I have a programmable power supply (Sorensen DCR300-16T) that requires a floating programming voltage. From the manual:
(3.9.1) In selecting a signal source, the following should be considered:
The source must be capable of sinking approximately 1 mA (the Programming Current).
A floating (ungrounded) source must be used. All signal programming voltages will, however, have a common return.
I would like to use an analog voltage (ground-referenced) output of a NI PCI DAQ card for this purpose. (e.g. PCI-6713)
In tests, the power supply programming inputs float as much as +/-75 V with respect to the building ground. I suspect that the solution here is to insert something between the DAQ and the power supply input that converts a ground-referenced signal to a floating signal.
What is the conventional advice for how to do this?