[SI-LIST] Re: ppm(parts per million)-Crystal OSC
- From: Daniel deAraujo <daniel@xxxxxxxxxx>
- To: bala <balaseven@xxxxxxxxx>
- Date: Mon, 2 Jan 2012 11:44:58 -0600
Bala:
Tolerance (as precision) is indicative of the variability. From
sample to sample, how much does a particular value change? Accuracy is how
close you are to the intended target or true value. You can have low
tolerance/high precision, but be off target, as well as having accuracy
without tight tolerance. Ideally, you want low tolerance and high
accuracy, but this may come at a higher price depending on the requirements.
Sincerely,
* Daniel N. de Araujo
*Director of Applications, *Nimbic*
Electromagnetic Integrity 3D full-wave solutions for SI, PI & EMI
www.nimbic.com
On Mon, Jan 2, 2012 at 7:41 AM, bala <balaseven@xxxxxxxxx> wrote:
> Are tolerance and accuracy same?
> bala
>
> On Thu, Dec 15, 2011 at 2:15 PM, Jayaprabakaran <
> jayaprabakaran.k@xxxxxxxxxxxxxxxxxxx> wrote:
>
> > Hi Hilal and Vikas,
> >
> >
> > Thanks for the clarification.
> >
> >
> >
> > Regards,
> >
> > Jp
> >
> >
> >
> > _____
> >
> > From: vikas dhanda [mailto:vikasdhanda7@xxxxxxxxx]
> > Sent: Thursday, December 15, 2011 1:14 PM
> > To: Jayaprabakaran
> > Cc: si-list@xxxxxxxxxxxxx
> > Subject: Re: [SI-LIST] Re: ppm(parts per million)-Crystal OSC
> >
> >
> >
> > Frequency tolerance (in ppm)=>The Frequency Tolerance of a crystal or
> > oscillator is defined as the initial deviation of the crystal or
> oscillator
> > frequency as compared to the absolute at 25°C like it designed for 25Mhz
> > but
> > measured is 24.999946Mhz So this is the frequency tolerance.
> >
> >
> >
> > Where the
> >
> >
> > Frequency stability is the frequency deviation compared to the measured
> > frequency at 25°C over the defined operating temperature and voltage
> > range.Here we consider 24.999946Mhz as actual frequency (as Measured) and
> > calculate PPM with this Frequency but don't consider 25Mhzfor
> calculation.
> >
> >
> >
> >
> >
> > Regards,
> >
> > Vikas Dhanda
> >
> > On Thu, Dec 15, 2011 at 10:25 AM, Jayaprabakaran
> > <jayaprabakaran.k@xxxxxxxxxxxxxxxxxxx> wrote:
> >
> >
> > Most of the crystals have two ppm values.
> > Frequency tolerance (in ppm) and Frequency stability (in ppm).
> > What are the difference b/w two parameters?
> >
> > Regards,
> > Jayaprabakaran
> >
> >
> > -----Original Message-----
> > From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> > On
> >
> > Behalf Of Mike Poorman (Cascade Engineering Svcs Inc)
> > Sent: Wednesday, December 14, 2011 11:22 PM
> > To: 'si-list@xxxxxxxxxxxxx'
> > Subject: [SI-LIST] Re: ppm(parts per million)-Crystal OSC
> >
> > Think of PPM as a tolerance on the frequency. The smaller the PPM number
> > the more accurate and stable the crystal frequency will be.
> >
> > Mike Poorman
> > EMC Technician
> > Cascade Engineering Services, Inc.,
> > Email: v-mipoor@xxxxxxxxxxxxx
> >
> > This email message may contain confidential and proprietary information.
> > Any unauthorized use is prohibited. If you are not the intended
> recipient,
> > please contact the sender by reply email and destroy all copies of the
> > original message.
> >
> >
> >
> > -----Original Message-----
> > From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> > On
> > Behalf Of bala
> > Sent: Wednesday, December 14, 2011 2:17 AM
> > To: si-list@xxxxxxxxxxxxx
> > Subject: [SI-LIST] ppm(parts per million)-Crystal OSC
> >
> > Hi all,
> > I have a little confusion on PPM vs frequency of Crystal Oscillators.How
> > important is the term 'ppm' than frequency.Why all the datasheets have
> both
> > units,ppm and Hz.Please clarify,Also how much important is the value of
> ppm
> > on the Signal integrity side,if any.Thanks for your time.
> >
> > --
> > bala
> >
> >
> > ------------------------------------------------------------------
> > To unsubscribe from si-list:
> > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
> >
> > or to administer your membership from a web page, go to:
> > //www.freelists.org/webpage/si-list
> >
> > For help:
> > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
> >
> >
> > List technical documents are available at:
> > http://www.si-list.net <http://www.si-list.net/>
> >
> > List archives are viewable at:
> > //www.freelists.org/archives/si-list
> >
> > Old (prior to June 6, 2001) list archives are viewable at:
> > http://www.qsl.net/wb6tpu
> >
> >
> >
> >
> > ------------------------------------------------------------------
> > To unsubscribe from si-list:
> > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
> >
> > or to administer your membership from a web page, go to:
> > //www.freelists.org/webpage/si-list
> >
> > For help:
> > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
> >
> >
> > List technical documents are available at:
> > http://www.si-list.net <http://www.si-list.net/>
> >
> > List archives are viewable at:
> > //www.freelists.org/archives/si-list
> >
> > Old (prior to June 6, 2001) list archives are viewable at:
> > http://www.qsl.net/wb6tpu
> >
> >
> >
> >
> > ------------------------------------------------------------------
> > To unsubscribe from si-list:
> > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
> >
> > or to administer your membership from a web page, go to:
> > //www.freelists.org/webpage/si-list
> >
> > For help:
> > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
> >
> >
> > List technical documents are available at:
> > http://www.si-list.net <http://www.si-list.net/>
> >
> > List archives are viewable at:
> > //www.freelists.org/archives/si-list
> >
> > Old (prior to June 6, 2001) list archives are viewable at:
> > http://www.qsl.net/wb6tpu
> >
> >
> >
> >
> >
> >
> > ------------------------------------------------------------------
> > To unsubscribe from si-list:
> > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
> >
> > or to administer your membership from a web page, go to:
> > //www.freelists.org/webpage/si-list
> >
> > For help:
> > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
> >
> >
> > List technical documents are available at:
> > http://www.si-list.net
> >
> > List archives are viewable at:
> > //www.freelists.org/archives/si-list
> >
> > Old (prior to June 6, 2001) list archives are viewable at:
> > http://www.qsl.net/wb6tpu
> >
> >
> >
>
>
> --
> bala
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> //www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>
> List technical documents are available at:
> http://www.si-list.net
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
>
> Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
>
>
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
