Create Differential Cables

December 20, 2018

It may be necessary to create differential cables when performing an automated VR9500 calibration verification. The directions are as follows:


  • (1) Pomona 4969 BNC
  • (2) Pomona 4970 BNC
  • (1) small-diameter heat shrink
2 BNC, Male Plug To Wire Lead, 1 BNC, Female Socket (Jack) To Wire Lead, and heat shrink tubing

Figure 2.9. Required parts.

Assembly Instructions

  1. Remove the black leads from both Pomona 4970 parts.
  2. Cut the heat shrink in half.

Figure 2.10. Remove black leads and cut heat shrink.

  1. Strip the ends of all the wires.
  2. Place the heat shrink on both leads of the Pomona 4969.
Heat shrink on both leads of the Pomona 4969

Figure 2.11. Prepare parts.

  1. Solder one Pomona 4970 (red lead) to each lead of the Pomona 4969.
Soldered leads

Figure 2.12. Solder leads.

  1. Move the heat shrinks over the soldered connections.
  2. Use a heat gun to melt the heat shrinks into place.
Heat shrinks applied to differential cables

Figure 2.13. Apply heat shrinks.

  1. Label the red-red lead as DRIVE.
  2. Label the black-red lead as COLA.


View Video Instructions