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3.1.3. Using the 50/60 and Wide Selector33.1.3. 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 to
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 and wide position to see the difference. If the
reading is very different, it is certain that the high frequency signals or harmonics present.
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