Ac Current (Frequency, Duty Cycle) Measurements - PCE Instruments PCE-ITM 20 User Manual

3.5

AC Current (Frequency, Duty Cycle) Measurements

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.
• Insert the black test lead banana plug into the negative COM
jack.
• For current measurements up to 5000μA AC, set the function
switch to the yellow μA position and insert the red test lead
banana plug into the μA/mA jack.
• For current measurements up to 500mA AC, set the function
switch to the yellow mA position and insert the red test lead
banana plug into the μA/mA jack.
• 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.
• Press the MODE button to indicate "AC" on the display.
• Remove power from the circuit under test, then open up the
circuit at the point where you wish to measure current.
• 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.
• Apply power to the circuit.
• Read the current in the display. In the 10A AC range, the right
auxiliary displays frequency.
• Press and hold the MODE button to indicate "Hz".
• Read the frequency in the display.
• Momentarily press the MODE button again to indicate "%".
• Read the % duty cycle in the display.
• Press and hold the MODE button to return to current
measurement.
• Press EXIT for 2 seconds into the function of AC+DC. Test
DC and AC TRUE Rms.
• When uAac>2mA, mAac>2mA, 10Aac >0.2A, the current
frequency can be read synchronously in the right auxiliary
display.
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