Low Resistance / Continuity Measurements - Extech Instruments MG320 User Manual

6.6 LOW RESISTANCE/CONTINUITY MEASUREMENTS
WARNING: To avoid electric shock, disconnect power to the unit under test and discharge all capacitors
before taking any resistance measurements. Remove the batteries and unplug the line cords.
WARNING: To avoid electric shock, never measure resistance on circuits or wires that have a voltage.
1. Set the function switch to the Ω position.
2. Insert the black test lead banana plug into the negative COM
jack (5).
Insert the red test lead banana plug into the positive
CONTINUITY jack (4).
3. Press the TEST button on the meter (or on the optional
remote test leads) to put the meter in test mode. The display
will show TEST and the front panel alert LED will light.
4. Reset the display to zero before testing: Short the test probes
and note the value. Short the test probes again and press and
hold ZERO until ZERO is displayed (0.00Ω reading when
successful). Press and hold ZERO again to exit.
5. Before testing, it is best to disconnect one side of the part
under test so that other circuits do not interfere with the
resistance reading.
6. Touch the test probe tips across the circuit or part under test.
7. Read the resistance in the main display.
8. If the circuit is open, the display will indicate ">". If 2V or more
are sensed on the device under test, the meter will stop the
test.
9. Short press the H (Hold) button to freeze (H icon displayed) or unfreeze (no H icon displayed)
the displayed reading.
10. Press
11. Note that the Auto Power OFF function activates after 3 minutes of inactivity. The meter will
audibly beep just prior to shutting off.
to store the reading
9
TEST
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