HT instruments М75 - Manual (Page 37)

M72 - M73 - M74 - M75
EN - 35
4.15.1. Anomalous cases which may occur during Ra tests
1. If during measurement the RCD
protecting the line trips, the instrument
interrupts the test and emits a prolonged
sound to signal the anomalous situation.
The screen beside is displayed for 5
seconds after which the instrument
displays the default screen of Ra test
2. If during measurement a higher input
voltage than 265V is detected (for
example, if both cables connected to
phase conductors of a 400V three-phase
plant) the instrument does not perform
the test and emits a prolonged sound to
signal the anomalous situation. The
screen beside is displayed for 5 seconds
after which the instrument displays the
default screen of Ra test
3. If during measurement a lower input
voltage than 110V is detected, the
instrument does not perform the test and
emits a prolonged sound to signal the
anomalous situation. The screen beside
is displayed for 5 seconds after which the
instrument displays the default screen of
Ra test. This can happen for example
if the black cable is erroneously
connected to the neutral conductor
instead of the phase one. If a Shuko
cable is used, rotate the plug and repeat
the test