1652C/1653B/1654B
Users Manual
22
Note
Be sure the batteries are in good charge condition before you zero the
test leads.
4. Press and hold
until the reading settles. If the continuity beeper is
enabled, the tester beeps continuously for measured values less than 2
Ω
and there is no stable reading beep for measured values greater than 2
Ω
.
If a circuit is live, the test is inhibited and the AC voltage appears in the
secondary (lower) display.
Extended Documentation Mode
In the Extended Documentation mode, the Tester stores the measurement
result with the measurement location: R1+R2, R2, r1, r2 or rn. You can select
the information before or after the measurement with
. The definitions are:
R1+R2 = Rx1/2, R2 = R/2, r1 = x1, r2 = /2, rn = x5.
Measuring Loop/Line Impedance
apx006f.eps
Figure 11. Loop/Line Impedance/Switch and Terminal Settings
Loop Impedance (Line to Protective Earth L-PE)
Loop impedance is source impedance measured between Line (L) and
Protective Earth (PE). You can also ascertain the Prospective Earth Fault
Current (PEFC) that is the current that could potentially flow if the phase
conductor is shorted to the protective earth conductor. The tester calculates the
PEFC by dividing the measured mains voltage by the loop impedance. The
loop impedance function applies a test current that flows to earth. If RCDs are
present in the circuit, they may trip. To avoid tripping, always use the Zl No Trip
function on the rotary switch. The no trip test applies a special test that
prevents RCDs in the system from tripping. If you are certain no RCDs are in
the circuit, you can use the Zl Hi Current function for a faster test.
