Extech Instruments MG310 User Manual page 8

ACCURACY SELF‐TEST FUNCTION
The MG310 features a 10MΩ accuracy check
feature for the Insulation Resistance mode.
To verify the accuracy:
1. Connect a wire jumper to the meter
between the LINE (4) and V (3)
terminals as shown in the
accompanying illustration.
2. Select one of the three test voltage
(250/500/100V) switch positions.
3. Press the TEST button to begin the test.
4. When testing is complete, the meter
will display 10.0MΩ (± 0.1MΩ). If the
meter does not show an accurate
reading please have it serviced.
LOW RESISTANCE CONTINUITY TESTING
WARNING: To avoid electric shock, never measure continuity on circuits or wires that have
voltage on them.
1. Set the function switch to the
(continuity) position.
2. Insert the black test lead banana plug
into the GUARD (2) jack.
Insert the red test lead banana plug into
the EARTH (1) jack.
3. Press the TEST button. The button lamp
will light indicating that testing can
begin.
4. Touch the test probe tips to the circuit
or wire you wish to check.
5. If the resistance is less than
approximately 20Ω, the audible signal
will sound and the audio icon will be
displayed. If the circuit is open, the
display will indicate > 220Ω.
6. Press the TEST button again to disengage the test mode (the lamp will switch off) before
removing the test leads from the circuit under test and from the meter.
8
M
.
MG310-en-GB_V1.0 12/15