(HP-65) Electromagnetic Shielding Materials & Performance

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An excerpt from a Handbook on Electromagnetic Shielding Materials & Performance 2e, Donald R. J. White, MSEE/PE, pages 93-102 (3.01 thru 3.10}, © 1980

                                          CHAPTER 3
                             APPLICATIONS AND EXAMPLES
     This chapter discusses how to use the shielding design graphs in
this handbook with particular emphasis on the graphs presented in the
appendices. A number of illustrative examples is given to familiarize
the reader with the design graphs and to exercise the variables involved.
Finally, the last section in this chapter presents a Hewlett-
Packard HP-65 programmable calculator program for those who wish to
compute the shielding effectiveness of any metal for any applicable input
data. …
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3.1 HOW TO USE THE DESIGN GRAPHS
…
3.2 ILLUSTRATIVE EXAMPLES
     This section presents a number of examples which serve to illus-
trate how the design graphs in the appendices can be used. …
…
3.3 HP-65 PROGRAM FOR SHIELDING EFFECTIVENESS
     Most of the graphs presented in this handbook were developed by
programming pertinent mathematical models on the Hewlett-Packard Model
HP-65 programmable calculator. This calculator uses a magnetic card
to transfer up to 100 steps of stored program. The HP-65 contains
four working registers (the stack) and nine storage registers. It was
selected since it has adequate capacity to run off many of the shielding
relations and it is readily available in USA at a cost of about
$700 as of 1975.
     Specifically, the shielding effectiveness relation presented in
Eq. (1.64) is the main program. The supporting relations used in the
program are given in Eqs. (1.68), (1.71), (1.74) and (1.77). It took
quite a bit of program manipulation to get all the relations into a 100-
step program to meet the limitations of the HP-65. This program is
presented in Table 3.4. Thus, those having access to the HP-65 need
merely to key in the 100-step program of Tab. 3.4 and transfer memory
to a permanent magnetic card.

3.3.1 USER PROGRAM INSTRUCTIONS
     The User Program Instructions are listed below. From the magnetic
card developed from Tab, 3.4, load the HP-65 with this Shielding Effectiveness
Program #1513, Next, key in the pertinent input data and store in
registers …
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          Table 3.4 - HP-65 Shielding Effectiveness Program Steps
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3.3.2 ILLUSTRATIVE EXAMPLES
     The following examples will serve to illustrate the use of the
HP-65 shielding effectiveness program. The results may be compared
with those in the appendices* or in Sec. 3.2.
…

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