+- HP Forums (https://archived.hpcalc.org/museumforum)
+-- Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum-1.html)
+--- Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum-2.html)
+--- Thread: Current Consumption and Program Performance HP15CLE (/thread-197051.html)
Current Consumption and Program Performance HP15CLE - Thomas Chrapkiewicz - 09-21-2011
Test Units:
15CHHC2010 CNA02130778, Code:2009-08-03
15CLE CNA1310KH3/02290, Code:2011-04-15
External 3V power supply, CR2032 Cells.
Fluke 8060 Multimeter
------------------------------------------
I have verified that both the HP15CLE and the HP15C2010HHC draw about 20mA when any key is pressed. I tested this with both an external power supply and an externally applied CR2032 cell. They both draw about 20mA when a program (the LBL A + GTO A loop) is running.
Also, when the ON key is pressed to turn the calc off and held, it continues to draw 20mA until released.
Program execution time Performance:
The 15CLE is about 20% faster than the 15C2010HHC unit (also running the LBL A + GTO A loop). I wonder if this is due to code differences or manufacturing/component tolerances.
TomC
Re: Current Consumption and Program Performance HP15CLE - Mike Morrow - 09-21-2011
It would be interesting to see the results of the Savage Benchmark for your examples. See message 68 in this thread for a listing for the 15C-LE and instructions.
My 15C-LE does the standard 2500 iteration test in about 48 seconds. The original 15C takes 5840 seconds.
Re: Current Consumption and Program Performance HP15CLE - Thomas Chrapkiewicz - 09-21-2011
I'll look into that.
Further tests have shown a great variance in timing tests. I have not yet determined which machine (or machine) is varying, but the difference now is closer to 1%.
TomC
Re: Current Consumption and Program Performance HP15CLE - Thomas Chrapkiewicz - 09-21-2011
Both my 15CLE and 15CHHC2010 complete the Savage Benchmark in 50 seconds with 2499.969898.
TomC
Re: Current Consumption and Program Performance HP15CLE - DaveJ - 09-21-2011
If I designed a battery powered product that worked like that, I would have got the arse!
And I'll say it again, the HP design team were well aware of the issue 2 years ago, so no excuse.
Thankfully it could be fixed with a firmware upgrade.
Dave.
Edited: 21 Sept 2011, 9:41 p.m.