How to make a delay time versus frequency graph?

[magic_finger@my-deja.com]

Hi all,

I'm trying to create a waveformgraph which
displays delay time versus frequency.
What I'm doing? I try to measure a filter, the
type is not important. On the input of the filter
white noise is applied. Both input and output of
the filter are measured with a Tektronic TDS-210
oscilloscope. In Labview both channels of the
scope are read and with the help of the Network
Functions (avg).vi the average phase and
frequency response is computed. The measurements
is represented in a magnitude and phase
waveformgraph.
All is okay....
However instead of the phase I would like to see
a "delay as function of the frequency" graph.
Since the delay is the result of both phase and
frequency how can I calculate this
and represent
this in a graph (or plot ?)?

If you have an answer, please e-mail me to
horsten@optica.tn.tudelft.nl

Thanks,

Roland Horsten


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[Pierre Meyer]

The measurements
> is represented in a magnitude and phase
> waveformgraph.
> All is okay....
> However instead of the phase I would like to see
> a "delay as function of the frequency" graph.
> Since the delay is the result of both phase and
> frequency how can I calculate this and represent
> this in a graph (or plot ?)?
Hello,

I'm not sure to understand where the problem lies.
You have already phase (and magnitude) as a function of frequency (I
hope, because you didn't say specifically). It is very simple to
calculate from phase and frequency the delay (time, I hope you meant)
and display them it in another graph.
Exactly where is your difficulty?

--
P. Meyer
Universite de Paris Sud
Physique des Solides, bt. 510
e-mail : meyer@lps.u-psud.fr
T : (33) (0)1 69 15 6
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