Kyoritsu 4140 User Manual download pdf (Page 20)

or symbol is indicated on the LCD, DO NOT PROCEEDAS

THEREISINCORRECTWIRING.Thecauseofthefaultmustbe

investigated and rectified.

3. Voltage Measurement

When the instrument is first connected to the system, it will

display the line-earth Voltage (L-PEATT ON /ATT OFF) or line-

neutralvoltage(L-N/L-L)whichisupdatedevery1s.Ifthisvoltage

isnotnormalorasexpected,DONOTPROCEED.

7.3.2 Measurement of LOOP and PSC/PFC

a. Measurement at Mains Socket Outlet

Connectthemainstestleadtotheinstrument.Insertthemoulded

plugofmainstestleadintothesockettobetested.(seeFig.7-8)

Carry out the initial checks

Pressthetestswitch.Abeepwillsoundasthetestisconducted

andthevalueofLoopimpedancewillbedisplayed.

b. Measurement at the distribution board

ConnectthedistributionboardleadModel7246totheinstrument.

b-1.Measurement of Line – Earth Loop Impedance and PFC

ConnectthegreenPEleadoftheModel7246totheearth,the

blue N lead to the neutral of the distribution board and the red

Lleadtoone‘line’ofthedistributionboard.(SeeFig.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

distributionboard.(SeeFig.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

distributionboard.(SeeFig.7-11)

Carry out the initial checks

Pressthetestswitch.Abeepwillsoundasthetestisconducted

and the value of loop impedance will be displayed. When

disconnecting from the distribution board, it is good practice to

disconnect the line first.

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Kyoritsu 4140 User Manual Page 20