Advantech PCI-1710HG Especificaciones Pagina 36

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Chapter 3
– 28 –PCI-1710 series Users Manual
Advantech Co., Ltd.
www.advantech.com
Figure 3-4: Differential input channel connection - floating signal
source
However, this connection has the disadvantage of loading the source
down with the series combination (sum) of the two resistors. For r
a
and
r
b
, for example, if the input impedance r
s
is 1 kW, and each of the two
resistors is 100 kW, then the resistors load down the signal source with
200 k(100 k+ 100 k), resulting in a -0.5% gain error. The following
gives a simplified representation of the circuit and calculating process.
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