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Loop impedance / Prospective short-circuit current
measurement (Z
• According to EN 60204-1, the conditions for protection against electric
shock in installations with automatic disconnection of mains voltage are:
• Measurement or evaluation of fault loop impedance and testing the
over-current protection device involved in the fault loop.
• Limit values are shown in the Table 10 of EN 60204-1.
1) Set the measurement function selector (5) to Z
2) Use the "Im" menu key (14) to select appropriate measurement
current (20 A or LOW).
3) For limit value setting press the "LIM" menu key (14). The limit
value can be set by using the "+" and "-" menu keys.
4)
Connect test probes (or crocodile clips) to the unit under test,
present voltage will be displayed. If the value is within specified
range, the sign "READY" appears on the LC-display.
5) Start the measurement by pressing the "START/STOP" button (7),
or select automatic start and save function by pressing the "F:
AUT" menu key (14).
6)
Pilot lamp "ON" (8) indicates active measurement.
7)
Read the displayed result considering the appropriate limit value.
8) For display of short circuit current press the "I
9)
Stop the measurement by pressing the "START/STOP" button
again.
Z
MAN
AUT
F:
2
Figure 8: Measurement function Z
1 Display of measurement function, parameters, test lead
compensation mark and set limit value
2 "
AUT /
F:
start and store function
3 "Z / I
PSC
circuit current function
4 "Im" menu key, for selection of measurement current 20 A or
LOW
5 "LIM" menu key, for limit value setting
/I
function)
l
PSC
C
L 1.50Ω
20A
0.58
Ω
Z
Im
LIM
F:
3
4
5
MAN" menu key, for selection of automatic / manual
F:
" menu key, for selection of loop impedance or short
1
l
20
position.
l
" menu key (14).
PSC
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