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National Instruments
29 NI sbRIO-960x/962x/963x OEM Instructions & Specifications
Differential Measurement Configurations
To attain more accurate measurements and less noise on
NI sbRIO-9626/9636 devices, use a differential measurement
configuration. A differential measurement configuration requires
two inputs for each measurement, reducing the number of available
channels from 16 to eight. Table 6 shows the signal pairs that are valid for
differential connection configurations.
The following figure shows how to make a differential connection for a
floating signal and for a ground-referenced signal.
Figure 23.
Differential Connections with Floating and Grounded Signal Sources
Table 6.
Differential Analog Input Signals on the NI sbRIO-9626/9636
Channel
Signal -
0
AI0
AI8
1
AI1
AI9
2
AI2
AI10
3
AI3
AI11
4
AI4
AI12
5
AI5
AI13
6
AI6
AI14
7
AI7
AI15
+
-
R
D
R
D
+
-
R
D
= 100 k
Ω -
1M
Ω
AI+
AI-
AI GND
Flo
a
ting
S
ign
a
l
S
o
u
rce
+
-
+
-
AI+
AI-
AI GND
Gro
u
nded
S
ign
a
l
S
o
u
rce