This is a multi-part message in MIME format.

------=_NextPart_000_001B_01C42303.D52A26C0
Content-Type: text/plain;
        charset="Windows-1252"
Content-Transfer-Encoding: 7bit

Thank you Alan and Jan-Erik.
If I where preoccupied about the +/-1 you'd probably LOL seeing my face
when the motor encoder was connected!

I wonder how can I filter THAT signal in 20ms or 10ms to apply some pi
control!

But don't worry by now, I'll figure it out.
In the mean time I send to you the captures between 100ms each with the
oscilator and with the motor.


Thanks,
Dennis Crawley
Argentina

----- Original Message -----
From: "Alan B. Pearce" <A.B.Pearce@RL.AC.UK>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, April 15, 2004 8:54 AM
Subject: Re: [PIC:] Capture


> >Is it normal that the capture module varies ~1 unit
> >the capture of an stable sqare signal in all
> >the range of frecuencies?
> >4000Hz 250 and  251
> >2000Hz 500 and  501
> >800Hz 1250 and 1251
> >What this capture means?
> >There is something wrong in my interrupt routine?
>
> Nothing wrong, just that your sampling and the measured signal are not
> synchronous.
>
> Any digital measurement system is likely to show +/-1 in the least
> significant digit over a number of measurements for a stable input signal
> unless there is some special synchronising hardware to make sure the
> measurement always starts at a given point on the measured waveform. Even
> then at certain points there will be some uncertainty which will cause
what
> you are seeing.
>
> --
> http://www.piclist.com hint: To leave the PICList
> mailto:piclist-unsubscribe-request@mitvma.mit.edu


--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu



------=_NextPart_000_001B_01C42303.D52A26C0
Content-Type: application/x-zip-compressed;
        name="logs.zip"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
        filename="logs.zip"
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------=_NextPart_000_001B_01C42303.D52A26C0--