National Instruments 1141 用户手册

DC gain error ..........................................±0.6% before calibration, 

±0.02% after calibration

1

DC input offset .......................................

mV max

Filter type

SCXI-1141 module..........................8th-order elliptic

SCXI-1142 module..........................8th-order Bessel

SCXI-1143 module..........................8th-order Butterworth

Filter architecture....................................Switched capacitor with prefilters 

and postfilters

Rolloff rate..............................................135 dB/octave

Cutoff frequency (f

c

) range.....................10 Hz to 25 kHz

Cutoff choices (software-selectable) ......Divided from 100 kHz or external 

clock (for example, 25 kHz, 
20 kHz, 16.7 kHz, 14.3 kHz, 
or from external)

Passband ripple
(SCXI-1141 module only) ......................0.2 dB, DC to f

Phase matching
(SCXI-1142 only) ...................................3

° max error at f

Stopband attenuation

SCXI-1141module...........................80 dB at 1.5 

× f

SCXI-1142 module..........................80 dB at 6 

× f

SCXI-1143 module..........................80 dB at 3.2 

× f

Prefilter aliasing rejection.......................> 80 dB below 99 

× f

> 40 dB above 99 

× f

Sampled image + clock feedthrough ......<–75 dB

1   

SCXI-1141/1142/1143 module factory calibration conditions: V

in

(–) = 0 V, V

in

(+) = ±fullscale

10

9.5

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+

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