damping diodes

+Measurement

Cable

Insulation

Measurement

—

to –meas. cable/

to guard cable:

2000 V DC/AC

max. 10 s

diodes in high-voltage

cascade, PTC thermistor

and series resistors

Guard Cable

between guard and

meas. cables 90 k

to meas. cable

2000 V DC/AC

max. 10 s

PTC thermistor

and

series resistors

Battery — 10 V

pole protection

with diodes voltage limiting

in battery charger (optional)

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