Ac Voltage Measurements; Dc Current Measurements - Extech Instruments EX410A User Manual

AC VOLTAGE MEASUREMENTS

1. Set the function switch to the highest V AC (
2. Insert the black test lead banana plug into the negative COM jack.
3. Touch the black test probe tip to the neutral side of the circuit.
4. Read the voltage in the display. Reset the function switch to successively

DC CURRENT MEASUREMENTS

1. Insert the black test lead banana plug into the negative COM jack.
2. For current measurements up to 200µA DC, set the function switch to the
3. For current measurements up to 200mA DC, set the function switch to the
4. For current measurements up to 10A DC, set the function switch to the
5. Remove power from the circuit under test, then open up the circuit at the
6. Touch the black test probe tip to the negative side of the circuit.
7. Apply power to the circuit.
8. 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.
lower V AC positions to obtain a higher resolution reading.
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.
200µA DC ( ) position and insert the red test lead banana plug into the
uA/mA jack.
200mA DC position and insert the red test lead banana plug into the
uA/(mA jack.
10A DC 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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