Re: [time-nuts] Car Clock drift - the lowly 32kHz tuning fork crystal specs

ed for a certain temperature coefficient >> work? Can the fork have a crafted tempco? >> >> Bill Hawkins >> >> >> -Original Message- >> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Ron >> Bean >> Sent: Sunday, Apr

Re: [time-nuts] Car Clock drift - the lowly 32kHz tuning fork crystal specs

:05 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Car Clock drift - the lowly 32kHz tuning fork > crystal specs > >> In your case, the car sits in an environment that matches their test >> setup well. In my case ?\200? not so much

Re: [time-nuts] Car Clock drift - the lowly 32kHz tuning fork crystal specs

-Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Ron Bean Sent: Sunday, April 09, 2017 12:05 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Car Clock drift - the lowly 32kHz tuning fork crystal specs In your case

Re: [time-nuts] Car Clock drift - the lowly 32kHz tuning fork crystal specs

Of Ron Bean Sent: Sunday, April 09, 2017 12:05 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Car Clock drift - the lowly 32kHz tuning fork crystal specs >In your case, the car sits in an environment that matches their test >setup well. In my case ?\200?

[time-nuts] Car Clock drift - the lowly 32kHz tuning fork crystal specs

My 30 year old Mercedes has an analog clock in it. I've always been amazed how well it keeps time. A couple of years ago, I set it for daylight savings time in the spring and did not reset it in the winter. Next spring it was still accurate to within the resolution of reading the hands. I

Re: [time-nuts] Car Clock drift - the lowly 32kHz tuning fork crystal specs

Hi Ron: I think HP pioneered that method in one of their hand held calculators (PH35 or PH41)? -- Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html Original Message In your case, the car sits in an environment that matches

Re: [time-nuts] Car Clock drift - the lowly 32kHz tuning fork crystal specs

Interesting that someone would complain their car clock, kept at temperature controlled 25C, runs fast. The manufacturer would set the clock calibration, not at 25C, but at 10C (typical winter temperature) or 40C (average of cool night and baking hot car interior temperature in summer). So one

Re: [time-nuts] Car Clock drift - the lowly 32kHz tuning fork crystal specs

Hi > On Apr 9, 2017, at 11:36 AM, Clint Jay wrote: > > The clocks in my car have been set by the RDS data, DAB data or GPS in the > last five or six I've had. Drift is a thing of the past as long as i listen > to digital radio or the BBC on analogue FM, if i listen to

Re: [time-nuts] Car Clock drift - the lowly 32kHz tuning fork crystal specs

The clocks in my car have been set by the RDS data, DAB data or GPS in the last five or six I've had. Drift is a thing of the past as long as i listen to digital radio or the BBC on analogue FM, if i listen to neither then the clock drifts a couple of seconds a month but it syncs right up withing

Re: [time-nuts] Car Clock drift - the lowly 32kHz tuning fork crystal specs

>In your case, the car sits in an environment that matches their test >setup well. In my case �\200� not so much. FWIW, mine drifts pretty badly. It's in an aftermarket stereo, and I don't remember when I bought it (I moved it from my previous car). I assume that all quartz clocks and watches

Re: [time-nuts] Car Clock drift - the lowly 32kHz tuning fork crystal specs

On Sun, Apr 9, 2017 at 4:45 AM, Tim Shoppa wrote: > I've had only a few different cars over the past 25 years but I've been > impressed with how accurate their mass-market built-in clocks are, Have you always lived in the same place. What is the average year round temperature

Re: [time-nuts] Car Clock drift - the lowly 32kHz tuning fork crystal specs

The trim method that stands out from memory for generic RTC chips is to cycle stall or double clock, x cycles every 60 seconds. Yielding 0.5 ppm trim resolution. On Sun, Apr 9, 2017 at 7:45 AM, Tim Shoppa wrote: > I've had only a few different cars over the past 25 years but

Re: [time-nuts] Car Clock drift - the lowly 32kHz tuning fork crystal specs

Good quartz watches are, indeed, temperature compensated. More info here: http://forums.watchuseek.com/f9/thermocompensation-methods-movements-2087.html#/topics/2087?page=1 Of much greater interest to watch nerds like me is the improvement of accuracy in mechanical watch movements. Serious watch

Re: [time-nuts] Car Clock drift - the lowly 32kHz tuning fork crystal specs

Hi In my “test environment” car clocks always run fast. That’s been true for many decades over many manufacturers. The idea of putting in an offset on a timekeeping device is an old one. You run the beast over the “expected” temperature (and other environmental) range. You observe how fast or

Re: [time-nuts] Car Clock drift - the lowly 32kHz tuning fork crystal specs

On Sun, 9 Apr 2017 07:45:23 -0400 Tim Shoppa wrote: > So my conclusion, is that all these car clocks must be temperature > compensated. And they must've been doing this for several decades at this > point. Yes, definitely. Although in the 80s it was only the higher class

Re: [time-nuts] Car Clock drift - the lowly 32kHz tuning fork crystal specs

>I only set the car clock twice a year, at daylight savings time changes. >Yet between daylight savings time changes, the car clock never drifts by >more than a minute. Just to testify that I do exactly the same on the clock of my old mercedes. I' ve alwais been unable to estimate the half-year

[time-nuts] Car Clock drift - the lowly 32kHz tuning fork crystal specs

I've had only a few different cars over the past 25 years but I've been impressed with how accurate their mass-market built-in clocks are, especially considering the wide and completely uncontrolled temperature range. In the winter the interior of the car gets down below freezing most mornings,