Bedienungsanleitung Benning IT 120B (Seite 7 von 80) (Englisch)

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Remarks concerning the measuring functions

General

- The symbol means that the selected measurement cannot be carried out due to irregular

conditions at the input terminal.

- Carry out measurements of insulating resistance, resistance/ continuity test and earth resis-

tance at discharged objects only!

- ThePASS/FAILindicationisactivatedwhenalimitingvaluehasbeendened.Choosealimi-

ting value which is appropriate for evaluating the measuring results.

- If only two of three cables are connected to the electrical system to be tested, only the voltage

indication between these two cables is valid.

Insulating resistance

- If the voltage between the testing terminals is higher than 10 V (AC or DC), the measurement

of the insulating resistance will not be carried out.

Resistance/ continuity Test

- If the voltage between the testing terminals is higher than 10 V, the resistance measurement/

continuity test cannot be carried out.

- Before carrying out the low-impedance measurement, the test cable resistance has to be com-

pensated (if necessary). This compensation is done by means of the LowΩ function.

Residual current protection (FI/RCD)

- Parameters set in this function are also kept for other RCD functions.

- The measurement of contact voltage in pre-test does not normally trip an RCD. However, the

triplimitmaybeexceededasaresultofleakagecurrentowingtothePEprotectiveconductor

or via a capacitive connection between L and PE conductors.

- Compared to the loop impedance R

(contact voltage subresult), the measurement of the loop

impedance Zsrcd offers increased accuracy.

- The tripping time and tripping current measurement is only carried out when the contact voltage

at nominal differential current is lower than the preset limiting value of the contact voltage.

- The autotest sequence stops when the trip-out time is outside the allowed time period.

Loop impedance

- L and N test terminals are reversed automatically if L/L1 and N/L2 test leads (universal test

cable) are connected in reversed way, or terminals of the tested wall plug are reversed, or plug

commander is turned around.

- Thespeciedaccuracyoftestedparametersisvalidonlyifthemainsvoltageisstableduring

the measurement.

- The low limit prospective short-circuit current value depends on fuse type, fuse current rating,

fuse trip-out time and I

PSC

scaling factor.

- Loop impedance (Zs) measurement trips an RCD.

- Measurement of the loop impedance (Zsrcd) does not normally trip an RCD. However, the trip

limitmaybeexceededasaresultofleakagecurrentowingtothePEprotectiveconductoror

via a capacitive connection between L and PE conductors.

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Benning IT 120B Seite 7

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