Continuity Measurements - Extech Instruments MG325 User Manual

6.7 CONTINUITY MEASUREMENTS

WARNING: To avoid electric shock, disconnect power to the unit under test and discharge all capacitors
before taking continuity measurements. Remove the batteries and unplug the line cords.
WARNING: To avoid electric shock, never measure continuity on circuits or wires that have a voltage.
1. Set the function switch to the
2. Insert the black test lead banana plug into the negative
COM jack (5).
Insert the red test lead banana plug into the positive
jack (4).
3. Press the TEST button on the meter (or on the test leads, if
using the test lead with the TEST button) to put the meter
in test mode. The display will show TEST and the alert
LED will light.
4. The meter defaults to test lock mode (lock icon displayed)
so the test will run without having to hold TEST. Press and
hold the lock button to change to manual test mode (TEST
button must be held throughout the test).
5. 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.
6. Touch the test probe tips across the circuit or part under
test.
7. If the continuity buzzer is turned on in the SETUP mode,
the buzzer will sound if the resistance <30. Read the
resistance in the main display and with the lower bargraph.
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 and 'UE HI TEST' will display.
9. If the 'FU FAIL' prompt appears, the fuse must be replaced before use (see the Maintenance
section for fuse and battery replacement information).
10. Short press the H (Hold) button to freeze (H icon displayed) or unfreeze (no H icon displayed)
the displayed reading.
11. Press
12. Note that the Auto Power OFF function activates after 10 minutes of inactivity. The meter will
audibly beep just prior to shutting off.
position.
to store the reading
10
TEST
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MG325-en-GB_v1.1 3/16
mA