Ac Current (Frequency, Duty Cycle) Measurements; Resistance Measurements - Extech Instruments EX530 User Manual

AC CURRENT (FREQUENCY, DUTY CYCLE) 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 the black test lead banana plug into the negative COM jack.
2. For current measurements up to 6000µA AC, 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 AC, 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 AC, 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 "AC" 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 neutral side of the circuit.
Touch the red test probe tip to the "hot" side of the circuit.
8. Apply power to the circuit.
9. Read the current in the display.
10. Press and hold the MODE button to indicate "Hz".
11. Read the frequency in the display.
12. Momentarily press the MODE button again to indicate "%".
13. Read the % duty cycle in the display.
14. Press and hold the MODE button to return to current measurement.

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 green Ω
2. Insert the black test lead banana plug into the negative COM
jack.
Insert the red test lead banana plug into the positive Ω jack.
3. Press the MODE button to indicate "Ω" 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.
position.
8 EX530-EU_ENG V3.4 1/08