Resistance Measurements - Extech Instruments MG325 User Manual

6.6 RESISTANCE MEASUREMENTS

WARNING: To avoid electric shock, disconnect power to the unit under test and discharge all capacitors
before taking 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
2. Insert the black test lead banana plug into the negative
EARTH jack (6).
Insert the red test lead banana plug into the positive  jack
(7).
3. Use the
button toggles Capacitance and Resistance modes).
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 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.
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 10 minutes of inactivity. The meter will
audibly beep just prior to shutting off.
k Ω position.
button to choose the Resistance mode (the
to store the reading
9
k
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