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In reference to power supplies and SMUs, transient response describes how a supply responds to a sudden change in load. Changes in load current, such as a current pulse, can cause large voltage transients. The transient response specifies how long it takes before the transients recover. The following figure shows how the transient behavior is typically specified. The transient response time specifies how quickly the supply can recover to within a certain voltage (ΔV) when a specific change in load (ΔI) occurs. Some power supplies also specify a maximum transient voltage dip under the same load conditions.
There is a trade-off between transient response and the stability of the supply under a wide variety of loads. To achieve the fastest transient response, a device should have a high gain-bandwidth (GBW) product, but the higher GBW is, the more likely it is that the device will become unstable with certain loads. Thus most devices compromise performance to achieve stability under most conditions. Other devices allow a degree of customization to enable optimization of performance under different circumstances.
The following devices do not support this feature: NI PXI-4110/4130/4132, NI PXIe-4112/4113.