Manual Gossen Metrawatt SECULIFE ST HV (page 19 of 72) (English)

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GMC-I Messtechnik GmbH 19

9 Measuring Protective Conductor Resistance

Definition

Protective conductor resistance

is the sum of the following

resistances:

• Connector cable or device

connector cable resistance

• Contact resistance at plug

and terminal connections

• Extension cable resistance if

utilized

Resistance is measured:

• Between each conductive

part of the housing and the earthing contacts at the mains and the de-

vice plug (if a removable mains connector cable is used), or the protec-

tive conductor terminal for permanently installed devices.

• as 4-pole measurement

• Between the earthing contacts at the mains plug and the earthing

contacts at the device plug for device connector cables

• Between the earthing contacts at the mains plug and the earthing

contacts at the coupling socket for extension cables

Connecting Safety Class I Devices to the Test Socket

When the DUT is connected, resistance is measured between the protec-

tive conductor terminal at the test socket or at the PE jack and the probe

connection at the DUT (contact with conductive parts of the housing).

õ In order to measure protective conductor resistance, contact a

conductive part of the housing with the probe, which is connected to

the protective conductor.

During measurement, the connector cable must only be moved in as far as

it is accessible during repair, modification or testing.

If a change in resistance occurs during the manual test step of the conti-

nuity test, it must be assumed that the protective conductor is damaged,

or that one of the connector contacts is no longer in flawless condition.

Testing Extension Cables

See test sequence in chapter 15.7 on page 46.

Note

“Connection of the DUT: SC I/II” is not displayed when the test is

performed individually, but rather only during the automatic test

sequence.

Selecting Test Current and Polarity

Test current amperage (200 mA DC or 10 A AC (Feature G00 or SECULIFE ST) or

200 mA DC, 25 A AC (Feature G01 or SECULIFE ST

HV)) as well as polarity can

both be changed by pressing the or the key.

Testing with 10 A Test Current (Feature G00 or SECULIFE ST)

or 25 A (Feature G01 or SECULIFE ST

HV)

The test has a maximum duration of 30 s (fixed value) if 10 A or 25 A test

current is used. After this time period has elapsed, the last measured

value is frozen and “data hold, measurement stopped” appears at the dis-

play. If the test instrument becomes excessively warm, testing cannot be

repeated until after a waiting period of 1 minute. When testing with 10 A or

25 A, the last measurement can be repeated if the test results in failure.

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Gossen Metrawatt SECULIFE ST HV Manual

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