Bedienungsanleitung Metrel MI 3152 - EurotestXC (Seite 10 von 204) (Englisch)

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MI 3152(H) EurotestXC (2,5 kV) General description

1.1.5 Notes related to measurement functions

Insulation resistance

 The measuring range is decreased if using Plug commander.

 If a voltage of higher than 30 V (AC or DC) is detected between test terminals, the

measurement will not be performed.

Diagnostic test

 If any insulation resistance values (RISO(15 s) or RISO(60 s )) are over-ranged the DAR

factor is not calculated. The result field is blank: DAR:_____!

 If any insulation resistance values (RISO(60 s) or RISO(10 min)) are over-ranged the PI

factor is not calculated. The result field is blank: PI :_____!

R low, Continuity

 If a voltage of higher than 10 V (AC or DC) is detected between test terminals, the

measurement will not be performed.

 Parallel loops may influence on test results.

Earth, Earth 2 clamp, Ro

 If voltage between test terminals is higher than 10 V (Earth, Earth 2 clamps) or 30 V (Ro)

the measurement will not be performed.

 Contactless earthing resistance measurement (using two current clamps) enables

simple testing of individual earthing rods in large earthing system. It is especially suitable

for use in urban areas because there is usually no possibility to place the test probes.

 For two clamps earth resistance measurement clamps A 1018 and A 1019 should be

used. Clamps A 1391 are not supported. The distance between clamps should be at

least 30 cm.

 For specific earth resistance measurements  Adaptor A 1199 should be used.

RCD t, RCD I, RCD Uc, RCD Auto

 Parameters set in one function are also kept for other RCD functions!

 Selective (time-delayed) RCDs have delayed response characteristics. As the contact

voltage pre-test or other RCD tests influence the time delayed RCD it takes a certain

period to recover into normal state. Therefore a time delay of 30 s is inserted before

performing trip-out test by default.

 Portable RCDs (PRCD, PRCD-K and PRCD-S) are tested as general (non-delayed)

RCDs. Trip-out times, trip-out currents and contact voltage limits are equal to limits of

general (non-delayed) RCDs.

 The a.c. part of MI and EV RCDs is tested as general (non-delayed) RCDs.

 The d.c part of MI and EV RCDs is tested with a d.c. test current. The Pass limit is

between 0.5 and 1.0 IdNDC.

 The Zs rcd function takes longer to complete but offers much better accuracy of fault

loop resistance (in comparison to the RL sub-result in Contact voltage function).

 Auto test is finished without x5 tests in case of testing the RCD types A, F, B and B+ with

rated residual currents of IdN = 300 mA, 500 mA, and 1000 mA or testing the RCD type

AC with rated residual current of IdN = 1000 mA . In this case Auto test result passes if all

other results pass, and indications for x5 are omitted.

 Auto test is finished without x1 tests in case of testing the RCD types B and B+ with

rated residual currents of IdN = 1000 mA. In this case Auto test result passes if all other

results pass, and indications for x1 are omitted (MI 3152 only).

 Tests for sensitivity Idn(+) and Idn(-) are omitted for selective type RCD.

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