English
Loop tester
10
Measurements
Description
V
G
: voltage of the generator (electrical network supply voltage transformer)
(internal impedance of transformer is X-Form)
Z
L
: impedance of the line wire from the transformer up to the test point (Z
L
displayed by instrument also includes X-Form). If this impedance is too high,
check the connections of the line wiring, the quality of the line wiring and the
switches / contacts in the line circuit.
Z
N
: impedance of the neutral wire from the transformer up to the test point. If
this impedance is too high, check the connections of the neutral wiring, the
quality of the neutral wiring and the switches / contacts in the neutral circuit.
Z
E
: impedance of the earth wire including the earth impedance itself, as seen
by the protection system. Similar checking, specially at the bounding points
should be done if this path impedance is too high.
PSC
L-E
,
PSC
L-N
: prospective short circuit current (L-N and L-E)
V
L-N
,
V
L-E
: voltage between L-N & L-E
Please note : instrument accuracy depend of V
G
stability while testing
Front face
description
1 – wiring connectors L, N, E (Line, neutral and earth)
2 – display
3 – wiring correct and not correct indicators
4 – button to turn on instrument, start the test and read different results
