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NI USB-9237 User Guide and Specifications 18 ni.com
Stopband
Frequency ........................................0.55 · f
s
Rejection..........................................100 dB
Alias-free bandwidth ..............................0.45 · f
s
Oversample rate ......................................64 · f
s
Rejection at oversample rate
1
50 kS/s ......................................90 dB @ 3.2 MHz
10 kS/s ......................................60 dB @ 640 kHz
Common-mode voltage
All signals to earth ground ..............± 60 VDC
Common-mode rejection ratio (CMRR)
Relative to earth ground
2
.................140 dB @ 0 to 60 Hz
Relative to EX– ...............................85 dB @ 0 to 1 kH
Input noise
Spurious-free dynamic
range (SFDR)..........................................106 dB,
(1 KHz, –60 dBFS)
Total harmonic distortion (fundamental @ –20 dBFS)
1 kHz ...............................................100 dB
8 kHz ...............................................90 dB
Excitation noise ......................................0.1 mV/V
rms
1
Rejection by analog prefilter of signal frequencies at oversample rate.
2
Measured with a balanced cable. Shielded cables may be significantly unbalanced.
Excitation
Voltage
Density
(nV/V
rms
per
)
Tota l
(50 kS/S)
(μV/V
rms
)
0 to 1 kHz
(nV/V
rms
)
2.5 V 8 1.3 250
3.3 V 6 1.0 190
5V 4 0.6 130
10 V 2 0.3 65
1Hz