Electrical Installation Tester
Applications
59
G
R
L
hwl004.eps
Figure 14. 2-Wire Connection for Earth Resistance Loop Test
(High-Current Trip Mode)
Zmax
Zmax compares multiple line/loop impedances and retains the maximum
impedance. Sockets on a circuit can be tested consecutively and the maximum
impedance value retained and stored to memory.
There are two types of Zmax values: Zmax (L-PE) and Z
I
Zmax (L-N). The input
selection determines which Zmax value is in use:
• Z
L
No Trip
- L-N: Z
I
Zmax is in use
- L-PE: both Z
I
Zmax and Zmax are in use
• Z
L
Hi Current
- L-N: Z
I
Zmax is in use
- L-PE: Zmax is in use
The Zmax values are retained when you switch between Z
L
No Trip and
Z
L
Hi Current. Zmax values are saved with the test result to memory. If you
change the location fields a, b, or c before you save, the actual test result is the
new Zmax.
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