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Installing the Safety Interlock Connector on the PXIe-4135

Last Modified: November 23, 2020

Each PXIe-4135 source measure unit (SMU) in the VCSEL I-V Test Subsystem requires a safety interlock circuit to ensure that the PXIe-4135 outputs are in a safe state, regardless of the programmed state of the SMU.

Before you begin, verify that the safety interlock connector is wired to a test fixture that ensures operator safety.


  • Insulation strip tool

Complete the following steps to prepare a cable for the safety interlock connector and install the safety interlock connector onto the front panel of a PXIe-4135 SMU.

  1. Measure and mark your strip length on the safety interlock cable.

    The required wire strip length for the safety interlock cable is 7.5 mm (0.295 in.) minimum and 10 mm (0.394 in.) absolute maximum. The acceptable AWG range for the safety interlock cable is 16-24.

  2. Use an insulation strip tool to expose cable of the appropriate length.
  3. The safety interlock connector accepts both solid and multi-strand conductor cabling. If you are using a multi-stranded cable, twist the strands together before insertion. For additional cabling reliability, strip and tin multi-stranded conductors before insertion.
  4. Insert the cable.
  5. Inspect for loose strands and tighten any retention screws on the safety interlock connector assembly to hold it in place.
  6. Connect the safety interlock connector to the device.
After you connect the PXI chassis to facility power, perform the safety interlock test to ensure the interlock is installed correctly.

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