Crystal "calibration" - how to (a simple way)?

[Acetronics2]

Hi, Flotul

The best and easier way is to buy quality crystals ... ( from Farnell i.e...).

The second way is to use External DIP oscillators ...

The Third way is to buy a good Freq meter ....

I also think you can get precise 10 Mhz by radio ... ( see Radio ham ...)

You can also correct time every minute with a DCF module !!!


What I usually do is to play with the timer preload value ... fits most of time !!!


One of the electronician's main headache has always been to have home good references ... ( Volt, freq, temp,pressure ...humidity ( LOL ! ) )

Alain

[flotulopex]

Thanks Joe S,

Today I build a battery charger and tomorrow, what will it be? I just take the opportunity of this circuit to learn a little more about the accuracy my PIC can (or could) have.

Of course, there is absolutely no need to have a lab's chronograph to charge batteries...

Merci Alain. What is your measuring point to evaluate your precision? Is it a port as I mentionned in post#3?

[Acetronics2]

Hi, Roger

With time, I have built or bought ( thanks to Trent !!! ... LOL ) all the references I need.

For Frequency ... I Bought ( God bless you, Trent ) a nice Discrete components meter 20 Years ago ... still accurate !!!


Most of time, I verify clocks accuracy ... letting them run for a week !!! ( DCF clock as a reference ...)

Seriously : ... after having made a "rough tuning" during an hour or a day ...

Alain

[flotulopex]

...rien de tel que la pratique!!!

Thank you Alain and have a nice day.

[Acetronics2]

Yes !

And that includes temp, Humidity and voltage variations along a "significant" period ...

Amitiés

Alain