92 Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide
5 Math Waveforms
High Pass and Low Pass Filter
The high-pass or low-pass filter functions apply the filter to the selected source
waveform and display the result in the math waveform.
The high-pass filter is a single-pole high-pass filter.
The low-pass filter is a 4th order Bessel-Thompson filter.
Use the Bandwidth field to select the filter's -3 dB cutoff frequency.
Smoothing
The resulting math waveform is the selected source with a normalized rectangular
(boxcar) FIR filter applied.
The boxcar filter is a moving average of adjacent waveform points, where the
number of adjacent points is specified by the Smoothing Points field. You can
choose an odd number of points, from 3 up to half of the analysis record.
The ratio of the input signal's Nyquist frequency and the selected -3 dB cutoff frequency
affects how many points are available in the output, and under some circumstances, there are
no points in the output waveform.
Figure 16 Example of Low Pass Filter
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