METREL MI 3122 User Manual

MI 3122 Smartec Z Line-Loop / RCD Testing RCD
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Loop resistance is indicative and calculated from Uc result (without additional proportional
factors) according to:
N
C
L
I
U
R


.
UK version
Figure 5.3: Example of contact voltage measurement results
Displayed results:
Uc ....... Contact voltage.
Rl ........ Fault loop resistance.
Rmax .. Maximum earth fault loop resistance value according to BS 7671.
5.1.2 Trip-out time (RCDt)
Trip-out time measurement verifies the sensitivity of the RCD at different residual currents.
Trip-out time measurement procedure
 Select the RCD function using the function selector switch.
 Set sub-function RCDt.
 Set test parameters (if necessary).
 Connect test cable to the top of the instrument.
 Connect test leads to the item to be tested (see figure 5.2).
 Press the TEST key to perform the measurement.
 Store the result by pressing the MEM key (optional).
Figure 5.4: Example of trip-out time measurement results
Displayed results:
t .......... Trip-out time,
Uc ....... Contact voltage for rated I
N
.

METREL MI 3122 Specifications

General

Brand	METREL
Model	MI 3122
Category	Multimeter
Language	English