|NI-DCPower (English | Japanese)|
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.||
|Normal||Balances stability and the speed of the device. It is the default transient response setting and is appropriate for most situations.||
|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.||
|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.||
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.
The following devices support this feature: PXIe-4135, NI PXIe-4137/4139/4141/4143/4145, PXIe-4162/4163
|Gain Bandwidth (GBW)||Sets the GBW of the device.
You can set the following GBW in voltage mode for supported devices:
You can set the following GBW in current mode for supported devices:
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:
|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.