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Anyone have a 4-20ma loop calibrator circuit?

That is a 4-20ma source and sink.

I was thinking of using a AVR to do the control side but have not got my
head around how to source / sink 4-20 ma in circuits that have different
voltages i.e. 5v to 50v.

Is there a reference to a standard for 4-20ma testing?

_______________________________________

Feel the power of the dark side!  
Atmel AVR

Roy Hopkins
Tauranga
New Zealand
_______________________________________


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