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public:calculator:info:dm41x_info [23/01/26 14:04 GMT] – [RTC Error] johnpublic:calculator:info:dm41x_info [01/02/26 08:36 GMT] (current) – [Update January 2026] john
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 </code> </code>
  
-==== update 28/5/22 ====+==== Update 28/5/22 ====
 After a period of observation the rate is now over-corrected. Try reducing correction to ''-37.5'' which corresponds to a ppm error of ''35.76ppm'', or ''3.26 s/d''. After a period of observation the rate is now over-corrected. Try reducing correction to ''-37.5'' which corresponds to a ppm error of ''35.76ppm'', or ''3.26 s/d''.
  
  
-==== RTC Error ==== 
  
-^Start^Stop^Accumulated Error (s)^Rate Error (s/d)^Comments^+^Date Start^Date Check^Accumulated Error (s)^Rate Error (s/d)^Comments^
 |28/3/22 |24/5/22 | |-0.1 |correction applied (C=40). Uncorrected error +3.5| |28/3/22 |24/5/22 | |-0.1 |correction applied (C=40). Uncorrected error +3.5|
 |24/5/22| | |  |new correction C=-42.47 | |24/5/22| | |  |new correction C=-42.47 |
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 |28/5/22|  | |-0.3|still over-corrected. New factor: -37.5. DM41X reports this is a correction of -35.3ppm | |28/5/22|  | |-0.3|still over-corrected. New factor: -37.5. DM41X reports this is a correction of -35.3ppm |
 |28/5/22|31/5/22 |  |+0.2 | Now under-corrected? Difference across 3 days is only 0.5 seconds, so perhaps needs longer to reduce reaction-time-error| |28/5/22|31/5/22 |  |+0.2 | Now under-corrected? Difference across 3 days is only 0.5 seconds, so perhaps needs longer to reduce reaction-time-error|
-|28/5/22 |28/6/22 |  | +0.1 | Almost 1 month later. Delta 31/5/22 = -15.7s, Delta 28/6/22 = -11.6s. +4.1s in 28 days  | +|28/5/22 |28/6/22 |  | +0.1 |Almost 1 month later. Delta 31/5/22 = -15.7s, Delta 28/6/22 = -11.6s. +4.1s in 28 days  | 
-|28/5/22| 8/7/22|  | +0.1 |  Delta -10.1s |+|28/5/22| 8/7/22|  | +0.1 |Delta -10.1s |
 |28/5/22 | 21/9/22 | | + 0.2 | Delta +1.2s. Still slightly under-corrected but good enough  | |28/5/22 | 21/9/22 | | + 0.2 | Delta +1.2s. Still slightly under-corrected but good enough  |
 |28/5/22 | 15/4/23| -7.6 | +0.0 | Delta -7.6s in 322 days = 0.02 s/d | |28/5/22 | 15/4/23| -7.6 | +0.0 | Delta -7.6s in 322 days = 0.02 s/d |
-|15/04/23 | 22/11/23 | +33.3   | +0.2   |  | +|15/04/23 | 22/11/23 | +33.3   | +0.2   | 33.3s in 221 days = 0.15 s/d | 
-|23/01/26 |  |+2.7|  | Start new period of monitoring - last reset date unknown |+ 
 +==== Update January 2026 ==== 
 + 
 +Using my [[..:..:miscellany:watches:watchcheck|python Watchcheck]] 
 + 
 +^Date Start^Date Check^Delta^Latest Rate Error^Average Rate Error^Comments^ 
 +|23/01/26 |  | +2.7 |  | | New Period: correction-35.3ppm | 
 +|23/01/26| 24/01/26 | +2.6 | -0.1 | -0.1 | After 24 hours | 
 +|23/01/26| 26/01/26 | +3.0 | +0.2 | +0.1 | After 3 days | 
 +|23/01/26| 27/01/26 | +3.2 | +0.3 | +0.1 | After 4 days |
  
  
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 ==== Complex Numbers ==== ==== Complex Numbers ====
 +
 +For more about the ''41Z'' see the separate page [[..:guides:41z_module|]]
 +
  
 I'm using the ''41Z complex number'' module by Angel Martin to add a 4-level complex number stack. It's a bit confusing at first to get to grips with, but adds a lot of functionality to the the DM41x. I'm using the ''41Z complex number'' module by Angel Martin to add a 4-level complex number stack. It's a bit confusing at first to get to grips with, but adds a lot of functionality to the the DM41x.
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   * Firmware      : [[https://technical.swissmicros.com/dm41x/firmware/]]   * Firmware      : [[https://technical.swissmicros.com/dm41x/firmware/]]
-  * Documentation : [[https://technical.swissmicros.com/dm41x/doc/dm41x_user_manual.html|User Manual]]+  * Documentation : [[https://technical.swissmicros.com/dm41x/doc/dm41x_user_manual.html|Online User Manual]] 
 +  * Documentation : {{ :public:calculator:info:dm41x_user_manual.pdf | PDF Manual}}
   * Product Page  : [[https://www.swissmicros.com/product/dm41x|DM41X]]   * Product Page  : [[https://www.swissmicros.com/product/dm41x|DM41X]]
  
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   * See [[public:calculator:progs:dm41x_progs|]]   * See [[public:calculator:progs:dm41x_progs|]]
  
 +
 +===== HP-41CX Owner's Manuals =====
 +
 +Download from [[https://literature.hpcalc.org]]
 +
 +  * HP-41CX Owner's Manual Vol. 1 : [[https://literature.hpcalc.org/community/hp41cx-om-vol1-en.pdf]]
 +  * HP-41CX Owner's Manual Vol. 2 : [[https://literature.hpcalc.org/community/hp41cx-om-vol2-en.pdf]]
 +  * HP-41CX Quick Reference Guide : [[https://literature.hpcalc.org/community/hp41cx-qrg-en.pdf]]
  
  

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