Oscilloscope Reference Math arbitrary filters
Frequency response of the available band stop filters
The following table lists the available normalized band stop filters:
File na me Normalized bandwidth
Normalized center frequency
bandstop_0.1bw_0.10center.flt
0.1 0.10
bandstop_0.1bw_0.15center.flt
0.1 0.15
bandstop_0.1bw_0.20center.flt
0.1 0.20
bandstop_0.1bw_0.25center.flt
0.1 0.25
bandstop_0.1bw_0.30center.flt
0.1 0.30
bandstop_0.1bw_0.35center.flt
0.1 0.35
bandstop_0.1bw_0.40center.flt
0.1 0.40
xxx
Smoothing filters
These are sometimes called box car filters. They simply average together adjacent samples along the time
record. The filter coefficients for these filters are all equal to 1/ M where M is the length of the filter. The
name of the files indicates the length of the smoothing filter.
Smoothing filters are low pass filters with a somewhat less than optimal stop band characteristic. H owever,
they are commonly used to remove high frequency noise from a displayed trace. Take care in using to
insure that the pass band of the signal you are filtering is well within the pass band of the filter you
choose. That will insure that only noise is removed. Lengths of 3, 5, 10, 20, 50, 100, and 200 are p rovided
in the library. The red trace is for filter length 3, followed by blue trace at 5, followed by magenta trace
for 10, and so on.
DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series 861
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