HP48g function



#2

I am trying to figure out how to use my HP 48G to solve simultaneous equations using vectors for an electrical circuits. So far I am drawing a blank. It seems that all the schools are set up to use TIs' and no one knows the HPs'. Can anyone tell me how to use my HP to perform mesh analysis for AC circuits. I would be most greatful. Thank you.


#3

I guess you calculate currents and voltages in complex notation by using (complex) amplitudes and impedances. The 48 can calculate with matrices in order to solve sets of linear equations (see the math menu and the manual on matrix calculations). I am not sure however if the 48 can handle complex matrices as well.

#4

Mark --

You're in luck! In collecge 15 years ago, I not only solved AC and DC loop circuits using matrix functions on my HP-15C, but also now have a 48G at which I am reasonably competent.

After setting up the exactly-determined system-coefficient matrix and the system-measurement vector (both real-valued for DC systems; both complex-valued for AC systems):

  1. Choose "SOLVE" (above "7" key) with the green right-shift key
  2. Select "Solve lin systems"
  3. Enter the (square) matrix as A. Use brackets to enclose each row vector, with spaces between each coefficient; enclose all vectors within another set of brackets to make it a matrix. Enclose complex-valued numbers inside parentheses, with a comma between parts. Use the angle symbol if needed (green right-shift, "SPC"). Load the values with "ENTER".
  4. Enter the measurement-vector values as B, inside one set of brackets. (The same guidance applies for complex-valued numbers.) Load the values with "ENTER".
  5. Press the "SOLVE" soft-menu key ("F").
  6. The answers will be in X. Use "EDIT" (softmenu key "A") to see the full values.

I used this procedure successfully to solve two examples in the HP-15C manual.

BTW, this question could also have been posed in the Usenet group comp.sys.hp48, but it's not inappropriate here.

Regards,

-- KS


Possibly Related Threads...
Thread Author Replies Views Last Post
  HP50g: Writing a function that returns a function Chris de Castro 2 448 12-10-2013, 06:49 PM
Last Post: Han
  HP48G Series Connectivity in a USB World Les Wright 3 332 05-06-2012, 01:29 AM
Last Post: Reth
  HP48G purchase from "that list site" Ethan Conner 2 284 08-27-2011, 07:31 PM
Last Post: Ethan Conner
  HP 50g - Make menus more like HP48g Brian K 1 228 07-18-2011, 02:43 PM
Last Post: Brian K
  Backing up several HP48G/G+/GX via HP50 Thomas Chrapkiewicz 4 398 02-14-2011, 11:39 AM
Last Post: Tim Wessman
  Hp48G top plastic cover bent? Luis Moreno 3 271 05-26-2010, 04:42 PM
Last Post: Bart (UK)
  HP48G ROM transplanted in a HP38G Thomas Chrapkiewicz 0 154 08-11-2009, 12:49 PM
Last Post: Thomas Chrapkiewicz
  HP48G Problem Jno. Greenslet 7 445 06-17-2009, 08:31 PM
Last Post: Jno. Greenslet
  Troubles connencting Conn4x <--> HP48G Matti Övermark 6 434 05-29-2009, 04:30 AM
Last Post: Matti Övermark
  SysRPL question (HP48G-series) Matti Övermark 1 216 07-24-2008, 11:16 AM
Last Post: Matti Övermark

Forum Jump: