Dc Current Measurements - Extech Instruments EX530 User Manual

DC/AC MILLIVOLT MEASUREMENTS
CAUTION: Do not measure DC/AC voltages if a motor on the circuit is being switched
ON or OFF. Large voltage surges may occur that can damage the meter.
1. Set the function switch to the green mV DC-AC position.
2. Insert the black test lead banana plug into the negative COM
jack.
Insert the red test lead banana plug into the positive V jack.
3. Press the MODE button to select "DC" or "AC" millivolts.
4. 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.
5. Read the voltage in the display.

DC CURRENT MEASUREMENTS

CAUTION: Do not make 20A current measurements for longer than 30 seconds.
Exceeding 30 seconds may cause damage to the meter and/or the test leads.
1. Insert black test lead banana plug into the negative COM jack.
2. For current measurements up to 6000µA DC, set the function
switch to the yellow µA position and insert the red test lead banana
plug into the µA/mA jack.
3. For current measurements up to 600mA DC, set the function switch
to the yellow mA position and insert the red test lead banana plug
into the µA/mA jack.
4. For current measurements up to 20A DC, set the function switch to
the yellow 10A/HZ/% position and insert the red test lead banana
plug into the 10A jack.
5. Press the MODE button to indicate "DC" on the display.
6. Remove power from the circuit under test, then open up the circuit
at the point where you wish to measure current.
7. 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.
8. Apply power to the circuit.
9. Read the current in the display.
7 EX530-EU_ENG V3.4 1/08