6
a. Set the rotary switch at desired range
b.P
ress the trigger to open the jaw and fully enclose all two wires
(single
phase, two wires), three wires(three phases, three wires), or four
wires(three phases, four wires).Make sure the two half jaws are
properly closed.
c.Read the measured value from the LCD display.
3. Using the 50/60 and wide Selector
50/60 position
This clamp meter has very good frequency response due to the electric
property of the transformer jaws used. Therefore, the measurement
result contains not only the fundamental frequency of 50/60Hz but also
the high frequencies and harmonics superimposed on the fundamental
frequency.
To eliminate the effect of high frequency noise, a low pass
filter is designed
t
o filter out high frequency signal. To enable the filter,
set the switch at the
50/60 position. The filter’s cut-off frequency is set
at 100Hz with an
attenuation characteristic of approx. 24dB/octave.
Wide position
If the circuit under test is originated from a high frequency generating
device such as inverter, switching regulators, etc., then the switch
should be set at wide position to measure the signal which contains the
frequency from 40Hz-1kHz.
To make sure the presence of high frequency signal, set the switch at
50/60
a
nd wide position to see the difference. If the reading is very
different, it
i
s certain that the high frequency signals or harmonics
present.
