Configuring Transient Response

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

Edition Date: January 2018

Part Number: 370736U-01

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Use the niDCPower Transient Response property or the NIDCPOWER_ATTR_TRANSIENT_RESPONSE attribute to set the transient response.

The following table lists the transient response settings available in NI-DCPower.

Transient Response Description Supported Devices
Slow Increases stability while decreasing the speed of the device. Select Slow if connecting a DUT causes the device to exhibit symptoms of instability, such as unstable readings or excessive noise.
  • PXIe‑4135
  • NI PXIe‑4136/4137
  • NI PXIe‑4138/4139
  • NI PXIe‑4140/4141/4142/4143/4144/4145
  • PXIe‑4162/4163
Normal Balances stability and the speed of the device. It is the default transient response setting and is appropriate for most situations.
  • PXIe‑4135
  • NI PXIe‑4136/4137
  • NI PXIe‑4138/4139
  • NI PXIe‑4140/4141/4142/4143/4144/4145
  • NI PXIe‑4154
  • PXIe‑4162/4163
Fast Increases the speed of the device for improved transient response with benign loads. Select Fast if you need faster response and if doing so does not cause the device to exhibit symptoms of instability, such as unstable readings or excessive noise.
  • PXIe‑4135
  • NI PXIe‑4136/4137
  • NI PXIe‑4138/4139
  • NI PXIe‑4140/4141/4142/4143/4144/4145
  • NI PXIe‑4154
  • PXIe‑4162/4163
Custom Allows freedom to adjust compensation for specific loads. Select Custom if you need to optimize the speed/stability tradeoff. Refer to Custom Compensation for detailed information.
  • PXIe‑4135
  • NI PXIe‑4137
  • NI PXIe‑4139
  • NI PXIe‑4141/4143/4145
  • PXIe‑4162/4163

Custom Compensation

Set the niDCPower Transient Response property to Custom or the NIDCPOWER_ATTR_TRANSIENT_RESPONSE attribute to NIDCPOWER_VAL_CUSTOM to customize compensation on the device.

The following table lists the compensation parameter settings available for supported devices. You can independently set the parameters for constant voltage mode and constant current mode. There are three compensation parameters for constant voltage mode and three compensation parameters for constant current mode, for a total of six writable and readable parameters.

Support for Custom Compensation

The following devices support this feature: PXIe-4135, NI PXIe-4137/4139/4141/4143/4145, PXIe-4162/4163

Compensation Parameter Details
Gain Bandwidth (GBW) Sets the GBW of the device.

You can set the following GBW in voltage mode for supported devices:
  • PXIe-4135—10 Hz to 20 MHz
  • NI PXIe-4137—10 Hz to 20 MHz
  • NI PXIe-4139—10 Hz to 20 MHz
  • NI PXIe-4141—100 Hz to 2 MHz
  • NI PXIe-4143—100 Hz to 1 MHz
  • NI PXIe-4145—100 Hz to 2.4 MHz
  • NI PXIe-4162/4163—10 Hz to 20 MHz

You can set the following GBW in current mode for supported devices:
  • PXIe-4135—10 Hz to 20 MHz
  • NI PXIe-4137—10 Hz to 20 MHz
  • NI PXIe-4139—10 Hz to 20 MHz
  • NI PXIe-4141—1 kHz to 2 MHz
  • NI PXIe-4143—1 kHz to 1.3 MHz
  • NI PXIe-4145—1 kHz to 400 kHz
  • NI PXIe-4162/4163—10 Hz to 20 MHz

Higher values give faster response but poorer stability.
Compensation Frequency The geometric mean of the pole frequency and the zero frequency. It is the frequency of maximum phase shift caused by the pole-zero pair.

You can set Compensation Frequency for supported devices:
  • PXIe-4135—20 Hz to 20 MHz
  • NI PXIe-4137—20 Hz to 20 MHz
  • NI PXIe-4139—20 Hz to 20 MHz
  • NI PXIe-4141—100 Hz to 300 kHz
  • NI PXIe-4143—100 Hz to 300 kHz
  • NI PXIe-4145—100 Hz to 300 kHz
  • NI PXIe-4162/4163—100 Hz to 300 kHz
Pole-Zero Ratio Sets the ratio of the pole frequency to the zero frequency. A lag compensator has a pole-zero ratio set to a value less than 1.0, and a lead compensator has a pole-zero ratio set to a value greater than 1.0. If the pole-zero ratio is set to exactly 1.0, the pole and zero cancel each other and have no effect. You can set the pole-zero ratio to any value between 0.125 and 8.0.

To begin customizing the transient response for your application, you can set Transient Response to Slow, Normal, or Fast and read the compensation parameters. This will provide you with a good starting point from which you can derive your custom settings.

Related Topics

PXIe-4135 Transient Response

NI PXIe-4136/4137 Transient Response

NI PXIe-4138/4139 Transient Response

NI PXIe-4140/4141 Transient Response

NI PXIe-4142/4143 Transient Response

NI PXIe-4144/4145 Transient Response

NI PXIe-4154 Transient Response

Transient Response

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