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what is zero trim and span trim?. at which problem we need
to use this?

Question Posted / manohar chotrani

Answer Posted / manohar chotrani

You are talking about electronic transmitter calibration
with the help of HART communicator. When the transmitter
sensor zero is out we correct it by trimming zero of the
transmitter while applying 0 pressure to the transmitter.
span trim is the sending simulated current signal in the
loop without disturbing analog signal and checking the same
at different points in the loop.Both the operations are
carried out with FSK

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