@LindsW wrote:
Hi Jonnas,
It sounds like a unity gain op-amp (voltage follower) is the correct approach. Take a look at this white paper article, which discusses how to hook up a DAQ device with a voltage follower (section 3) to double check you have it connected correctly:
http://www.ni.com/white-paper/4494/en/#toc3
Regards,
Thanks Linds!
AS a matter of fact, I did go the the op-amp road but it turned out that the
follower op-amp indeed follows the voltage drop...
I figured that the real problem I have is the 2mA limit on the USB-6212
So I designed the simplest emitter follower transistor current amplifier [examle in the link]
(http://www.colorado.edu/physics/phys3330/PDF/Experiment7.pdf)
and for now it works perfectly.
I'm happy
Thanks for a nice discussion!
-J