CEM DT-9560, Руководство по эксплуатации, Страница: 10 / 28

10
True RMS Autoranging Digital Multimeter
4-2.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
VAC position. Indicate “ AC ” on the display.
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 display.
5. Press and hold the
MODE button key for 2 seconds to indicate “ VFD ” on the display.
6. Read the VFD value in the display.
7. To exit VFD mode press and hold the
MODE button for 2 seconds.
8. Press the HZ/% button to indicate “ Hz ”.
9. Read the frequency in the display.
10. Press the
Hz/% button again to indicate “ % ”.
11. Read the % of duty cycle in the display.
RANGE
MODE
REL
Hz%
HOLD
MAX
MIN
OFF
Ω
CAP
mA
Auto Power Off
10A
mA
μ A
10A
V
FUSED
MAX
800mA
COM
CAT IV 600V
CAT III 1000V
Hz
%
Hz%
Hz%
Hz%
Hz%
mV
Hz%
True RMS Autoranging Digital Multimeter
V
VFD
VFD
V Ω CAP
Hz%
30 sec MAX
every 15 min