WP34s Differential Time and shift
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02-10-2015, 01:29 AM
(This post was last modified: 02-11-2015 08:20 PM by matthiaspaul.)
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RE: WP34s Differential Time and shift
(02-09-2015 11:43 PM)MarkHaysHarris777 Wrote: I am noticing that the time shift for my WP34s is almost precisely 1 sec fast per day; half minute fast per month (on average). A program can be written which based on the date and 34s time, along with the difference time in a second time piece (input data) could then reset the 34s for correct present time eliminating the shift mostly.In fact, some decades ago I wrote a small DOS utility named CORRTIME to silently correct the RTC time of a PC on every bootup and further adjust its correction factor whenever the clock was set manually. So, yes, it's definitely doable... ;-) However, from the electrical design perspective the correct solution is what Katie suggests, "pulling" the crystal with a trimmer cap. (Of course, there are other solutions as well, but they consume more energy and are therefore not well-suited for a calculator powered by coin cells.) Quote:and whether it would be easy to have the firmware (configurable) be able to adjust for the shiftHm, a function to receive a time packet from an attached emulator running on a PC (and having an NTP, GPS, DCF77, RDS etc. synchronized time) might be a nice feature. Either by setting a special "synch time" flag and working silently in the background, or by issuing a specific command. Greetings, Matthias -- "Programs are poems for computers." |
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Messages In This Thread |
WP34s Differential Time and shift - MarkHaysHarris777 - 02-09-2015, 11:43 PM
RE: WP34s Differential Time and shift - Katie Wasserman - 02-09-2015, 11:51 PM
RE: WP34s Differential Time and shift - MarkHaysHarris777 - 02-10-2015, 06:35 AM
RE: WP34s Differential Time and shift - Katie Wasserman - 02-13-2015, 02:47 AM
RE: WP34s Differential Time and shift - matthiaspaul - 02-10-2015 01:29 AM
RE: WP34s Differential Time and shift - Dave Frederickson - 02-10-2015, 01:44 AM
RE: WP34s Differential Time and shift - matthiaspaul - 02-11-2015, 08:19 PM
RE: WP34s Differential Time and shift - BarryMead - 02-10-2015, 01:58 AM
RE: WP34s Differential Time and shift - Bit - 02-10-2015, 03:27 AM
RE: WP34s Differential Time and shift - matthiaspaul - 02-11-2015, 09:07 PM
RE: WP34s Differential Time and shift - matthiaspaul - 02-13-2015, 01:12 AM
RE: WP34s Differential Time and shift - Steve Simpkin - 02-11-2015, 09:31 PM
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