Ac / Dc Current Measurements; Resistance Measurements - Extech Instruments EX310-NIST User Manual

AC / DC CURRENT MEASUREMENTS

CAUTION: Do not make current measurements at 10 Amps for longer than 30 seconds.
Exceeding 30 seconds may cause damage to the meter and/or the test leads.
1. Insert the black test lead banana plug into the negative COM jack.
2. For current measurements up to 200mA AC or DC, set the function switch to the 200m AAC or
ADC position and insert the red test lead banana plug into the mA jack.
3. For current measurements up to 10A AC or DC, set the function switch to the 10A AAC or 10A
ADC position and insert the red test lead banana plug into the 10A jack.
4. Remove power from the circuit under test, then open up the circuit at the point where you wish
to measure current.
5. 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.
6. Apply power to the circuit.
7. Read the current 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.
Set the function switch to the highest 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.
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. Move the function switch to
successively lower Ω positions to obtain a higher resolution reading.
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