RTC Calibration program

Contributions to this software library are always welcome. Please ensure that you post program listings rather than .raw files. They give a reasonable idea of what your program does without having to load them into a DM42 and you can also include comments in your code. Check out the following link for a decoder/encoder: http://www.swissmicros.com/dm42/decoder/

You can then copy/paste the listing and post it in "code" tags.
cdmackay
Posts: 150
Joined: Fri Oct 05, 2018 8:33 pm
Location: Cambridge, UK
Contact:

Re: RTC Calibration program

Post by cdmackay » Sun Apr 12, 2020 10:38 pm

Does anyone know at what point the ppm display under Setup — Settings gets updated, after changing the rtccalib.cfg file?

I've just edited my file, changing from -21 to -22, but the display is still showing -21ppm.

I've double-checked the file content (on a PC), turned the DM42 off/on a few times: still the same.
Cambridge, UK
41CL/DM41X 12/15C/16C DM15/16 71B 17B/BII/bII+ 28S 42S/DM42 32SII 48GX 50g 35s 30b/WP34S Prime G2
& Casios, Rockwell 18R :)

User avatar
ijabbott
Posts: 187
Joined: Fri Dec 15, 2017 2:34 pm
Location: GB-MAN

Re: RTC Calibration program

Post by ijabbott » Mon Apr 13, 2020 1:55 am

cdmackay wrote:
Sun Apr 12, 2020 10:38 pm
Does anyone know at what point the ppm display under Setup — Settings gets updated, after changing the rtccalib.cfg file?

I've just edited my file, changing from -21 to -22, but the display is still showing -21ppm.

I've double-checked the file content (on a PC), turned the DM42 off/on a few times: still the same.
The values in /rtccalib.cfg aren't quite in ppm. The PPM value is about 95.3674% of the calbration value.

cdmackay
Posts: 150
Joined: Fri Oct 05, 2018 8:33 pm
Location: Cambridge, UK
Contact:

Re: RTC Calibration program

Post by cdmackay » Mon Apr 13, 2020 2:41 am

ijabbott wrote:
Mon Apr 13, 2020 1:55 am
The values in /rtccalib.cfg aren't quite in ppm. The PPM value is about 95.3674% of the calbration value.
ah! that rings a bell, thanks very much :)
Cambridge, UK
41CL/DM41X 12/15C/16C DM15/16 71B 17B/BII/bII+ 28S 42S/DM42 32SII 48GX 50g 35s 30b/WP34S Prime G2
& Casios, Rockwell 18R :)

Post Reply