output a floating signal from BNC-2110 and PCI6713

[HongyiHuang]

We are trying to control a current supply with analog output from BNC-2110 board and PCI6713 card. Our current supply requires a floating input, however we found the analog output only has a grounded reference, even it's already switched to 'FS'. Is there a way to generate a floating output? We appreciate any suggestions!

[santo_13]

You cannot change the AO into isolated. What current supply model?

There are isolated analog output cards like https://www.ni.com/en-us/shop/model/pxie-4322.html

[Henrik_Volkers]

Use a OP amp (or better two) to make the output float?

One amp and 4 identical resistors form a differential amplifier, the second buffer the output 'GND' or reference  to the diff amp reference.

But still migth depend on the actual voltage input of your current source. (Type?)

[AnalogKid2DigitalMan]

If you don't want to roll your own, use a COTS approach such as this example (there are many other brands):

https://www.dataforth.com/dsca49

-AK2DM

[santo_13]

When using an external isolator, do consider its bandwidth and your signal frequency.

---

[AnalogKid2DigitalMan]

Santhosh raises a valid point that I neglected to mention.

-AK2DM