two_pole_dc_pass/HP48_notes.txt

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To get an HP48 ploting the frequerncy response of a
Z transform, first define Z as 'EXP(X*(0,-1)).
i.e.
> 'EXP(X*(0,-1))'
> 'Z'
> STO
Now define a function to convert a Z transform
to ABS and then to DBs
> << ABS LOG10 10 * >>
> '->ABS'
> STO
Now place in a test function say the 7/8ths LAG FILTER
> ' 0.125/(1-0.875*Z)'
> ->ABS
Now store in 'EQ'
Now get the plot menu.
Set yrange to -40 to + 40
Set xrange to 0 to 3.142
PLOT func
The Z transform magnitude response will now be displayed in the
HP48 graph