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% 4 – 20mA MEASUREMENTS
1.
Set up and connect the meter as described for DC mA measurements.
2.
Set the rotary function switch to the 4-20mA% position.
3.
The meter will display loop current as a % with 0mA=-25%, 4mA=0%, 20mA=100%, and
24mA=125%.
INSULATION RESISTANCE MEASUREMENTS
Note: Disconnect the unit under test from all power sources and isolate it from any stray
resistance.
1.
Set the rotary function switch to the INSULATION position
2.
Press the RANGE button to select the test voltage as indicated on the top left display.
3.
Connect the red test lead to the meter's INSULATION ( + ) jack and the black test lead to the
INSULATION ( - ) jack. Connect the probe end of the test leads to the circuit under test.
4.
Press and hold the TEST button to test (alternatively, press and hold the LOCK key until the
display shows LOCK and then momentarily press the TEST button to start a hands free test).
Note: If the circuit under test is live and has a voltage potential (AC/DC) over 30V, the meter it
will not test (the display will show ">30V", the
the circuit under test is not live or if its voltage is less than 30V, the meter will begin applying
high-voltage to the circuit under test.
5.
The primary display and the analog bargraph will show the insulation resistance in MΩ.
6.
The test voltage (VDC) value will be indicated in the right-most auxiliary display, the
will flash and the caution buzzer will sound.
7.
Release the TEST button to stop the test (to stop a hands free LOCK test, press and hold the
release button for 2 seconds). The high voltage will switch off and the resistance values
indicated in the primary display hold.
8.
Subsequently, the meter will internally discharge the balance of the insulation test voltage.
Note: Turning the function switch to another test position or pressing the EXIT button will abort an
Insulation resistance test.
RANGE
10
symbol will flash, and the buzzer will sound). If
symbol
MG302-en-GB_v2.4 6/16
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