HP Forum Archive 14

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HP-49g units simplifications Message #1 Posted by Michel Beaulieu on 20 Dec 2004, 8:23 p.m. Hi! I have recently tried to manage units on my HP-49g. I certainly don't do the right thing because when i make, for exemple, a multiplication involving units like 3Kg * 5m/ss i don't get 15 N (netons). Or, worst, if i divise 10 m/s by 2 m i don't get 5 m but 5 m/ms. I even get units ansers like Km/m, MPc/pc ; What a i doing wrong? The manual talks about an advanced manual that can be found on HP but i can't locate the PDFl where is tha manual? Thanks Michel

Re: HP-49g units simplifications Message #2 Posted by Veli-Pekka Nousiainen on 21 Dec 2004, 2:27 a.m., in response to message #1 by Michel Beaulieu automatic simplification is done here: 10_m/s 2_m / => 5_1/s These need CONVERT: 15_kg*m/s^2 1_N CONVERT => 15_N VPN

Re: HP-49g units simplifications Message #3 Posted by Norris on 21 Dec 2004, 12:30 p.m., in response to message #2 by Veli-Pekka Nousiainen These need CONVERT: 15_kg*m/s^2 1_N CONVERT => 15_N ******** You may find it more convenient to convert units by simply adding zero of the desired units. This is easier than typing in the CONVERT command, or switching menus to find the CONV button. Example: 15_kg*m/s^2 0_N + Result: 15_N This works on the 48G; I assume that it works on the 49G as well

Re: HP-49g units simplifications Message #4 Posted by Ron Ross on 21 Dec 2004, 12:56 p.m., in response to message #3 by Norris While this works (and I used it often, BEFORE I learned: use left shift button push then push the soft key units you wish to convert to. If the desired units are not compatable you will get a zero unit addition to the stack w/o modifying your original entry. using previous example: 15 Kg*m/s^2 (on the stack) <- (left shift key) press the units ie N under the force menu and Voila 15 N .

Re: HP-49g units simplifications Message #5 Posted by Veli-Pekka Nousiainen on 21 Dec 2004, 1:27 p.m., in response to message #4 by Ron Ross In programs I would still use CONVERT [VPN]

Re: HP-49g units simplifications Message #6 Posted by Francesc Casanellas on 21 Dec 2004, 4:15 p.m., in response to message #1 by Michel Beaulieu I recommend you to get the HP48 "Advanced User Reference Manual" (HP part no. 00048-90136) which is (or was) available in printed form from HP calculators suppliers - 99% usefull for the HP49G. You can download it form http://www.hpcalc.org/hp48/docs/misc/ You cannot get more than 10% of the HP49 without this manual. The HP49+ has a very complete manual ... but only in PFD format. You have to print 860 pages. More on it is also usefull for the HP49G so you can download it too, either from www.hp.com (handheld devices/calculators/calculator support/... or from http://www.hpcalc.org/hp49/docs/misc/ Edited: 21 Dec 2004, 4:44 p.m.

Re: HP-49g units simplifications Message #7 Posted by Veli-Pekka Nousiainen on 21 Dec 2004, 4:44 p.m., in response to message #6 by Francesc Casanellas You don't have to print 860 pages. Just print those that you on the long run find really useful (as printed). [VPN]

Re: HP-49g units simplifications Message #8 Posted by Tom Sherman on 21 Dec 2004, 6:44 p.m., in response to message #6 by Francesc Casanellas Another excellent source is Chris Coffin, An Easy Course in Programming the HP 48G/GX, still available for $19.99 (e.g. Samson Cables). For units, see pages 68-73. And for many topics, LaTorre, Kreider, and Proctor, HP-48G/GX, Investigations in Mathematics, is very helpful. Some have been sold on eBay for $0.99 plus $5.00 postage. I am assuming that most of what pertains to the 48G also works for the 49G. Tom

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