MI 2087 Instaltest 61557
Measurement instructions
39
3.9. Fault Loop Resistance and Prospective Short-circuit
Current
For general information concerning the measurement, refer to enclosed handbook
Measurements on electric installations in practice and theory
.
How to carry out the measurement?
Step 1
•
Connect test cable (Plug commander or Universal test cable) to Instaltest 61557.
•
Set function switch to
R
LOOP
, Isc U
L-PE
position, L–PE voltage measurement
will start to run; see the figure below (left side):
Fig. 33.
L-PE voltage and frequency measurement
•
Check Frequency of mains voltage, pressing the
DISPLAY
key; see the figure
above (right side).
Step 2
•
Connect test cable
to tested object (mains outlet or other test terminals),
according to the figures below.
Mains
voltage not
connected!
