Notes Related To Measurement Functions - METREL EurotestXC MI 3152 Instruction Manual

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

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 (R
factor is not calculated. The result field is blank: DAR:_____!

If any insulation resistance values (R
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 IdN

The Zs rcd function takes longer to complete but offers much better accuracy of fault
loop resistance (in comparison to the R

Auto test is finished without x5 tests in case of testing the RCD types A, F, B and B+ with
rated residual currents of I
AC with rated residual current of I
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 I
results pass, and indications for x1 are omitted (MI 3152 only).

Tests for sensitivity Idn(+) and Idn(-) are omitted for selective type RCD.
(15 s) or R
ISO
(60 s) or R
ISO
.
DC
sub-result in Contact voltage function).
L
= 300 mA, 500 mA, and 1000 mA or testing the RCD type
dN
= 1000 mA . In this case Auto test result passes if all
dN
= 1000 mA. In this case Auto test result passes if all other
dN
9
General description
(60 s )) are over-ranged the DAR
ISO
(10 min)) are over-ranged the PI
ISO