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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
L
(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.
7


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