DM42- clock losing time
Re: DM42- clock losing time
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.
WP43 SN00000, 34S, and 31S for obvious reasons; HP-35, 45, ..., 35S, 15CE, DM16L S/N# 00093, DM42β SN:00041
Re: DM42- clock losing time
Great Idea!
Just add wheels and an antenna to the DM42 and problem solved...
Just add wheels and an antenna to the DM42 and problem solved...
Re: DM42- clock losing time
Esben
DM42 SN: 00245, WP43 Pilot SN:00002, DM32 SN: 00045 (Listed in obtained order).
DM42 SN: 00245, WP43 Pilot SN:00002, DM32 SN: 00045 (Listed in obtained order).
-
- Posts: 564
- Joined: Mon Apr 24, 2017 8:38 pm
Re: DM42- clock losing time
keithdalby wrote: ↑Wed May 22, 2019 9:52 pmSurely that would just begin a long, tedious discussion about the accuracy of the odometer though?
Re: DM42- clock losing time
Crunching numbers... DM42.
Keeping Time... Omega Speedmaster.
Smart people debating the accuracy of a CRYSTAL 32.768kHz, ±20ppm (40ppm variation) IC... PRICELESS!
Keeping Time... Omega Speedmaster.
Smart people debating the accuracy of a CRYSTAL 32.768kHz, ±20ppm (40ppm variation) IC... PRICELESS!
28c, 28s, 48sx, 17bii, 32s, 33s, 35s, Prime, WP-34s, DM42 (daily user)
Re: DM42- clock losing time
I bet the DM42 (and thus the DM41X) keeps better time than the Speedmaster though!
DM42 s/n 06181 DM41X s/n \(\beta\)0005 (sold)
Re: DM42- clock losing time
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
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
Re: DM42- clock losing time
My downloaded destructions say:
Maybe that's a recent addition?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. ...
--
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
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
Re: DM42- clock losing time
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
Werner
41CV†,42S,48GX,49G,DM42,DM41X,17BII,15CE, DM15L