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National Instruments Corp.
15
NI 9205 Operating Instructions and Specifications
Note
If yo
u
leave COM
u
nconnected, the signals float
o
u
tside the working inp
u
t range of the NI 9205. This may
res
u
lt in
u
nreliable meas
u
rements beca
u
se there is no way
to ens
u
re that the inp
u
t signal is within 10 V of COM.
Non-Referenced, Single-Ended (NRSE)
Measurements
Yo
u
can
u
se an NRSE meas
u
rement config
u
ration to take
meas
u
rements on all 32 channels while red
u
cing noise more
effectively than with an RSE connection config
u
ration. This
config
u
ration provides remote sense for the negative (–) inp
u
t of
the PGIA that is shared by all channels config
u
red for NRSE mode.
The behavior of this config
u
ration is similar to the behavior of RSE
connections, b
u
t it provides improved noise rejection. Refer to
Fig
u
re 8 for an ill
u
stration of connecting a device to the NI 9205
u
sing NRSE connections.