Advantech PCI-1742U handleiding
Handleiding
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25 Chapter 3
If a floating signal source is connected to the differential input channel,
the signal source might exceed the common-mode signal range of the
PGIA, and the PGIA will be saturated with erroneous voltage-readings.
You must therefore reference the signal source against the AIGND.
Figure 3.4 shows a differential channel connection between a floating
signal source and an input channel on PCI-1742U. In this figure, each
side of the floating signal source is connected through a resistor to the
AIGND. This connection can reject the common-mode voltage between
the signal source and the PCI-1742U ground.
Figure 3.4: Differential Connection - Floating Signal
This connection has the disadvantage of loading the source down with the
series combination (sum) of the two resistors. For ra and rb
, for example,
if the input impedance rs
is 1 kW, and each of the two resistors are 100
kW, then the resistors load down the signal source with 200 kW (100 kW
+ 100 kW), resulting in a –0.5% gain error. The following gives a simpli-
fied representation of the circuit and calculating process.
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Productinformatie
| Merk | Advantech |
| Model | PCI-1742U |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 5110 MB |
