Ac Voltage Measurements; Dc Current Measurements - Extech Instruments EX430A User Manual

AC VOLTAGE MEASUREMENTS

1. Set the function switch to the green V position.
2. Press the SELECT button to indicate "AC" on the display.
3. Insert the black test lead banana plug into the negative COM jack.
4. Touch the black test probe tip to the neutral side of the circuit.
5. Read the voltage in the display.

DC CURRENT MEASUREMENTS

1. Insert the black test lead banana plug into the negative COM jack.
2. For current measurements up to 4000µA DC, set the function switch to
3. For current measurements up to 400mA DC, set the function switch to
4. For current measurements up to 10A DC, set the function switch to the
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
7. Touch the black test probe tip to the negative side of the circuit.
8. Apply power to the circuit.
9. Read the current in the display.
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WARNING: Risk of Electrocution. The probe tips may not be long enough to contact the live parts
inside some 240V outlets for appliances because the contacts are recessed deep in the outlets. As
a result, the reading may show 0 volts when the outlet actually has voltage on it. Make sure the
probe tips are touching the metal contacts inside the outlet before assuming that no voltage is
present.
CAUTION: Do not measure AC voltages if a motor on the circuit is being switched ON or OFF.
Large voltage surges may occur that can damage the meter.
Insert red test lead banana plug into the positive V jack.
Touch the red test probe tip to the "hot" side of the circuit.
CAUTION: Do not make current measurements on the 10A scale for longer than 30 seconds.
Exceeding 30 seconds may cause damage to the meter and/or the test leads.
the yellow µA position and insert the red test lead banana plug into the
µA/mA jack
the yellow mA position and insert the red test lead banana plug into the
µA/mA jack.
yellow 10A range and insert the red test lead banana plug into the 10A
jack.
point where you wish to measure current.
Touch the red test probe tip to the positive side of the circuit.
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