NI PXIe-4112 Local and Remote Sense

NI DC Power Supplies and SMUs Help (NI-DCPower)

Edition Date: January 2018

Part Number: 370736U-01

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NI PXIe-4112 Output Connector Plug and Sense Jumpers

The NI PXIe-4112 ships with sense jumpers installed on the output connector plug for a local sense hardware configuration. The following figure shows the output connector assembly that contains the output connector plug and installed sense jumpers.

1 Backshell screw
2 Backshell
3 Strain relief screw
4 Strain relief
5 Thumbscrew
6 Sense jumpers
7 Output connector plug

The following figure shows the pinout of the output connector plug for the NI PXIe-4112 and indicates the terminals that the sense jumpers connect.

Item Description
A Mating Connector, Terminal 0 Sense +
B Mating Connector, Terminal 1 Output +
C Mating Connector, Terminal 2 Output -
D Mating Connector, Terminal 3 Sense -
E Mating Connector, Terminal 4 GND
F Mating Connector, Terminal 5 GND
G Mating Connector, Terminal 6 Sense +
H Mating Connector, Terminal 7 Output +
I Mating Connector, Terminal 8 Output -
J Mating Connector, Terminal 9 Sense -
K Sense Jumpers Connect sense terminals to their respective output terminals on the output connector plug to manually wire the hardware for local sense measurements.

The following figure shows the pinout of the auxiliary power source output connector plug for the NI PXIe-4112.

Item Description
1 Mating Connector, Terminal 0 Auxiliary Power Input +
2 Mating Connector, Terminal 0 Auxiliary Power Input +
3 Mating Connector, Terminal 1 Auxiliary Power Input -
4 Mating Connector, Terminal 1 Auxiliary Power Input -

Local Sense Hardware Configuration

Note Note  While you can manually wire the hardware for local sense, the NI-DCPower API supports only remote sense for this device. Thus, NI-DCPower cannot detect whether a local or remote sense hardware configuration is in use. Ensure you select the appropriate hardware configuration for your application.

To manually wire the hardware for local sense measurements, ensure the sense terminals on the output connector plug are connected to their respective output terminals and connect the output terminals to your DUT.

  1. Power off and unplug the PXI/PXI Express chassis and controller.
  2. Disconnect and open the output connector assembly using the following steps:
    1. Loosen the thumbscrews at the top and bottom of the output connector assembly.
    2. Disconnect the output connector assembly from the NI PXIe-4112.
    3. Remove the screws from the output connector assembly.
    4. Open the backshell of the output connector assembly to expose the output connector plug.
  3. If you have previously configured the device for remote sense, use the provided sense jumpers to connect the Sense + and Sense - terminals to the respective Output + and Output - terminals on the output connector plug.
  4. Connect the Output + and Output - terminals to the DUT.
  5. Close the output connector assembly and reconnect it to the NI PXIe-4112 using the following steps:
    1. Secure the wires with the strain relief and secure the strain relief with screws.
    2. Close the backshell of the output connector assembly and secure it with screws.
    3. Connect the output connector assembly to the NI PXIe-4112.
    4. Tighten the thumbscrews at the top and bottom of the output connector assembly.
  6. Plug in and power on the chassis.
  7. (External Controller Only) If you are using an external controller instead of an embedded controller, power on the controller.

Remote Sense Hardware Configuration

To configure the hardware for remote sense measurements, remove all sense jumpers from the output connector plug and connect all output and sense terminals to your DUT.

  1. Power off and unplug the PXI/PXI Express chassis and controller.
  2. Disconnect and open the output connector assembly using the following steps:
    1. Loosen the thumbscrews at the top and bottom of the output connector assembly.
    2. Disconnect the output connector assembly from the NI PXIe-4112.
    3. Remove the screws from the output connector assembly.
    4. Open the backshell of the output connector assembly to expose the output connector plug.
  3. Remove all sense jumpers from the output connector plug.
  4. Connect Output +, Output -, Sense +, and Sense - terminals on the output connector plug to the DUT.
  5. Close the output connector assembly and reconnect it to the NI PXIe-4112 using the following steps:
    1. Secure the wires with the strain relief and secure the strain relief with screws.
    2. Close the backshell of the output connector assembly and secure it with screws.
    3. Connect the output connector assembly to the NI PXIe-4112.
    4. Tighten the thumbscrews at the top and bottom of the output connector assembly.
  6. Plug in and power on the chassis.
  7. (External Controller Only) If you are using an external controller instead of an embedded controller, power on the controller.

Open Sense Leads

The output control loop of the NI PXIe-4112 always includes the sense leads. As a result, the sense leads must always be connected to maintain proper output regulation, so you must ensure that the sense leads do not accidentally become disconnected while the output is enabled. Internal protection resistors on the NI PXIe-4112 minimize the impact of open sense leads by providing a fallback sense path from the output terminals. When the sense terminals are disconnected and this fallback path is active, the output terminal voltage is approximately 2% higher than the programmed value, and the accuracy of the measured voltage is degraded by the same amount.

Related Topics

Remote Sense

Local Sense

NI PXIe-4112 Front Panel

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