On Dec 2, 2011, at 4:12 PM, Azelio Boriani wrote:
> Man, what should we follow if not the manufacturer datasheet? Everyone can
> [...]
Oh, I have an active imagination and tried a 1/2 dozen different ideas.
But, lesson learned!
Kevin
___
time-nuts ma
Man, what should we follow if not the manufacturer datasheet? Everyone can
predict that the best results are obtained following the component's
datasheet. Indeed maybe, after having followed the datasheet, that you can
improve something.
On Fri, Dec 2, 2011 at 11:51 PM, Kevin Rosenberg wrote:
> O
On Dec 2, 2011, at 10:59 AM, Hal Murray wrote:
> I've been playing with one of the Dallas DS32KHZ parts. I'm guessing you are
> [...]
> Another possibility is that I didn't ground the NC pins. (I didn't notice
> that in the data sheet until I read it again looking for crap like that.)
Using a
> The need for this is that the RTC chip for a product has the engaging
> property of shifting it's frequency by several ppm after being soldered to
> the board, and I need to characterise this to get accurate timing for the
> product.
Are you sure you have the exact same setup?
Have you tried
mike cook wrote:
Le 02/12/2011 01:53, Bob Camp a écrit :
Hi
Ok, 62.5 ppb at 1 second would be 62.5 ns. that sounds right for a 16
MHz clock.
Your accuracy will be related to the offset between the two 1 ops
events (divided TCXO and GPS PPS) and the accuracy of your crystal.
With some luck
our arrangement.
Best regards
Ulrich Bangert
> -Ursprungliche Nachricht-
> Von: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] Im Auftrag von Tom Harris
> Gesendet: Freitag, 2. Dezember 2011 01:41
> An: time-nuts@febo.com
> Betreff: [time-nuts] Using GP
I agree: better using a cheap counter (using the GPSDO to sync it). However
to do a time interval measurement your sampling frequency must be stable
enough between the reference PPS and the PPS-under-measure. The trick is to
offset the PPS-under-mesure enough (say 100mS) to gether some stable
sampl
Le 02/12/2011 01:53, Bob Camp a écrit :
Hi
Ok, 62.5 ppb at 1 second would be 62.5 ns. that sounds right for a 16 MHz clock.
Your accuracy will be related to the offset between the two 1 ops events
(divided TCXO and GPS PPS) and the accuracy of your crystal.
With some luck you can get the crys
Hi
Is your GPS module a GPSDO or is it something more basic? If it's a GPSDO, then
it's accuracy is not an issue. If it's a basic navigation board, then it could
easily be off by enough to impact the results.
Bob
On Dec 1, 2011, at 7:41 PM, Tom Harris wrote:
> I finally have a need to ask a q
Hi
Ok, 62.5 ppb at 1 second would be 62.5 ns. that sounds right for a 16 MHz
clock.
Your accuracy will be related to the offset between the two 1 ops events
(divided TCXO and GPS PPS) and the accuracy of your crystal.
With some luck you can get the crystal frequency to < 1 ppm by counting it
I finally have a need to ask a question about time measurement!
I want to measure the accuracy of a 1Hz signal from a real time clock
(RTC) chip with an integrated TXCO allegedly good for +/- 2ppm
accuracy. My employer is too tight to buy a good frequency counter,
but I do have a GPS module output
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