Multifunction Electrical Tester Calibrator
Theory of Operation
9
RCD in PAT Function (RCD Board)
Use this function to adjust PAT testers that have an RCD function that measures trip time in
portable RCD breakers such as extension cords. In this function, the Product does not supply
power line voltage. The voltage comes from the DUT. The RCD board contains two FET
switches and a current transformer that senses tripping current that comes from the PAT
tester. This functionality is at the front terminals L - N - Lsense - N sense. A special cable
adapter, RCD - PAT, comes with the Product to simplify the connection between the Product
and a tested PAT. See
.
Figure 9. RCD Board
L
N
Lsense
Nsense
Front Panel
Terminals
Front Panel
Terminals
To CPU/IFC
Electronic
Switch
A
Electronic
Switch
From CPU/IFC