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Selecting a cable type will also set the VOP of that
particular cable into the VOP display settings.
SECTION 4: APPLICATION NOTES
4.1 TDR - Tap Plate Connector
It can be tiresome breaking down installed taps and
installing an adapter in order to test the cable with a
TDR. A solution is to modify a tap plate of the same
type in your system to connect the TDR to each leg
of the cable. The modified tap plate can be installed
instead of the original tap plate to gain quick and easy
access to the cable.
First, using a two port tap, remove the circuit board.
De-solder and remove all the components, from the
circuit board. Next, make two wire jumpers which con-
nect the input and output ports to housing connectors
at the respective tap ports on the plate. Connect the
input connector to one tap port and the output con-
nector to the other tap port. This makes the two tap
ports independent from each other and used to test in
either direction from the tap.
To find a location for the wire jumper, look for a coil
connection from the IN to the OUT port which passes
any power signal on the cable through the tap. Solder
one end of a wire jumper to one side of the removed
coil location. To connect the jumper to the tap port,
look for a hole in the circuit board which is connected
to the tap port center conductor. Solder the other end
of the jumper here. Do this for both tap ports.
Use an Ohmmeter to check for continuity when trying
to locate which holes in the board to use, and to check
to see if the plate is wired properly.
To use, remove an existing face plate of a tap either
overhead or underground and replace it with a modi-
fied TAP plate. Connect the lead from the TDR to the
Choke
Coil
IN Connector
Port Connections
Jumper Wires
OUT Connector