Syscomp Scope and application

[Mike Sulzer]

A wrote an e-mail (a month ago) to Peter @Syscomp asking him how to obtain a better graphic.
He answer this:
"What you would do is save the data from the network analyser response to a
file, which, if I remember correctly, you can do from one of the menus.
(Maybe Tools -> Export Waveform).

Then you would load that data into a spreadsheet. Create a new column that
multiplies the amplitude readings by 1/f. Then plot this new column."

So...
I plot my pickup with the network analyser, and then I exported.
The file had 3 columns: Frequency, Magnitude, phase, and Quality.
So I did another column with Mag*(1/Freq).
I could not re-plotted with the syscomp application, so i tried with Excel application but I think I did not have the expected results.
Maybe is the Excel app.?

Not sure exactly what you are doing, but if the magnitude are in db, then what you need to do is subtract from the magnitude, not divide. Subtract a column that is a straight line that increases by 20 as the frequency increases by a factor of ten. (The natural response of the pickup increases by 20 db/decade, that is decade of frequency increase.)

[mickmutante]

Mike,
Based on the thread you post, Making good measurements with imperfect driver coils, I asked to Peter how to do this type of graphic with the Syscomp application, and he give those instructions.

[Mike Sulzer]

Mike,
Based on the thread you post, Making good measurements with imperfect driver coils, I asked to Peter how to do this type of graphic with the Syscomp application, and he give those instructions.

Yes. What I described was for when your amplitude data are in linear form, that is, not converted to db. I suspect you are working with db, but I do not know. Also, the main point of that thread was how to get accurate data even when the driver coil changes from resistive to inductive in the audio band pass. This requires using cross spectral analysis. I do not know if Syscomp does that.