NI 9237 Operating Instructions and Specifications
16
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The 150 mW limit allows yo
u
to power half and f
u
ll bridges as
follows:
•
Fo
u
r 350
Ω
half bridges at 5.0 V
•
Fo
u
r 350
Ω
f
u
ll bridges at 3.3 V
•
Fo
u
r 120
Ω
half bridges at 2.5 V
If yo
u
need an excitation voltage that ca
u
ses more than 150 mW to
dissipate across all the bridges,
u
se the EX+ and EX– terminals on
the external excitation voltage connector to connect an external
excitation so
u
rce to the NI 9237.
Understanding NI 9237 Filtering
The NI 9237
u
ses a combination of analog and digital filtering to
provide an acc
u
rate representation of in-band signals while
rejecting o
u
t-of-band signals. The filters discriminate between
signals based on the freq
u
ency range, or bandwidth, of the signal.
The three important bandwidths to consider are the passband, the
stopband, and the alias-free bandwidth.
The NI 9237 represents signals within the passband, as q
u
antified
primarily by passband flatness and phase nonlinearity. All signals
that appear in the alias-free bandwidth are either
u
naliased signals
