Re: "Normal" crystal amplitude
From: colin (no.spam.for.me_at_ntlworld.com)
Date: 07/20/04
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Date: Tue, 20 Jul 2004 14:18:11 GMT
"Rich Grise" <null@example.net> wrote in message
news:MS6Lc.9092$Iz3.620@nwrddc01.gnilink.net...
> Tim Wescott wrote:
>
> > colin wrote:
> >
> >> its all a trade off, you need a certain amount of drive in order for it
> >> to start up properly etc, but too much drive and it will eventualy
damage
> ...
> >> "Richard" <rh86@no.spam> wrote in message
> >> news:40FB7338.3FBA565E@no.spam...
> >>
> >>>Should the sine wave from a crystal normally swing the full range from
0
> >>>to Vcc? (i.e., 3.3V p-p for a 3.3V supply)
>
> > When I want to get an idea of the amplitudes in an oscillator I'll make
> > a 11:1 capacitive divider (C in series with 10C) for the scope probe.
> > This keeps the scope from messing up the amplitudes in the circuit (or
> > stopping the oscillator altogether).
> >
> > I don't know if it's the _right_ way, but it works well for me.
> >
>
> It's probably pretty close, since that's the way 10X scope probes
> work. :-)
> --
> Cheers!
> Rich
>
yes i was thinking that, maybe he use that with a x10 probe? i also have a
x100 probe but i dont often think of using it. i also hook one chanel on the
output and see how much it changes when i hook onto the input too, gives me
some idea of how much ive afected the input.
a curent probe isnt too dificult to make either but most of my projects arnt
comercial so i dont care too much about long term crystal damage just whack
them as much as necessary.
Colin =^.^=
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