Chapter 4
Analog Input
4-24
ni.com
Table 4-2.
USB-6210/6211/6212 Analog Input Configuration
AI Ground-Reference
Setting
*
Floating Signal Sources
(Not Connected to
Building Ground)
Ground-Referenced
Signal Sources
†
Examples:
• Ungro
u
nded thermoco
u
ples
• Signal conditioning with
isolated o
u
tp
u
ts
• Battery devices
Example:
• Pl
u
g-in instr
u
ments with
non-isolated o
u
tp
u
ts
Differential (DIFF)
Non-Referenced
Single-Ended (NRSE)
Referenced Single-Ended
(RSE)
*
Refer to the
Analog Input Ground-Reference Settings
section for descriptions of the RSE, NRSE, and DIFF modes and
software considerations.
†
Refer to the
Connecting Ground-Referenced Signal Sources
section for more information.
Note
:
(USB-621
x
BNC Devices)
Refer to the appropriate
Analog Input
section for yo
u
r USB-621
x
BNC device in
Appendix A,
, for more information abo
u
t
u
sing gro
u
nded and floating signal so
u
rces with yo
u
r
device.
+
–
+
–
AI+
AI–
AI GND
S
ign
a
l
S
o
u
rce
DAQ Device
+
–
+
–
AI+
AI–
AI GND
S
ign
a
l
S
o
u
rce
DAQ Device
Vcm
+
–
+
–
AI
AI
S
EN
S
E
AI GND
S
ign
a
l
S
o
u
rce
DAQ Device
+
–
+
–
AI
AI
S
EN
S
E
AI GND
S
ign
a
l
S
o
u
rce
DAQ Device
Vcm
+
–
+
–
AI
AI GND
S
ign
a
l
S
o
u
rce
DAQ Device
Gro
u
nd-loop potenti
a
l (V
A
– V
B
)
a
re
a
dded
to me
asu
red
s
ign
a
l.
NOT RECOMMENDED for the
U
S
B-6210/6211/6212
+
–
+
–
AI
AI GND
V
B
V
A
DAQ Device
S
ign
a
l
S
o
u
rce
