Fluke 1672 - Zmax; Auto Start; Loop Impedance Test with 10 Ma RCD

Multifunction Tester
Applications
55
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.
Zmax has a toggle on/off switch. 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
I
No Trip
 L-N: Z
I
Zmax is in use
 L-PE: both Z
I
Zmax and Zmax are in use
 Z
I
Trip (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.
Auto Start
Auto Start enables faster testing. When the Tester detects mains voltage in the loop/line or
RCD tests, the test starts automatically without pushing
T.
Loop Impedance Test with 10 mA RCD
For a Loop impedance measurement in a 10 mA RCD circuit, Fluke recommends the tripping
time RCD test. Use a nominal test current of 10 mA and the factor x ½ for this test.
If the fault voltage is <25 V or 50 V, dependent on the local requirement, the loop is good. To
calculate the loop impedance, divide the fault voltage by 10 mA (Loop impedance = fault
voltage x 100).