HP48 Clock Variableness

[BillBee]

(02-22-2021 12:50 AM)TomC Wrote:  So, after 1 week (and a few hours), I have measured 6 machines, mostly all Version R (one version L), some 48G+, a 48GX and a 48G.

The ppm error on all is right around 20ppm. It is curious that all were slow. 20ppm seems to be the 'common' variety of crystal that is likely used in 48G.

So, I will either reset these manually, or perhaps write some code that will calculate and store an updated CLKADJ constant.

Thanks all for your feedback and comments,
TomC

Good Morning Tom,

The 41CX had a correction factor for the clock. IIRC the manual had a +/- 3 sec/day for the clock as a possible deviation. Does the 48 series have such?

Take Care,
Bill