Interpret Withstand Voltage Specifications for PXIe-2593

Updated Aug 25, 2026

Reported In

Hardware

  • PXIe-2593
  • Switch

Issue Details

I am reviewing the specifications for the NI PXIe-2593 and noticed that the module can withstand up to 800 V impulse voltage. However, the specifications also state a maximum switching voltage of 150 V, CAT I (channel-to-channel and channel-to-ground).
 
I am unsure whether signals up to 800 V can be connected to the module and remain within specifications, or if the module is limited to the maximum switching voltage ratings. I need clarification on which voltage levels can be safely connected to the PXIe-2593.

Solution

The 800 V impulse withstand specification should not be interpreted as an allowable operating voltage for the NI PXIe-2593.
 
The impulse withstand rating is a by-product of the module's insulation design and creepage/clearance margins. NI verifies this rating using a controlled, standardized impulse test of short duration. This specification represents a design margin for infrequent transient events and is not intended as a continuous operating specification.
 
To remain within the published specifications:
  • Connect signals that comply with the maximum switching voltage ratings.
  • Keep signal levels below:
    • 100 Vrms
    • 150 Vpk
    • 150 VDC
  • Use the module only within Measurement Category I (CAT I) applications.
  • Avoid treating the 800 V impulse withstand rating as a voltage that can be continuously applied to the module.
  • Avoid assuming that impulse voltages up to 800 V will be fully isolated from adjacent channels or ground during normal operation.
 

Additional Information

The PXIe-2593 specifications define the module as a Measurement Category I device with a maximum switching voltage of 150 V (channel-to-channel and channel-to-ground). The published 800 V impulse withstand rating is intended to characterize insulation robustness during standardized transient testing and should not be used as a basis for determining allowable operating voltages.

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