Installing the TB-414X on the PXIe-4145

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

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 with your module.
  • 24 AWG to 18 AWG signal wires
  • Number 1 Phillips-head screwdriver
  • 2.5 mm (3/32) flathead screwdriver
  • Wire insulation strippers
  • Wire cutters
Note Maintaining low leakage performance of the PXIe-4145 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 AWG 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 8. 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 N · m (4 lb · in.).

    Refer to the following pinout, signal information, and PXIe-4145 pin map to make the appropriate connections for your application.

    Figure 9. TB-414X Pinout

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    Table 8. TB-414X Signals and DB25 Pin Map
    Connector Screw Terminal DB25 Connector Pin
    LO LO, CH 0 16
    Sense LO, CH 0 3
    LO, CH 1 19
    Sense LO, CH 1 6
    LO, CH 2 22
    Sense LO, CH 2 9
    LO, CH 3 25
    Sense LO, CH 3 12
    Shield GND, CH <0..3> Shield
    CH 0 Guard, CH 0 1, 15
    HI, CH 0 14
    Sense HI, CH 0 2
    CH 1 Guard, CH 1 4, 18
    HI, CH 1 17
    Sense HI, CH 1 5
    CH 2 Guard, CH 2 7, 21
    HI, CH 2 20
    Sense HI, CH 2 8
    CH 3 Guard, CH 3 10, 24
    HI, CH 3 23
    Sense HI, CH 3 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 N · m (2.7 lb · in.).
      Table 8. TB-414X Strain Relief
      Strain Relief Position When to Use Diagram
      Strain Relief Up Use if you are connecting several wires
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      Strain Relief Down Use if you are connecting only a few wires
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    2. Install the top cover of the TB-414X by tightening the four screws removed in previous steps to a torque of 0.3 N · m (2.7 lb · in.).
  5. Connect the TB-414X to the module.
    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 module and attach.
    2. Tighten the thumbscrews on the front of the TB-414X until the terminal block is secured to the module.
    Figure 10. Installed TB-414X

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  6. Power on the chassis.
    Note Low energy transients can appear at the output terminals of your PXIe-4145 during certain situations, such as power-up, power-down, device driver loading, and self-calibration. Additionally in these situations, the output is pulled to ground through a 10 kΩ resistor.

    The energy of the transients is typically less than 1 µJ, which is not enough to cause damage to most loads. However, some extremely sensitive devices could be affected. Additionally, the presence of the 10 kΩ pulldown to ground could pose a problem for some loads. If you suspect your load could be affected, NI recommends that you disconnect all power supplies and SMU connections while performing any of the above operations. To avoid transients caused by a power failure, consider employing an uninterruptible power supply system.

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 module.