Does the PXI 2567 Has Polarity?

Updated Mar 18, 2021

Reported In


  • PXI-2567

Issue Details

- Can invert the polarity shown in the Example Configuration of the Help topic?
Example Configuration presented on the NI Switch Help


The channels of this card will have polarity and that polarity cannot be inverted due to the diode that is the body diode of the FET, which is shown in the channel schematic:

Diode in schematic.PNG
In normal operation (like in the example configuration) the diode is connected in the following way: Positive to channel and negative to COM, which will cause that in an open connection the diode is reversed biased and it will not conduct, but if that polarity is inverted, when it is required an open connection the diode will be forward biased and will conduct.
Also, the FET opens and closes based on the gate-source voltage, so if the polarity is inverted it will require a higher voltage value to close the FET.