DM42- clock losing time

Post here to share useful tips and tricks, to ask questions about using your DM42 or to report software-related problems
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Walter
Posts: 1552
Joined: Tue May 02, 2017 9:13 am
Location: Close to FRA, Germany

Re: DM42- clock losing time

Post by Walter » Wed May 22, 2019 1:23 pm

The clock in my car (optionally) takes the time from DCF77, a radio station controlled by PTB. Thus, exact time all year round incl. DST - works like a charm. 8-)
DM42 SN: 00041 Beta
WP 43S running on this device

HP-35, HP-45, ..., HP-50, WP 34S, WP 31S, DM16L

TwoWeims

Re: DM42- clock losing time

Post by TwoWeims » Wed May 22, 2019 2:53 pm

Great Idea!
Just add wheels and an antenna to the DM42 and problem solved... :lol:

DA74254
Posts: 72
Joined: Tue Oct 03, 2017 9:20 pm
Location: Norway/Latvia

Re: DM42- clock losing time

Post by DA74254 » Wed May 22, 2019 7:03 pm

TwoWeims wrote:
Wed May 22, 2019 2:53 pm
Great Idea!
Just add wheels and an antenna to the DM42 and problem solved... :lol:
:D
Esben
DM42 SN: 00245

keithdalby
Posts: 563
Joined: Mon Apr 24, 2017 6:38 pm

Re: DM42- clock losing time

Post by keithdalby » Wed May 22, 2019 7:52 pm

TwoWeims wrote:
Wed May 22, 2019 2:53 pm
Just add wheels and an antenna to the DM42 and problem solved.
Surely that would just begin a long, tedious discussion about the accuracy of the odometer though?

TwoWeims

Re: DM42- clock losing time

Post by TwoWeims » Wed May 22, 2019 7:57 pm

:lol: :lol: :lol:
keithdalby wrote:
Wed May 22, 2019 7:52 pm
TwoWeims wrote:
Wed May 22, 2019 2:53 pm
Just add wheels and an antenna to the DM42 and problem solved.
Surely that would just begin a long, tedious discussion about the accuracy of the odometer though?

RNav
Posts: 12
Joined: Mon Apr 22, 2019 12:01 pm
Location: Metro Detroit, MI USA

Re: DM42- clock losing time

Post by RNav » Thu May 23, 2019 1:31 am

Crunching numbers... DM42.
Keeping Time... Omega Speedmaster.
Smart people debating the accuracy of a CRYSTAL 32.768kHz, ±20ppm (40ppm variation) IC... PRICELESS!
rps20190522_212254.jpg
rps20190522_212254.jpg (222.52 KiB) Viewed 4219 times
28c, 28s, 48sx, 17bii, 32s, 33s, 35s, Prime, WP-34s, DM42 (daily user)

jthole
Posts: 84
Joined: Mon Nov 27, 2017 7:46 pm
Location: Netherlands

Re: DM42- clock losing time

Post by jthole » Sat Feb 01, 2020 7:48 am

I bet the DM42 (and thus the DM41X) keeps better time than the Speedmaster though! :D

x55
Posts: 16
Joined: Sun Jul 26, 2020 5:32 am

Re: DM42- clock losing time

Post by x55 » Tue Jul 28, 2020 10:44 am

cappy wrote:
Sat Oct 27, 2018 4:43 am
What about colour screen, GPS, wifi and stereo speakers?
My first electronic calculator was an over-pocketsize four-banger with a nixie tube display. It was a very expensive impulse buy while I buying a cheaper (!) Sinclair audio amplifier. The amplifier carried a little "STEREO" sticker. I knew that because it had a "Balance" knob, so I peeled the sticker off the amplifier and put it on the calculator. Electronic amplifiers were still very new but getting to be generally recognisable. Most of the visitors who saw it asked, "Oh - is your calculator a stereo model?" I'd answer, Yes" whereupon they'd go very quiet while they looked at it carefully for several seconds before changing the subject. Highly recommended.

These days, a way of getting NMEA sentences from an external GPS into DM42 storage (matrix?) or even one at a time into the X-register would open a lot of realtime navigation/surveying program possibilities.
--
HP: 55/67/41C/HP-IL/ProtoCODER*/41CL/MLDL**/41CX/16C/71B/42S/33s***/35s ...
DM: 42 ...
Etc: If a calculator has equals, why buy one unless it's the cheapest?
* ProtoTECH, USA / ** Eramco, Netherlands / *** Carly Failurina model

x55
Posts: 16
Joined: Sun Jul 26, 2020 5:32 am

Re: DM42- clock losing time

Post by x55 » Tue Jul 28, 2020 2:04 pm

CNCJerry wrote:
Thu May 09, 2019 4:39 am
When I bought my DM42, I could have sworn there was a note about an RTC or accurate clock.
Jerry
My downloaded destructions say:
3.9. RTC correction
Note that to apply RTC correction you have to know (measure and calculate) ppm drift of calculator
clock first.
Use following steps to apply clock frequency correction. ...
Maybe that's a recent addition?
--
HP: 55/67/41C/HP-IL/ProtoCODER*/41CL/MLDL**/41CX/16C/71B/42S/33s***/35s ...
DM: 42 ...
Etc: If a calculator has equals, why buy one unless it's the cheapest?
* ProtoTECH, USA / ** Eramco, Netherlands / *** Carly Failurina model

whuyse
Posts: 67
Joined: Thu Dec 21, 2017 12:23 pm

Re: DM42- clock losing time

Post by whuyse » Wed Jul 29, 2020 7:51 am

Regarding the RTC correction: if your DM42 clock is fast (i.e. it shows a later time), should the factor C be positive or negative? It's not clear from the description, so I have a 50/50 chance of being right, meaning I'll be wrong ;-)
Werner
42S #3249S01123
DM42 #00345

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