SwissMicros Calculator Forum

Hi Thomas and Thomas, Thank you so much for the excellent explanation, that makes perfect sense. I love both machines, what a great combo, one high fidelity, the other high optimization/precision. They make great addition to my HP collection, I am just thankful for SwissMicros and all the developers...

I did some searches on the forum but I could not find any reference to the accuracy of DM42 vs. DM41X. I am aware of the precision in the DM42, and the SHOW function allows me to see the glory of all the digits. But I have not been able to come across anything similar in the DM41X, can anyone shed s...

Got my 42 a couple months ago, and the 41X just arrived today. First impression is it is slightly easier to press, and with a more audible click. However, I feel the 42 is actually closer to the 41CX when it comes to the keyboard because it is almost silent. I think if you have a late built 42, the ...

After over a month, I have to declare that once you dial in the proper correction value, the clock is highly accurate and consistent. After 34 days, the delta is under 1 sec. Which represents an accuracy better than 0.34 ppm.

I have been tweaking with the correction factor and finally settled on a correction factor C=-22. After daily checking for a week, there is no detectable drift from the reference clock in my lab. I will keep it running for another month and see what happens. But so far, it appears that despite the c...

Very interesting, as the TI59 was my primary calculator in college as well.

Have you consider running the test against both the Prime and Prime G2?

Some discoveries to share: • bobhwasatch is absolutely right. Sign-wise for the compensation variable C, a -ve value slows down the clock, and vice versa. • Starting from C=-14 (from the crystal frequency deviation measurement), after a couple tries, I found a value of C=-16 gives my calculator almo...

Hi Werner, No, it does not seem to work. The instruction is very vague, I am reversing the sign and will check in a couple days, I am currently gaining around 2 seconds after 24 hours. The following from the manual: "Note that to apply RTC correction you have to know (measure and calculate) ppm...

Good catch, Werner. I meant C=+14 I set the time with my lab master reference clock, that clock is accurate to <1 ps error. Unfortunately, I had to set it by hand as I don’t know a way to do a programmatic sync. My guess is RTC correction value is intended to compensate crystal error to 0.5 ppm - un...

Just perform a measurement on the crystal on board the DM42, the spec frequency is 32.768 kHz. I tested its output on my counter, the crystal is stable to the 1Hz, but digit below the decimal point is not stable. I had the counter collect 100 samples at full resolution, the average is 32,767.548954 ...