Fluke 1650B [27/62] Warning

Electrical Installation Tester

Making Measurements

To measure loop impedance no trip mode:

XW Warning

To avoid tripping any RCDs in the circuit, always use the y

position for loop measurements.

1. Turn the rotary switch to the

y position.

2. Connect all three leads to the L, PE, and N (red, green, and blue)

terminals of the tester.

3. Press 1 to select L-PE. The display shows the Z

and

indicator.

4. Before you do a loop impedance test, use the zero adapter to zero the

test leads or the mains cord. Press and hold Z 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.

5. Connect all three leads to the L, PE, and N of the system under test or

plug the mains cord into the socket under test.

apx033f.eps

Figure 11. Display After Zeroing

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

The primary (upper) display shows the loop impedance.

7. To read the Prospective Earth Fault Current, press the 3 key and

select l

. The Prospective Earth Fault Current appears in amps or kilo

amps in the secondary (lower) display.

8. If the mains is too noisy, Err 5 will be displayed. (The measured value

accuracy is degraded by the noise.) Press the down arrow U to display

the measured value. Press the up arrow U to return to the Err 5

display.