Manual Gossen Metrawatt METRAHIT 27EX (page 14 of 36) (English)

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14 GMC-I Messtechnik GMBH

automatically adjusted, the measuring ranges should not

be changed manually.

The DATA function is deactivated if the DATA | CLEAR key is

pressed and held (approx. 1 s) or by switching the instru-

ment off and back on again.

7 Milliohm Measurement (4-Pole-Measurement)

7.1 Compensation of Cable Resistance

Electrical resistance is a dipole quantity which can

generally only be measured using two poles. This is

accomplished by directing a measuring current of

predetermined magnitude through the device under test,

and measuring the resultant voltage drop. The respective

resistance value is derived from the quotient of these two

values.

The two points between which voltage is measured are

decisive as regards the results of the measurement. All

resistances between these two points add to the

measured resistance value. These include contact

resistance, as well as cable resistance. If a very low

resistance value needs to be measured, for example

contact resistance at a contactor with a value of only a few

milliohms, the points between which voltage is measured

must be moved out of the measuring instrument and

positioned as closely as possible to the device under test.

For this reason, the measuring instrument is equipped with

separate jacks for current feed and voltage measurement.

This type of 4-pole connection is known as connection

according to Kelvin.

KC4 Kelvin clips and KC27 Kelvin probes (available as

accessories) allow for easy, correct connection.

7.1.1 Measurement with Kelvin Probe KC27

m

U+U–

I+

red

black

Milliohm measurement on

conductor bars, welds,

coils, etc. with Kelvin probe

KC27 and Kelvin clip KC4

Direct the spring-loaded test

probe inward towards the DUT,

if possible, as it is connected

via the red plug with U

or U

–

(Sense) .

I–

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Gossen Metrawatt METRAHIT 27EX Manual

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