Hi everybody,
It is suggested to our company to make a design of some test equipment for
testing functionality of data acquisition systems for industrial automation
(from different suppliers).
The systems that must be tested can have, in particular:
1) 4..20mA inputs;
2) Inputs for RTD sensors, 3-wire and 4-wire.
So we must have in our test equipment 4..20mA outputs, and some circuits,
that
will simulate RTD. I hope, that we can solve both of these problems.
But we are not sure that in the case when our outputs are not galvanically
isolated from each other, we do not run into problems with some systems.
From the other side, galvanically isolated outputs will be more expensive
and will have less precision. It is much better to have isolated groups of
channels.
Can somebody help to solve this dilemma?
May be, it is impossible or very rear case, when the equipment for
industrial
automation will not work with single ended 4-20mA outputs or RTD's that
are connected with each other? I suspect, that it is true, but am not sure.
I urgently need the answer.
Please help.
With best regards,
Sergey Langvagen.
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Author: Sergey Langvagen
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