this has got to be an easy one to answer, but I simply can't get it to work.
I've got a D/A card set up to output 4-20mA (I think) and I'm trying to work out how to wire it up with a resistor (again I think) so that I can confirm that its doing what I expect it to.
Now, the card has the following terminals on it.
Vout, Isink, AGND, 12V out
I though it would be a simple matter to connect a 100 ohm resister across Isink and AGND and then measure the voltage across the resister with a multi meter and see what's happening.
As you've probably already worked out nothing did.
I then tried 12V to Isink with the resistor, and I got a constant voltage drop.
I really am stuck now. There must be a way of testing this setup, but I can't figure it out.
Can anyone help please.