For the instrumentation amplifiers to achieve the best noise rejection
it is essential that any noise induced in the wiring be common mode. This
is best achieved by the use of shielded twisted pair wiring between the sensor
or signal source and the instrumentation front-end. It is important to note
that not all "shielded pair'' cable are in fact twisted.
Cables where the wire pairs simply run parallel to each other are
significantly more susceptible to induced normal mode noise caused
by fluctuating fields as well as cross coupling between adjacent pairs.
The use of shielded twisted pair cable is strongly
encouraged.
The telephone industry is a testament to the noise immunity that
can be achieved through the use of twisted pair cable and differential signaling.
They run twisted pair cable for miles
along power lines and open country with thunder storms
and achieve amazingly low crosstalk and noise pickup ... remember
the human ear is a marvelous device with a logarithmic response so
even the smallest amount of noise or crosstalk can be objectionable.