Ac Current Measurements - Extech Instruments 411 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 200mA AC, set the function
switch to the highest 200mA AC (
red test lead banana plug into the mA jack.
3. For current measurements up to 20A AC, set the function
switch to the 20A AC range
and insert the red test lead
banana plug into the 20A
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 neutral side of the
circuit.
Touch the red test probe tip
to the "hot" side of the circuit.
6. Apply power to the circuit.
7. Read the current in the
display.
) position and insert the
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