Resistance Measurements - Extech Instruments MA160 User Manual

Resistance Measurements
CAUTION: 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 continuity/diode/capacitance icons showing).
4. 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.
5. 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.
Resistance Measurement Notes:

The display will show "OL" when an open circuit is detected or if the resistance > maximum
range.

The test leads introduce an error of approx. 0.1Ω～0.2Ω for low resistance measurements.
Use the Relative mode to obtain accurate readings. Short the test leads together, press the
REL button, and then measure a low resistance. The meter subtracts the short‐circuit value
from the reading.

If the test lead resistance of probe is > 0.5Ω when shorted, inspect the test leads and the
connection.

It may take several seconds for the reading to stabilize when measuring resistance >1MΩ.
This is normal operation.

For personal safety, do not measure a circuit with voltages > 30V DC or AC.
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Fig 4‐5 RESISTANCE MEASUREMENTS
14
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