Ac Current Measurements; Resistance Measurements - Extech Instruments AUT500 User Manual

AC CURRENT MEASUREMENTS

CAUTION: Do not make current measurements on the 20A scale 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 400mA AC, set the function switch
to the mA position and insert the red test lead banana plug into the
400mA jack.
3. For current measurements up to 20A AC, set the function switch to
the 20A range and insert the red test lead banana plug into the 20A
jack.
4. Press the MODE button to indicate "AC" on the display.
5. Remove power from the circuit under test, then open up the circuit
at the point where you wish to measure current.
6. Touch the black test probe tip to the neutral side of the circuit.
Touch the red test probe tip to the "hot" side of the circuit.
7. Apply power to the circuit.
8. Read the current in the display as numerical digits and as bar-graph
representation.

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.
1. Set the function switch to the Ω position.
2. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive  jack.
3. Press the MODE button to indicate ""on the display.
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.
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