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MI 3108 EurotestPV Safety and operational considerations
10
RCD trip-out time and RCD trip-out current measurements will only be performed
if the contact voltage in the pre-test at nominal differential current is lower than
the set contact voltage limit!
The autotest sequence (RCD AUTO function) stops when trip-out time is out of
allowable time period.
Z-LOOP
The low limit prospective short-circuit current value depends on fuse type, fuse
current rating, fuse trip-out time and impedance scaling factor.
The specified accuracy of tested parameters is valid only if the mains voltage is
stable during the measurement.
Fault loop impedance measurements will trip an RCD.
The measurement of fault loop impedance using trip-lock function does not
normally trip an RCD. However, the trip limit may be exceeded if a leakage
current flows to the PE protective conductor or if there is a capacitive connection
between L and PE conductors.
Z-LINE / Voltage drop
In case of measurement of ZLine-Line with the instrument test leads PE and N
connected together the instrument will display a warning of dangerous PE
voltage. The measurement will be performed anyway.
Specified accuracy of tested parameters is valid only if mains voltage is stable
during the measurement.
L and N test terminals are reversed automatically according to detected terminal
voltage (except in UK version).
Power / Harmonics / Energy / Current
Before starting any Power measurement the current clamp settings in Settings
menu should be checked. Select appropriate current clamp model and
measuring range that are best fitted to the expected current values.
Consider polarity of current clamp (arrow on test clamp should be oriented
toward connected load), otherwise result will be negative!
PV measurements
A 1384 PV Safety Probe must be used for PANEL, UOC/ISC, I/V, INVERTER
(AC, DC) and ISO PV measurements.
A 1385 PV test lead must be used for INVERTER AC/DC measurements.
Before starting a PV measurement the settings of PV module type and PV test
parameters should be checked.
Environmental parameters (Irr, T) can be measured or entered manually.
Environmental conditions (irradiance, temperature) must be stable during the
measurements.
For calculation of STC results measured Uoc / Isc values, irradiance, cell
temperature, and PV module parameters must be known. Refer to Appendix E
for more information.
Always perform zeroing of DC current clamps before test.
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