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550 V Phase to Phase applications (400 V @ 16 Hz).
Loop Testing
Select either the 20 Ω or 200 Ω measurement range
depending on:
1. The required measurement resolution 0.01 Ω (20 Ω range) or
0.1 Ω (200 Ω range).
2. The anticipated loop resistance.
3. The required test current taken from the Voltage/Resistance table
below.
Test current varies with supply voltage:
20 Ω range:
@ 550 V supply = 27 A
@ 230 V supply = 12 A
@ 115 V supply = 6.0 A
@ 50 V supply = 3 A
Phase-Earth loop measurement
This test is designed for non-RCD protected circuits.
The loop tester will operate over a supply voltage of: 50 V to
550 V (400 V @ 16 Hz).
1. Set the instrument to the 20 Ω range for 0.01 Ω resolution or the
200 Ω range for 0.1 Ω resolution. Display will show 000 V~
2. Connect the RED (PHASE) lead to the RED socket on the
instrument and the GREEN (EARTH) lead to the GREEN/BLUE
socket (alternatively use the Mains plug test lead Red and Green
connections).
3. Connect the RED lead to Phase and the GREEN lead to Earth (or
connect the mains plug to the wall socket).
4. The supply voltage is displayed and the appropriate system
frequency indicator displayed.
5. Within 5 seconds the loop test starts automatically and the
measured loop value is displayed.
The test can be repeated by pressing the [TEST] button.
Bonded Metalwork Testing
Repeat the above test but with the Green lead connected to the
exposed metalwork.
Phase-Neutral loop measurement
1. Connect the RED (PHASE) lead to the RED socket on the
200 Ω range:
@ 550 V supply = 2.7 A
@ 230 V supply = 1.2 A
@ 115 V supply = 0.6 A
@ 50 V supply = 0.3 A
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