© National Instruments Corp.
9
NI 9229/9239
The NI 9229/9239 has fo
u
r 2-terminal detachable screw-terminal
connectors.
Note
Yo
u
m
u
st
u
se 2-wire ferr
u
les to create a sec
u
re
connection when connecting more than one wire to a
single terminal on the NI 9229/9239.
Yo
u
can connect gro
u
nd-referenced or floating signal so
u
rces to
the NI 9229/9239. Connect the positive signal of the signal so
u
rce
to the AI+ terminal or connector, and connect the negative signal
of the signal so
u
rce to the AI– terminal or connector. If yo
u
make
a gro
u
nd-referenced connection between the signal so
u
rce and the
NI 9229/9239, make s
u
re the voltage on the AI+ and AI–
connections are in the channel-to-earth safety voltage range to
ens
u
re proper operation of the NI 9229/9239. Refer to the
section for more information abo
u
t operating
voltages and overvoltage protection. Refer to Fig
u
ill
u
strations of how to connect gro
u
nded and floating signal
so
u
rces to the NI 9229/9239.