2. Wiring Check
After the connection, ensure that the symbols for Wiring check on the LCD are
in the status indicated in Fig.29 before pressing the test button.
If the status of the symbols for Wiring check differ from Fig.29 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 (MODE L-PE) or line-neutral voltage (MODE L-N/L-L) which is
updated every 1s. If this voltage is not normal or as expected, DO NOT
PROCEED.
9.3.2 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.22,25)
Press MODE Switch (F1) and select L-N or PSC to measure between Line –
Neutral, or L-PE or PFC to measure between Line-PE.
Carry out the initial checks
Press the test button. A beep will sound as the test is conducted and the
value of loop impedance will be displayed. If the display shows '>' then this
usually means the value measured exceeds the range.
b. Measurement at the distribution board
Connect the distribution board lead ACC064 to the instrument.
Measurement of Line – Earth Loop Impedance and PFC
Press the Mode Switch (F1) and select L-PE or PFC.
Connect the green PE lead of the ACC064 to the earth, the blue N lead to
the neutral of the distribution board and the brown L lead to one line of
the distribution board. (See Fig.23)
Measurement of Line – Neutral Loop Impedance and PSC
Press the Mode Switch (F1) and select L-N/L-L or PSC.
Connect the blue N lead of the ACC064 to the neutral of the distribution
board, the brown L lead to one line of the distribution board. (See Fig.24)
Carry out the initial checks
Press the test button. 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.
LOOP/PSC/PFC
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