Oscilloscope Reference Math arbitrary filters
Frequen
cy response of the differentiator filter
This se
ction describes the ASCII file format for storing filters for use in the Tektronix oscilloscope
waveform math section. A filter menu function allows the u ser to specify a disk fi le name containing the
filter. A single file format allows the user to specify a different set of coefficients for each sample rate that
the filter operates at. If the desired sample rate is not in the file list, then the filter will not be applied to the
data. The file format also allows the user to specify that the set of filter coefficients is normalized. This
allows the same set of filter coefficients to operate at all sample rates.
The ASCII file format is specified as follows:
# Comm ents are preceded by # s ymbol
< samp leRate > coef1, coef2, …. coefN
< samp leRate > coef1, coef2, …. coefN
||
||
<s
ampleRate > coef1, coef2, …. coefN
Each set of filter coefficients in a file are specified in one row preceded by the sample rate value at which
t
hat set will operate. If the user specifies the @ symbol for the sample rate then the filter will operate at all
sample rates. If the @ symbol is specified then there should only be one set of filter coefficients in the file.
However, the user may have other rows with sample rates specified and they will be ignored. There will be
a separate row for each sample ra t e the filter is to operate at. Each row may have a different number of
coefficients with a maximum of 1000. The filemaycontainupto20rows.
864 DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series
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