Dc Current Measurements - Extech Instruments MN62 User Manual

DC/AC MILLIVOLT MEASUREMENTS
CAUTION: Do not measure DC/AC 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 mV position.
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. Press the SELECT button to select DC or AC millivolts.
4. 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.
(Figure at right shows DC measurement only).
5. Read the voltage in the display.
6. For AC, press the Hz/% button to indicate Hz.
7. Read the frequency in the display.
8. For AC, press the Hz/% button again to indicate %.
9. Read the % duty cycle in the display.
DC CURRENT MEASUREMENTS
CAUTION: Do not make 5A current measurements for longer than 30 seconds. Allow 15
minutes between tests. Exceeding 30 seconds may cause damage to the meter and/or the test
leads.
1. Insert black test lead banana plug into the negative COM
jack.
2. For current measurements up to 6000µA DC, set the
function switch to the µA position and insert the red test
lead banana plug into the µA/mA jack.
3. For current measurements up to 600mA DC, set the function
switch to the mA position and insert the red test lead
banana plug into the µA/mA jack.
4. For current measurements up to 10A DC, set the function
switch to the A position and insert the red test lead banana
plug into the 10A jack.
5. Press the SELECT button to indicate DC on the display.
6. Remove power from the circuit under test, then open up the
circuit at the point where you wish to measure current.
7. 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.
8. Apply power to the circuit.
9. Read the current in the display.
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