Fluke 1650B [29/62] Line impedance

Electrical Installation Tester

Making Measurements

PE (Green)

L (Red)

N (Blue)

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Figure 12. 3-Wire Connection for Earth Resistance Loop Test

To measure earth resistance using the loop test no trip mode:

1. Turn the rotary switch to the

y position.

2. Press 1 to select L-PE.

3. Press 3 to select R

(resistance).

4. Press and release T. Wait for the test to complete.

• The primary (upper) display shows the loop impedance.

• The secondary (lower) display shows the earth resistance.

Line Impedance

Line impedance is source impedance measured between Line conductors or

Line and Neutral. This function allows the following tests:

• Line to Neutral loop impedance.

• Line to Line impedance in 3-phase systems.

• 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.