EXTECH INSTRUMENTS
9
MA610-en-GB_V1.0 12/16
Resistance Measurements
WARNING: Please remove power to the circuit under test and discharge all capacitors
before taking resistance or continuity measurements. The meter will display OL if the circuit
under test is an open circuit or if the measurement exceeds the maximum range of the meter.
Do not input a voltage >30V AC or DC.
1.
Turn the function switch to the Resistance Ω position.
2.
Use the M (mode) button to select the ohm Ω display symbol.
3.
Insert the black test lead banana plug into the negative (COM) jack. Insert the red test
lead banana plug into the red (Ω) jack. See Fig. 4.
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 that the rest of the circuit will not interfere with the
resistance reading.
5.
Read the resistance in the display. The display will indicate the proper decimal point and
value.
6.
Relative (REL) mode can be used to set a reference reading from which subsequent
readings will be offset (reference reading – actual reading = displayed reading). Short
press the REL button to store the displayed reading. The Relative icon (triangle) appears
when the Relative mode is active. Short press the REL button to exit the relative mode.
NOTE: When measuring resistance >1MΩ the meter may require several seconds to obtain a
stable reading.
Fig. 4 – Resistance Measurements
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