KYORITSU 2413F - Manual (Page 18)

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５−４ How to Use The Frequency Selector Switch
KEW SNAP 2413F has a very good frequency response because of the
electromagnetic property of its transformers jaws. Therefore, it
measured, AC current not only of fundamental frequency of 50Hz or
60Hz, but of high frequencies and harmonics superimposed on the
fundamental frequency. To eliminate these superimposed components
and measure only in the fundamental frequency, KEW SNAP 2413F
has a high-cut filter circuit, which can be activated by activated by
setting the frequency selector switch to the '50/60Hz' position.
The high-cut filter has a cut-off frequency of approx. 100Hz and an
attenuation characteristics of approx.
−24 dB/octave.
Note ：−24dB/octave means that the magnitude of a signal declines by
a factor of 16 when its initial frequency doubles.
The frequency selector switch has the following two positions.
●WIDE(40Hz−over 1kHz):
Covers a wide frequency band from mains supply to high frequencies
generated by such equipment as inverters.
●50/60Hz(40−Approx.100Hz):
Filters out high frequency components to restrict measurement in
mains frequency band.
Note ：Selection with the frequency selector switch dose not apply to
AC output of the two-way analogue output. DC output of the two-
way analogue output reflects the frequency selector switch
setting. Refer to Figure. 1 for frequency characteristics.