4-10
Cabling and Wiring
Figure 4-8. Single-Ended Input
Connecting an Analog Input Signal to a Differential Input
For differential input configurations, you must provide a bias current
return path. If at least one channel is unused or configured for
single-ended input, use the negative side of that channel as the low-level
analog common; otherwise, use the digital common.
Figure 4-9 illustrates how to connect an analog input signal to differential
analog input channel 0 on a DAS-801 board for output resistances both
less than and greater than 100
Ω
. Since analog input channel 7 is not used,
the bias current return path is connected to the negative side of channel 7.
+
−
Voltage
Source
+
−
Pin 37
Chan 0
Pin 12
LL COM
DAS-800 Board
