Resistance Measurements - Extech Instruments MA61 User Manual

DC Voltage Measurements
1. Insert the black test lead banana plug into the negative (COM) jack and the red test lead
banana plug into the positive (V/Ω) jack.
2. Move the Function Switch to the V position.
3. Press the MODE button to select DC if necessary.
4. Touch the test probe tips to the circuit under test. Be sure to
observe the correct polarity (red lead to positive, black lead to
negative).
5. Read the voltage in the display. The display will indicate the
proper decimal point and value. If the polarity is reversed, the
display will show (‐) minus before the value.
6. The meter is capable of detecting DC voltages to 600V.
7. When voltage is measured, the NCV voltage detect LED will be
lit.
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 MODE button to select the Ω icon on the display
indicating resistance only (without the audible continuity
icon 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 in the display. The display will indicate
the proper decimal point and value.
Fig‐6 DC VOLTAGE MEASUREMENT
Fig‐7 RESISTANCE MEASUREMENT
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