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Why 4-20mA SIGNAL IS PREFERRED OVEA A 0-10v signal?
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Answer Posted / priyabrata samanta
The reason is - if we use 0 to 10 volt range then even if
an error occur in the transmission line we will not be able
to identify it. As there will not be any way to compare this
state with zero signal.
Whereas in 4to 20 ma current range we will be able to
compare the fault in the transmission line with zero
signal(4 ma).
Another reason is that using voltage as a transmission
signal is unfaithful and erroneous. As there will be voltage
drop in the transmission line , and therefore true signal
will not be received at the receiving side. But if we use
current as the transmission signal then noise can effect the
transmission, but "current drop" will never happen.
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