MPI-536 – USER MANUAL
3.5 Voltage drop
This function determines the voltage drop between two points of the tested network, selected by the
user. The test is based on measurement of fault loop impedance L-N at these points. In a standard
network, usually the voltage drop is tested between the socket and the switchgear (reference point).
The voltage drop is calculated according to the following formula:
where:
Z – fault loop impedance at the destination point,
Z
REF
– fault loop impedance at the reference point,
I
N
– rated fuse current
U
N
– rated mains voltage.
Select item ΔU.
Use setting Zref= --- to reset
previous measurement, if it has
not been done yet.
Enter the limit of voltage drop
ΔU
MAX
.
Enter the fuse type, which pro-
tects the tested circuit.
Connect the meter to the reference point of the tested network, as for Z
L-N
measurement
Press START.
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