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© National Instruments Corp. 25 NI 9237 Operating Instructions and Specifications
Rejection at oversample rate
1
f
s
= 10 kS/s..................................60 dB @ 640 kHz
f
s
= 50 kS/s..................................90 dB @ 3.2 MHz
Common-mode voltage,
all signals to earth ground.................±60 VDC
CMRR
Relative to earth ground
2
(f
in
= 0 to 60 Hz).........................140 dB
Relative to EX–
(f
in
= 0 to 1 kHz).........................85 dB
SFDR (1 kHz, –60 dBFS).................106 dB
Total Harmonic Distortion (THD)
1 kHz, –20 dBFS........................100 dB
8 kHz, –20 dBFS........................90 dB
1
Rejection by analog prefilter of signal frequencies at oversample rate.
2
Measured with a balanced cable. Shielded cables that are not twisted-pair may be
significantly unbalanced. To improve the balance of shielded, twisted-pair cables,
NI recommends twisting together the AI+/AI
– pair, the RS+/RS– pair, and the
EX+/EX
– pair.