Does the 41X have a low resolution crystal, like the DM42?

Discussion about the new DM41X calculator
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cappy
Posts: 90
Joined: Sun Jul 30, 2017 7:30 pm

Does the 41X have a low resolution crystal, like the DM42?

Post by cappy » Sun Oct 11, 2020 7:16 am

I posted a message in the DM42 forums about my 42 real time clock losing time when not being used for months.
The responses indicated that the crystal oscillator wasn’t precise enough to accurately keep time over a long period.
I’m curious if the 41X has a similar low precision crystal oscillator.

Here is that original post, for reference.
viewtopic.php?t=2007
DM42 SN: 0612

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akaTB
Posts: 522
Joined: Tue May 02, 2017 1:56 pm
Location: Milan, Italy

Re: Does the 41X have a low resolution crystal, like the DM42?

Post by akaTB » Sun Oct 11, 2020 10:24 am

cappy wrote:
Sun Oct 11, 2020 7:16 am
I posted a message in the DM42 forums about my 42 real time clock losing time when not being used for months.
The responses indicated that the crystal oscillator wasn’t precise enough to accurately keep time over a long period.
I’m curious if the 41X has a similar low precision crystal oscillator.

Here is that original post, for reference.
viewtopic.php?t=2007
Quite accurate if you set the right accuracy factor with the CORRECT function.
Greetings,
    Massimo
ajcaton
-+×÷ left is right and right is wrong :twisted: Casted in gold

EM41
Posts: 134
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Location: Overijssel Netherlands

Re: Does the 41X have a low resolution crystal, like the DM42?

Post by EM41 » Sun Oct 11, 2020 8:08 pm

Well actually the CORRECT function doesn't work because the hardware isn't there, i asked myself the same question some time ago.
viewtopic.php?f=26&t=2522
But you can copy the file rtccalib.cfg to the root of the FAT disk.
You write the correction factor in this file, the right factor you can conveniently calculate with this spreadsheet https://www.cjoint.com/doc/20_08/JHjgDj ... ection.xls made by over_score.
I have less than a second drift in two months now with my 3 DM calcs with correction, out of the box its a few seconds a day.
HP41C (2x), HP41CV, HP41CX, DM41X β, DM41X, DM42, HP11C, HP48G, HP97

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akaTB
Posts: 522
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Location: Milan, Italy

Re: Does the 41X have a low resolution crystal, like the DM42?

Post by akaTB » Sun Oct 11, 2020 8:18 pm

EM41 wrote:
Sun Oct 11, 2020 8:08 pm
Well actually the CORRECT function doesn't work because the hardware isn't there, i asked myself the same question some time ago.
viewtopic.php?f=26&t=2522
But you can copy the file rtccalib.cfg to the root of the FAT disk.
You write the correction factor in this file, the right factor you can conveniently calculate with this spreadsheet https://www.cjoint.com/doc/20_08/JHjgDj ... ection.xls made by over_score.
I have less than a second drift in two months now with my 3 DM calcs with correction, out of the box its a few seconds a day.
Ooops, sorry! :oops:
I forgot that I also have the rtccalib.cfg file, so correct seemed to work.
Greetings,
    Massimo
ajcaton
-+×÷ left is right and right is wrong :twisted: Casted in gold

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