CEM DT-9929, Руководство пользователя

Страница: 9 / 28

8
AC VOLTAGE (FREQUENCY, DUTY CYCLE) MEASUREMENTS
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.
1. Set the function switch to the green
VAC/Hz/% position.
2. Insert the black test lead banana plug into
the negative COM jack.
Insert red test lead banana plug into the
positive
V jack.
3. 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.
4. Read the voltage in the main display and the
frequency in the right auxiliary display
5. Press the MODE
button to indicate “
Hz
”.
6. Read the frequency in the main display.
7. Press the MODE
button again to indicate “
%
”.
8. Read the % of duty cycle in the main display.
9. Press EXIT for 2 seconds into the function of AC+DC. Test DC
and AC TURE Rms.