KYORITSU 4140 - Manual (Page 20)

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or symbol is indicated on the LCD, DO NOT PROCEEDAS
THEREISINCORRECTWIRING.Thecauseofthefaultmustbe
investigated and rectified.
3. Voltage Measurement
When the instrument is first connected to the system, it will
display the line-earth Voltage (L-PEATT ON /ATT OFF) or line-
neutralvoltage(L-N/L-L)whichisupdatedevery1s.Ifthisvoltage
isnotnormalorasexpected,DONOTPROCEED.
7.3.2 Measurement of LOOP and PSC/PFC
a. Measurement at Mains Socket Outlet
Connectthemainstestleadtotheinstrument.Insertthemoulded
plugofmainstestleadintothesockettobetested.(seeFig.7-8)
Carry out the initial checks
Pressthetestswitch.Abeepwillsoundasthetestisconducted
andthevalueofLoopimpedancewillbedisplayed.
b. Measurement at the distribution board
ConnectthedistributionboardleadModel7246totheinstrument.
b-1.Measurement of Line – Earth Loop Impedance and PFC
ConnectthegreenPEleadoftheModel7246totheearth,the
blue N lead to the neutral of the distribution board and the red
Lleadtoone‘line’ofthedistributionboard.(SeeFig.7-9)
b-2.Measurement of Line – Neutral Loop Impedance and PSC
Connect the blue N lead of the Model 7246 to the neutral
of the distribution board, the red L lead to one line of the
distributionboard.(SeeFig.7-10)
b-3.Measurement of Line – Line Loop Impedance and PSC
Connect the blue N lead of the Model 7246 to the line of
the distribution board, the red L lead to another line of the
distributionboard.(SeeFig.7-11)
Carry out the initial checks
Pressthetestswitch.Abeepwillsoundasthetestisconducted
and the value of loop impedance will be displayed. When
disconnecting from the distribution board, it is good practice to
disconnect the line first.