Resistance Measurements - Extech Instruments EX350 User Manual

Resistance Measurements
Cautions: Switch OFF power to the device under test before measuring. Do not test on circuits
or devices where 60VDC or 30VAC is present.
1. Insert the black test lead banana plug into the negative (COM) jack. Insert the red test
lead banana plug into the positive (V/Ω) jack.
2. Turn the Function Switch to the Ω position.
3. Use the M button to select the Ω icon on the display indicating resistance only (without
the audible continuity icon showing).
4. The meter defaults to the Auto Range mode (Auto displayed on LCD). Press the R button
to access the manual range mode. Press the R button to step through the ranges. Press
and Hold the R button to return to the Auto Range mode (Auto will be displayed).
5. Touch the test probe tips across the circuit or part under test. It is best to disconnect one
side of the part under test so the rest of the circuit will not interfere with the resistance
reading.
6. Read the resistance value in the display. The display will indicate the proper decimal
point and value. If the reading is out of range, the OL display icon will appear.
Fig 4‐6 RESISTANCE/CONTINUITY MEASUREMENTS
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