Major tech MT390 - Tester Operation Guide (cont. 2); Low Ohm & Continuity Display; Earth Resistance (RE) Display; Insulation Display Details

: Low Battery
: Indicates high temperature and therefore cannot make any measurements
Half: Appears during the auto test when rcd has operated on the x ½ test
Half Trip: Appears during the manual test when rcd has operated on the x ½ test
UL OVER: Appears when UF voltage exceeds the previously set UL voltage. (UL voltage can be set to 25V
or 50V) The user must check the impedance between L-PE
5.1.4-Displayed icons (symbols) and messages when using the LOW OHM and CONTINUITY functions
: Indicates correct input terminal connectivity. The user should connectthe test leads to
the appropriate terminals indicated by color coding.
: Low Battery (The icon will be flashing along with the beep sound).
: The resistance of the test leads are included in the test measurement
: The resistance of the test leads are not included in the test measurement
5.1.5-Displayed icons (symbols) and messages when using the RE functions
: Indicates correct input terminal connectivity. The user should connect the test leads to
the appropriate terminals indicated by color coding.
: Low Battery (The icon will be flashing along with the beep sound).
: The resistance of the test leads are included in the test measurement
: The resistance of the test leads are not included in the test measurement
-
: the test leads to
the appropriate terminals indicated by color coding.
4
t
:
3
Message:
Symbol:
-
-
5.1.6 Displayed icons(symbols) and messages in INSULATION function
Indicates correct input terminal connectivity. The user should connect
: Low Battery (The icon will be flashing along with the beep sound).
: Indicates high voltage (125V, 250V,500V or 1000V) at probe terminals, Use caution
Before you do a loop impedance test, use the zero adapter to zero the test leads or the mains cord. Press
and hold F button for more than two seconds until the annunciator appears. The tester measures
the lead resistance, stores the reading in memory, and subtracts it from readings. The resistance value is
saved even when the power is turned off so it is unnecessary to repeat the operation each time you use the
ester with the same test leads or mains cord.
Be sure the batteries are in good charge condition before you zero the test leads.
You can select UL Voltage by Pressing and hold F button for more than two seconds (25V or 50V).
5.2-Using the LOOP/PFC Function
1
2
Note
UL OVER:
:
:
:
1
1
1
1
-
-
-
-
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Multifunction Tester User Manual