TB-414X User Guide

This document explains how to install and use the TB-414X Screw Terminal Connector Kit for PXIe-414x (NI Part Number 787611-01).

The TB-414X connector block is used to convert the 25-position D-SUB connector of the PXIe-414x SMU to screw terminal connections while maintaining low leakage performance.

Read this document before you install, configure, operate, or maintain this product. Users are required to familiarize themselves with installation and wiring instructions in addition to requirements of all applicable codes, laws, and standards. Visit ni.com/manuals for more information about your product, including specifications, pinouts, and instructions for connecting, installing, and configuring your system.

Notice This device is intended for use only with the PXIe-4140, PXIe-4141, PXIe-4142, PXIe-4143, PXIe-4144, PXIe-4145, and PXIe-4147 SMUs, which are referred to collectively as PXIe-414x SMUs. For more information about the PXIe-414x SMUs, refer to ni.com/manuals.

Kit Contents and Other Equipment

Your kit includes an assembled TB-414X. In addition, you will need the following items not included in your TB-414X kit to install and use the TB-414X.

  • PXIe-414x
  • 24 to 18 AWG signal wires
  • Number 1 Phillips-head screwdriver
  • 2.5 mm (3/32) flathead screwdriver
  • Wire insulation strippers
  • Wire cutters

Visit ni.com for more information about the PXIe-414x, including getting started information and module specifications.

Installing the TB-414X

Complete the following steps to install the TB-414X with a PXIe-414x and prepare signal connections.

Before you begin, install the PXIe-414x in a chassis and ensure that all signals are disconnected from the PXIe-414x if you have not already done so. Refer to the getting started guide for your module at http://www.ni.com/manuals for installation instructions.
Note Maintaining low leakage performance of the SMU and TB-414X requires careful selection and termination of the external wiring to ensure guarding of the HI and HI Sense signals and to minimize negative effects from wiring insulation materials and contaminants. The SHDB25F-DB25F-LL cable accessory has been designed with these considerations in mind and utilizes the TB-414X, allowing for one end to be easily reterminated into an alternate connector, if needed.
Note NI recommends wearing clean gloves during assembly to avoid contamination from residues or other debris.
  1. Prepare the wires by stripping the insulation 5 mm to 6 mm (0.197 in. to 0.236 in.) from one end of all wires.
    Use signal wires with a wire gauge of 24 to 18 AWG.
  2. Disassemble the TB-414X.
    1. Unscrew the four screws on the top of the TB-414X to remove the top cover.
    2. Unscrew the two screws securing the strain relief to remove the strain relief.
    Figure 1. Disassembled TB-414X

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  3. Connect the signal wires and ground/shield wire by inserting the stripped end of the wires into the appropriate terminals and tighten the screws of the screw terminals to a torque of 0.5 Nm (4 lb · in.).

    Refer to the following pinout, signal information, and PXIe-414x pin map to make the appropriate connections for your application.

    Figure 1. TB-414X Pinout

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    Table 1. TB-414X Signals and DB25 Pin Map
    Screw Terminal DB25 Connector Pin
    LO Connector
    CH 0 LO 16
    CH 0 LO S 3
    CH 1 LO 19
    CH 1 LO S 6
    CH 2 LO 22
    CH 2 LO S 9
    CH 3 LO 25
    CH 3 LO S 12
    CH S GND Shield
    CH 0 Connector
    CH 0 GUARD 1
    CH 0 HI 14
    CH 0 HI S 2
    CH 1 Connector
    CH 1 GUARD 4
    CH 1 HI 17
    CH 1 HI S 5
    CH 2 Connector
    CH 2 GUARD 7
    CH 2 HI 20
    CH 2 HI S 8
    CH 3 Connector
    CH 3 GUARD 10
    CH 3 HI 23
    CH 3 HI S 11
  4. Reassemble the TB-414X.
    1. Bundle the wires together under the strain relief and install the strain relief by tightening the two screws removed in previous steps to a torque of 0.3 Nm (2.7 lb · in.).
      • If you are connecting several wires, assemble the strain relief upward.
      • If you are connecting only a few wires, assemble the strain relief downward for greater retention.
        Figure 1. TB-414X Strain Relief

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        1. Strain Relief Up
        2. Strain Relief Down
    2. Install the top cover of the TB-414X by tightening the four screws removed in previous steps to a torque of 0.3 Nm (2.7 lb · in.).
  5. Connect the TB-414X to the PXIe-414x.
    1. Align the female D-SUB connector on the back of the TB-414X and the male D-SUB connector on the front of the PXIe-414x and attach.
    2. Tighten the thumbscrews on the front of the TB-414X until the terminal block is secured to the PXIe-414x.
Figure 1. Installed TB-414X

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To uninstall the TB-414X, loosen the thumbscrews on the front of the TB-414X and detach the terminal block from the front of the PXIe-414x.