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4-10
Cabling and Wiring
The DAS-8/PGA(G2) and DAS-8/AO boards contain digital commons,
but no dedicated low-level analog commons. If you are using all eight
analog input channels and all eight channels are configured for
differential input, you must connect a bias return path to a digital
common instead of a low-level analog common. If at least one channel is
unused or configured for single-ended input, you can use the negative side
of the channel as a low-level analog common.
When wiring analog input signals, it is recommended that you terminate
all unused input channels to low-level ground; this prevents the internal
amplifier circuitry from saturating if you select an unconnected input and
ensures the accuracy of your data.
Connecting an Analog Input Signal to a Single-Ended Input
Figure 4-9 illustrates how to connect an analog input signal to
single-ended analog input channel 0 on a DAS-8 Series board.
Figure 4-9. Single-Ended Input
+
−
Voltage
Source
+
−
Pin 37
Chan 0
Pin 12
LL COM
DAS-8 Board
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