1652C/1653B/1654B
Users Manual
26
•
L-PE loop measurement. This is a way of making a high current, 2-wire
loop measurement. It cannot be used on circuits protected by RCDs
because it will cause them to trip.
•
Prospective Short Circuit Current (PSC). PSC is the current that can
potentially flow if the phase conductor is shorted to the neutral conductor or
another phase conductor. The tester calculates the PSC current by dividing
the measured mains voltage by the line impedance.
apx034f.eps
Figure 14. Line Impedance Display
To measure line impedance:
1. Turn the rotary switch to the
position. The LCD indicates that the
high current loop mode is selected by displaying the
symbol.
2. Connect the red lead to the L (red) and the blue lead to the N (blue)
terminals of the tester.
3. Press
to select L-N.
4. Press
to select between
and m
resolution for the test results.
The m
resolution test takes between 30 and 60 seconds to
complete.
5. Use the zero adapter to zero the test leads or the mains cord.
6. Press and hold
for more than two seconds until the ZERO
annunciator appears.
The tester measures the lead resistance, stores the reading in
memory, and subtracts it from readings. The resistance value is saved
even when the power is turned off so it is unnecessary to repeat the
operation each time you use the tester with the same test leads or
mains cord.
Note
Be sure the batteries are in good charge condition before you zero the
test leads.