National Instruments 1141 用户手册
Appendix A
Specifications
A-2
ni.com
DC gain error ..........................................±0.6% before calibration,
±0.02% after calibration
1
DC input offset .......................................
mV max
Filter Characteristics
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)
20 kHz, 16.7 kHz, 14.3 kHz,
or from external)
Passband ripple
(SCXI-1141 module only) ......................0.2 dB, DC to f
(SCXI-1141 module only) ......................0.2 dB, DC to f
c
Phase matching
(SCXI-1142 only) ...................................3
(SCXI-1142 only) ...................................3
° max error at f
c
Stopband attenuation
SCXI-1141module...........................80 dB at 1.5
× f
c
SCXI-1142 module..........................80 dB at 6
× f
c
SCXI-1143 module..........................80 dB at 3.2
× f
c
Prefilter aliasing rejection.......................> 80 dB below 99
× f
c
> 40 dB above 99
× f
c
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
Gain
------------
+
⎝
⎠
⎛
⎞