Dc Voltage Measurements; Resistance Measurements - Extech Instruments MN47 User Manual

DC VOLTAGE MEASUREMENTS

CAUTION: Do not measure DC voltages if a motor on the circuit is being switched ON or OFF.
Large voltage surges may occur that can damage the meter.
1. Set the function switch to the V
2. Insert the black test lead banana plug into the negative COM jack. Insert the
red test lead banana plug into the positive V jack.
3. Touch the black test probe tip to the negative side of the circuit. Touch the
red test probe tip to the positive side of the circuit.
4. Read the voltage in the display.

RESISTANCE MEASUREMENTS

WARNING: To avoid electric shock, disconnect power to the unit under test and discharge all
capacitors before taking any resistance measurements. Remove the batteries and unplug the line
cords.
Set the function switch to the Ω position.
1.
2. Insert the black test lead banana plug into the negative COM jack. Insert the
red test lead banana plug into the positive Ω jack.
3. Touch the test probe tips across the circuit or component under test. It is
best to disconnect one side of the circuit under test so the rest of the circuit
will not interfere with the resistance reading.
4. Read the resistance in the display.
position.
DC
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