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Chapter 4
Analog Input
Using Non-Referenced Single-Ended (NRSE) Connections for
Ground-Referenced Signal Sources
Figure 4-11 shows how to connect ground-reference signal sources in NRSE mode.
Figure 4-11.
Single-Ended Connections for
Ground-Referenced Signal Sources (NRSE Configuration)
Note
(NI USB-6341/6343/6346/6361/6363 BNC Devices)
To measure a
ground-referenced signal source on X Series USB BNC devices, move the switch
under the BNC connector to the GS position.
AI <0..31> and AI SENSE must both remain within ±11 V of AI GND.
To measure a single-ended, ground-referenced signal source, you must use the NRSE
ground-reference setting. Use Table 4-4 to determine how to correctly connect your AI signal.
AI SENSE is internally connected to the negative input of the NI-PGIA. Therefore, the ground
point of the signal connects to the negative input of the NI-PGIA.
Table 4-4.
AI Signal Connections
Signal
Ground-Reference
AI <0..15>
AI SENSE
AI <16..79>
AI SENSE 2
AI <80..143>
AI SENSE 3
AI <144..207>
AI SENSE 4
MIO X
S
erie
s
Device Config
u
red in NR
S
E Mode
Inp
u
t M
u
ltiplexer
s
I/O Connector
AI GND
AI
S
EN
S
E
AI <0..x>
–
+
–
+
V
cm
V
s
Gro
u
nd-
Referenced
S
ign
a
l
S
o
u
rce
Common-
Mode
Noi
s
e
a
nd Gro
u
nd
Potenti
a
l
PGIA
–
+
–
+
V
m
Me
asu
red
Volt
a
ge
In
s
tr
u
ment
a
tion
Amplifier
Summary of Contents for 6368
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