Bedienungsanleitung Gossen Metrawatt METRISO C (Seite 20 von 28) (Englisch)

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20 GMC-I Messtechnik GmbH

9 Measuring Low-Value Resistance (to 100 )

According to the regulations, measurement of low-value resistance at

protective conductors, earth conductors and bonding conductors must

be performed with (automatic) measuring voltage polarity reversal, or with

the flow of current in one direction (+ pole to PE), or the other (– pole to

PE).

Attention!

Low-value resistance may only be measured at voltage-free

objects.

Attention!

In order to be able to start the measurement, contact must first be

established between the test probes and the device under test.

If voltage is present at the device under test, or if resistance is greater

than 100  no measurement is performed.

Automatic Polarity Reversal – AUTOFunction

With automatic polarity reversal, the instrument performs measurement

first in one direction and then in the other, after the measuring sequence

has been started.

The largest measured resistance value is always displayed. This

presupposes that AUTO is displayed underneath R

. If either of

the values RLO/+ or RLO/– is displayed instead of AUTO, press

the  key in the menu bar and then AUTO

Resistance values which do not demonstrate stabilized values until after

settling in, should not be measured with automatic polarity reversal.

Measurement with automatic polarity reversal may result in varying,

excessively high measured values and thus to an ambiguous read-out.

Measurement with + Pole to PE, or – Pole to PE

In order to determine whether or not test results are independent of the

direction of flow, measurement can be performed separately in both

directions. Press the  key in the menu bar to this end, and then either +

or – depending upon the desired direction of flow.

Differing results indicate that voltage is present at the device under test

(e.g. thermoelectromotive force or elemental voltage).

Measurement results may be distorted by parallel connected impedances

from load current circuits and equalizing current, especially in systems

equipped with “overcurrent protective devices” (formerly neutralization)

without a separate protective conductor. A change in resistance during

measurement (e.g. inductance), or poor contact may also result in

distorted measurements.

The following are examples of resistance values which may change during

measurement :

– Resistance values for incandescent light bulbs due to warming

caused by test current

– Resistance with an excessively high inductive component

In order to assure unambiguous measurement results, it is necessary to

recognize and eliminate any cause of error.

The instrument’s batteries are depleted rapidly during resistance

measurement. Only press the START key as long as necessary during

measurement with current flow in a single direction.

START

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