KYORITSU 4116A - Measurement of the Loop Impedance

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(3)VoltageMeasurement
Whenthe instrument isfirst connectedto thesystem, itwill displaythe
phase-neutralvoltagewhichisupdatedevery1s.Thismodeiscancelled
wheneverthe test button ispressed. If this voltageis not normal or as
expected,DONOTPROCEED.
5.2MeasurementoftheLoopImpedance
(1)Settheinstrumenttothe200Ω or2000Ω range.
Ifthe instrument is set to the 20Ω rangeslight sparking may occur
whentesting withthe distributionboard lead althoughthe unithas
beendesignedtominimizethis.
(2)Connecttheleadtotheinstrument.
(3)Plugthemouldedmainsplugtothesocketbeingtested.
(4)Checkthe LED's arelit as indicatedin section 5.1. Ifnot DO NOT
PROCEED-checkwiring.
(5)Notethemainsvoltageifrequired.
(6)Pressthe"PresstoTest"button.Thevalueofloopimpedancewillbe
displayedwiththeappropriateunits.Ableepwillsoundoncompletion
ofthetest.
Forbestresultsalwaystestonthelowestpossiblerange.
Forexample, a loop impedance measured on the 200Ω rangemay
giveanindicationof0.3Ω whereasonthe20Ω rangeitmayread0.28
Ω.Intheeventofthereadingbeinginexcessoftherange(e.g.more
than20Ω onthe20Ω range)theappropriateover-rangesymbol"OL"
willappearonthedisplay.
Noharmwillbedonetotheinstrumentbyselectingtoolowarange.
WARNING
● IftheabovesequenceisNOTdisplayedortheREDLEDisonfor
anyreason , DO NOT PROCEED AS THEREIS INCORRECT
WIRING.Thecauseofthefaultmustbeinvestigatedandrectified.
WARNING
● Thisinstrumentisintendedonlyforuseinsinglephaseoperation
at230V+10% -15%AC phasetoearth orfor useinOLD-TT
systemphasetoneutral.