KYORITSU KEW 2413F - Page 17

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Note 2 ： Ifitisnecessarytoreadthedisplayawayfromtheconductor
inapeakholdmeasurement,pressthedataholdswitch( 2 )
firstandthen remove the instrument fromtheconductor.
Otherwise,the peak hold reading maybe higherthan the
actual valueduetotheelectricalnoisecausedbythe
openingandclosingofthetransformerjaws.Pressthedata
holdswitchagainforareset.
( 4 )Differencebetween 10 msand 100 msPeakResponseTime
The peak hold circuit inthisinstrument charges thepeak-hold
capacitorafterrectifyingtheinputwaveform.Thetimeforthevoltage
ofthecapacitortoreach itspeakvaluevariesaccordingtoits
capacitanceandtheoutputimpedanceofthechargingcircuit.KEW
2413 Fsetsthetimeforthevoltageofthecapacitortoreach 90 %of
its peakvalue to 10 ma or 100 ms byswitching between two output
impedances.RefertoFigure 7 forfurtherdetails.
I
For instance, select the 10 ms response time when measuring a surge
currentthatwilloccurwhenapowersupplydeviceisswitchedon.The
100 ms responsetimeisrecommendedformeasuring thestarting
currentofa motororsimilarequipment. Astablemeasurementcan be
madeon the 100 mssecond response timesetting as thepeak hold
circuitdoesnotreadilyrespondtothesurgecurrent.