National Instruments 24-Bit Half/Full-Bridge Analog Input Module NI 9237 - Manual (Page 25)

© 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.