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Re: DM42- clock losing time

Posted: Mon May 13, 2019 2:38 am
by rprosperi
Walter wrote:
Sun May 12, 2019 10:55 pm
rprosperi wrote:
Sun May 12, 2019 10:37 pm
All the original 41 versions (CX or module) included a crystal, were reasonably accurate ...
What does this mean in numbers?
Every machine was different (I guess due to the other components in the 41 as well as mfg. variations) but as I recall, for my 41CX drift was about 1 minute in a month or so, but only as compared to other time sources which were not absolute either. In the military, I occasionally had access to 'official' clocks, but being official did not mean they were necessarily accurate.

Before PCs had access to time servers, NIS-managed cesium clocks, etc. all clocks varied, we just never knew. Or cared.

Leaving obsession and other personality quirks aside, I can't think of a reason the clock in a calculator would ever need to be more accurate than the levels being reported here. 6 minutes in a month does seem like it could be noticeable, but only if you compare it to some other time source you know is better, in which case you have access to a time source you know is better, and can adjust the DM42. So, no problem, right?

Re: DM42- clock losing time

Posted: Mon May 13, 2019 4:13 am
by rkf
Hans S. wrote:
Sun May 12, 2019 12:01 pm
Jebem wrote:
Sat May 11, 2019 7:03 pm
the worst case scenario for the reported clock issues should be around 6 minutes after 6 months.
Should... I could throw in the ring 38 minutes loss after 14 months.

Hans
8 seconds after 3 days for me, which extrapolates to about 8 minutes after 6 months.

Re: DM42- clock losing time

Posted: Mon May 13, 2019 4:55 pm
by ijabbott
I'm pretty sure the last time I set mine was sometime on 31st March (when the clocks went forward in the EU), and it is currently running 86 seconds fast after 43 days, so that's about 2 seconds per day in my case.

Re: DM42- clock losing time

Posted: Mon May 13, 2019 7:20 pm
by DA74254
I set my clock on the DM42 when I received it. The first batch in December 2017 (I think).
As H2X, I've never bothered about an accurate time on my calc. I have a smartphone and several PC's for that, in addition to several GPSr's as well.

Anyway, it is now, after abt a year and a half, 3-4 minutes ahead of my internet/satellite adjusted devices.

Re: DM42- clock losing time

Posted: Tue May 14, 2019 8:37 am
by rkf
rkf wrote:
Mon May 13, 2019 4:13 am
...
8 seconds after 3 days for me, which extrapolates to about 8 minutes after 6 months.
By the way, let's not forget about other (HP) hardware. E.g. the clock of my HP50g was adjusted last time 31st of March (switch to DST), and is now 91 seconds slow. That's (circa 6 minutes after 6 months) only a tiny bit better than my DM42, but has the same order of magnitude. Thus, no need to worry.

Re: DM42- clock losing time

Posted: Tue May 14, 2019 12:15 pm
by Logan
Mine is from Dec 2017 as well. I set the clock initially but then realized I really didn't care to see it displayed and haven't looked at it since. Currently about 6 minutes fast.

It doesn't bother me. Not even sure why there needs to be a clock on the calculator. I'll use my calculator for calculations and my atomic radio-watch for keeping time :)

Re: DM42- clock losing time

Posted: Tue May 14, 2019 6:34 pm
by Joe Horn
One more data point: 1 week after setting it exactly, my DM42 (SN: 00609) is 5.25 seconds fast. So that's about 22 seconds fast per month, which is better than some quartz crystal watches I've owned.

Re: DM42- clock losing time

Posted: Tue May 14, 2019 7:09 pm
by keithdalby
Ah yes, but what was the average temperature? Humidity? Where in the lunar cycle are we? What was the background radiation during this period? These are all important to know as well.

Re: DM42- clock losing time

Posted: Tue May 14, 2019 9:51 pm
by TwoWeims
Mine keeps perfect time until I put it in the case. Then the pendulum stops swinging. :oops:

Re: DM42- clock losing time

Posted: Wed May 15, 2019 1:31 am
by RNav
keithdalby wrote:
Tue May 14, 2019 7:09 pm
Ah yes, but what was the average temperature? Humidity? Where in the lunar cycle are we? What was the background radiation during this period? These are all important to know as well.
:lol: :lol: :lol: