Megger LRCD200 series, User Manual

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2. Supply voltage is displayed.
3. Press the [TEST] key.
4. After a test period of up to 20 seconds the measured loop value is
displayed.
Hi current loop test
[Hi]
LRCD220 only
The [Hi] Loop test performs a 2-wire loop test, provides a rapid loop test,
designed for non-RCD protected circuits.
Note:
During all [Hi] tests the BLACK neutral test lead should be
connected to the same connection point as the GREEN earth test lead.
Range selection:
1. Set the instrument to the [ Hi ] Loop test range. A Hi current loop test
is confirmed on the display with the symbol , which indicates the
possibility of tripping an RCD if fitted.
Phase-Earth loop impedance (not at a power socket)
Testing:
1. Connect the Red/Green lead set or the 3-wire test lead to the
instrument.
2. Connect the RED [L1] lead to PHASE and the GREEN [L0] lead to
EARTH (Black lead - connect the Black lead to the Green lead)
3. The supply voltage is displayed.
4. Press the [TEST] button to start a loop test.
5. After a short delay the measured loop value is displayed.
If desired the test can be repeated by pressing the [TEST] button.
LOOP TESTING
12
Two loop testing options are available: [No Trip] on the LRCD200/210 and
[Hi] test on the LRCD220.
Non-tripping loop test [No Trip]
Earth loop impedance measurement (at a power socket):
The [No Trip] range is a high resolution (0,01 ohm), low test current earth
loop resistance measurement range. It requires a connection to neutral,
but allows quick and accurate measurement of the earth loop resistance
without tripping all RCDs with a rated current 30 mA or higher.
To perform a [No-Trip] loop test:
Range selection:
1. Select the [No Trip] test range. A non-trip loop test is confirmed on the
display with the symbol
Testing:
1. Connect the mains plug test lead to the instrument.
2. Insert the plug into an installation socket.
3. Supply voltage is displayed.
4. Press the [TEST] key.
5. After a test period of up to 20 seconds the measured loop value is
displayed.
If desired the test can be repeated by pressing [TEST] again.
Using the three wire lead set
The [No Trip] loop test can be carried out where a power socket is not
available using the three wire lead set.
1. Connect the RED lead to Phase, BLACK lead to neutral and GREEN lead
to earth.