METREL Instaltest 61557 MI 2087, Инструкция по эксплуатации

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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!