KYORITSU KEW 2413F - ５−４ How to Use the Frequency Selector Switch


16

５−４ How to Use The Frequency Selector Switch
KEW 2413 F 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 50 Hz or
60 Hz, but ofhigh frequenciesandharmonicssuperimposedonthe
fundamental frequency. To eliminate these superimposed components
and measure only in the fundamental frequency, KEW 2413 F has a
Low passfilter circuit, whichcan be activated by activated by setting
thefrequencyselectorswitchtothe' 50 / 60 Hz'position.
The Low pass filter has a cut-off frequency of approx. 100 Hz and an
attenuationcharacteristicsofapprox. − 24 dB/octave.
Note ：  − 24 dB/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( 40 Hz − over 1 kHz):
Coversawidefrequencybandfrommainssupplytohighfrequencies
generatedbysuchequipmentasinverters.
● 50 / 60 Hz( 40 − Approx. 100 Hz):
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.