Thursday, January 14, 2016

HP 15C: Reactance Chart Solver



HP 15C: Reactance Chart Solver

Source:  HP-65 E.E. PAC 1.  Hewlett Packard.  September 1974.  pg. 8-9

Equation:

2 * π * f * √(L*C) = 1

Variables:

R0 = f = Resonant Frequency (Hz)
R1 = L = inductance (henrys)
R2 = C = capacitance (farads)

Instructions:

Enter the known values in each of the variables.  Enter the number of the variable to be solved in register I ( [ STO ] [ TAN ] (I) ).  To solve, enter a range, and press [ f ] [ ÷ ] (SOLVE), [ y^x ] (D). (*or whatever label you assigned this program to)

Program:

Step
Key
Key Code
001
LBL D
42, 21, 14
002
STO (i)
44, 24
003
2
2
004
π
43, 26
005
*
20
006
RCL* 0
45, 20, 0
007
RCL 1
45, 1
008
RCL* 2
45, 20, 2
009
11
010
*
20
011
1
1
012
-
30
013
RTN
43, 32

Example:

L = R1 = 2.5 H, f = R0 = 60 Hz.  Calculate C (R2).  Store 2 in RI.

Result:  R ≈ 2.8145 E-06  (use range 0 to 1)

This blog is property of Edward Shore. 2016

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