National Instruments SCC-LP04 用户手册
© National Instruments Corporation
7
SCC-LP Series Lowpass Filter Modules User Guide
Input bias current
................................... ±2 nA typ
±5 nA max
1
Nonlinearity ........................................... 0.004% of full scale
Filter Characteristics
Filter type ............................................... Fourth-order Butterworth
lowpass
Rolloff rate ............................................. 80 dB/decade
–3 dB cutoff frequency (fc)
SCC-LP01 ....................................... 25 Hz
SCC-LP02 ....................................... 50 Hz
SCC-LP03 ....................................... 150 Hz
SCC-LP04 ....................................... 1 kHz
Passband ripple
System Noise
Total harmonic distortion (THD) at fc
... < –90 dB
Wide-band noise
(DC to 1 MHz, RTI)............................... 100
(DC to 1 MHz, RTI)............................... 100
µV
rms
Narrow-band noise
(DC to 33 kHz, RTI) .............................. 6
(DC to 33 kHz, RTI) .............................. 6
µV
rms
1
Applicable at 25 °C.
Input Signal
Typical
Maximum
DC to 1/3 fc
±0.04 dB
0
± 0.1 dB
DC to 1/2 fc
±0.06 dB
0
± 0.2 dB
DC to 2/3 fc
–0.2
± 0.25 dB
–0.2
± 0.4 dB
DC to fc
–3
± 0.3 dB
–3
± 0.5 dB