Fluke Biomedical 942A-200L-M4 - Manual (Page 77)

Appendix
Cable Termination Instructions
D
D-1
Appendix D
Cable Termination Instructions
D.1 Cable Termination Instructions
The procedures and instructions provided in Appendix D are provided for reference in terminating the field
cables to the Digital Ratemeter (UDR). Mating connectors are provided in the P/N 942A-100-4 Mating
Connector Kit, provided with the UDR. The instructions provided below are based on the use of P/N 50-
100 Multiconductor cable. For other customer-supplied cables, the same basic procedures, modified for
the specific cable used, may be utilized.
Detector Field Cable Preparation ( P2 )
Prior to terminating the cable, the interior layout of the control room panel or cabinet must be evaluated to
determine field cable routing, support, service loop space, and, where EMI/RFI protection is required,
drain wire grounding. Note that to withdraw the UDR from the chassis for access to the monitor set point
entry controls, the UDR field cables must include a service loop of a minimum of 6 inches in length. To
permit complete removal of the UDR from the front of the panel or cabinet, a 21-inch, minimum, service
loop is needed. In order to determine the actual length of stripped cable that will be needed, or that can
be accommodated in the specific panel or cabinet, it is suggested that the cable be temporarily installed
in the cabinet, following the actual routing that will be used.
Prior to stripping the outer cable jacket, a 4-inch length of 0.75 I.D. shrinkable tubing (provided by the
user) should be slid over the 0.675 in cable jacket. The shrink tubing will be used to seal and protect the
end of the cable after the termination process is completed. To prepare the cable for termination, a
minimum of 7 inches of the cable outer jacket must be stripped off the cable. This will allow for the
stripping of approximately one inch from the various conductors, and provide 6 inches of actual service
loop cable. In addition, for EMI/RFI protection, the drain wire must be terminated to an earth ground
within the control room panel or cabinet. The length of the drain wire will be based on the distance
between the UDR rear panel and the ground location. The length of cable jacket to be stripped will then
be based on the distance to the drain wire grounding point.
Once the cable outer jacket is stripped to the proper length, the aluminum tape shield and mylar binder
may be removed, taking care not to damage the No. 20 AWG drain wire. The drain wire may then be
separated from the remaining conductors, for routing and termination at the grounding point.
Next, the HV and Signal coaxial cables may be separated from the bundle, followed by the single
conductors wires that are required for the specific application, and the polyester filler cord. Refer to the
project specific detector loop drawing, or the generic detector loop drawing, 942A-200-106, provided in
Appendix B for actual conductors to be used.
The polyester filler cord may now be removed. Cut the cord as close to the outer jacket as possible.
The cable should now be routed to the rear panel of the UDR, following the actual path that will be used.
Ensuring a minimum of 7 inches of conductors is provided for the UDR service loop, the excess conductor
length may now be removed. Any unused conductors may be cut away, or coiled for future use. To
protect the single conductors from abrasion, and provide a finished look to the cable, a 5-inch length of
heat shrinkable tubing, or sleeving, may be placed over the single conductors. For controlled
environment applications, it is not required to apply heat to this shrink tubing. Termination instructions for
each connector are provided below.