National Instruments SCC-LP04 用户手册
SCC-LP Series Lowpass Filter Modules User Guide
14
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The horizontal axes of the first two plots are normalized to the SCC-LPXX
cutoff frequency. When the input frequency (f) equals the cutoff frequency
(fc), the normalized frequency has a value of 1.
cutoff frequency. When the input frequency (f) equals the cutoff frequency
(fc), the normalized frequency has a value of 1.
The vertical axis of the third plot is normalized to the magnitude of the step
input voltage. When the step-response output voltage equals the magnitude
of the step-input voltage, the normalized step response is 1 V
input voltage. When the step-response output voltage equals the magnitude
of the step-input voltage, the normalized step response is 1 V
OUT
/V
IN
.
Figure 6a shows that the SCC-LPXX provides 80 dB attenuation above
ten times the cutoff frequency. Figure 6b shows variation in the group
delay of the SCC-LPXX. Figure 6c shows the SCC-LPXX response to a
step input. As shown, the peak voltage of the output is greater than the
magnitude of the step input. If you expect step inputs, choose a gain setting
and input range on the E Series DAQ device that allow for the effects of
ringing. Otherwise the DAQ device input may be saturated, resulting in
invalid data.
ten times the cutoff frequency. Figure 6b shows variation in the group
delay of the SCC-LPXX. Figure 6c shows the SCC-LPXX response to a
step input. As shown, the peak voltage of the output is greater than the
magnitude of the step input. If you expect step inputs, choose a gain setting
and input range on the E Series DAQ device that allow for the effects of
ringing. Otherwise the DAQ device input may be saturated, resulting in
invalid data.