CEM DT-9929, Руководство пользователя

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11
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 4000µA 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 400mA 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. In the 10AAC range, right
auxiliary display frequency.
10. Press and hold the MODE
button to indicate “
Hz
”.
11. Read the frequency in the display.
12. Momentarily press the MODE button a
gain to indicate “
%
”.
13. Read the % duty cycle in the display.
14. Press and hold the MODE button to return to current
measurement.
15. Press EXIT for 2 seconds into the function of AC+DC. Test DC
and AC TURE Rms.