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Electrical Installation Tester
Measur ements
37
Loop Impedance (High-Current Trip Mode)
To measure loop impedance—high-current trip mode:
If no RCDs are present in the system under test, you can use the high-current
Line Earth (L-PE) loop impedance test.
1. Turn the rotary dial to the
position. The shows on the display
to indicate that high-current trip mode is selected.
2. Connect the leads to the L and PE (red and green) terminals of the Tester.
3. Press to select L-PE or L-N.
4. 1664 FC only, press to select between and m resolution for the test
results. The m resolution test takes between 30 seconds and 60 seconds
to complete.
5. Zero the test leads. For a Loop (Z
I
) test, check that all 3 leads are shorted.
6. More information about how to zero the test leads is on page 22.
6. For 1663 and 1664 FC only, press to toggle the Zmax monitor.
If Zmax is turned on, consecutive measurements are compared. The
secondary display shows the maximum Z
L
(or Z
I
if F1 = L-N) value until
Zmax is turned off. The Zmax value is saved when you save the test result.
If you change the location fields a, b, or c before you save, the actual test
result is the new Zmax. The Tester retains the Zmax value between the Z
I
No Trip and Z
I
Hi Current tests.
7. Connect the leads to the L and PE of the system under test or connect the
mains test cord to the socket under test.
8. Touch the touch pad and watch the front panel for the W warning.
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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