MI 2142 AlphaPAT Instrument description
10
2.4 Safety
pre-tests
The instrument makes pre-tests before a regular test of connected appliance to ensure
safety and to prevent any damage. These safety pre-tests check for:
any external voltage against earth on test socket and test probe,
too high leakage current,
too high touch leakage current,
short circuit or too low resistance between L and N on appliance,
correctly applied mains voltage to the test socket and
if the 110V adapter is used.
If pre-test fails, an appropriate warning message will be displayed.
The warnings and measures that have to be taken are described in chapter
2.5
Meaning of symbols and messages on the instrument display
.
2.5 Meaning of symbols and messages on the instrument
display
MAINS VOLTAGE IS
NOT CORRECT OR
PE NOT CONNECTED!
Check mains voltage
and PE connection!
Improper supply voltage warning.
Determine and
eliminate the problem before proceeding!
Check for
incorrect wiring on wall socket. Possible causes:
no earth connection,
incorrect mains voltage.
L and N are crossed.
Press Start key to
continue.
The instrument works normally also in the case when L
and N are interchanged. Pay attention to wrong polarity of
line and neutral wires on test socket.
L-N RESISTANCE TOO
HIGH (>30k
Ω
)!
Are you sure to
proceed?
YES
NO
Too high resistance was measured in the fuse pre-test.
Indication means that appliance has too low consumption
or is:
not connected,
switched off.
Select
YES
or
NO
with or key and press Enter key to
confirm.
L-N RESISTANCE TOO
LOW (<20.0
Ω
)!
Are you sure to
proceed?
YES
NO
It is very likely that too high current will flow after applying
power to the tested appliance. If the too high current is
only of short duration (caused by the short inrush current)
the test can be performed, otherwise not.
Select
YES
or
NO
with or key and press Enter key to
confirm.
