(HP-65) Electromagnetic Shielding Materials & Performance
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07-18-2024, 12:01 AM
(This post was last modified: 07-18-2024 12:03 AM by SlideRule.)
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(HP-65) Electromagnetic Shielding Materials & Performance
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. … … 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 … … Table 3.4 - HP-65 Shielding Effectiveness Program Steps … 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. … BEST! SlideRule |
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