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Text File | 1992-05-16 | 22KB | 448 lines

Electrical and Electronic Formulas version 3 Copyright (C) 1990 - 1992 Miller Introduction: This program contains a collection of basic electrical and electronic formulas, found in any electrical engineering handbook. The software includes the most commonly used formulas, and when required, should lessen the need of looking up individual formulas. This software is able to take advantage of a math coprocessor, although this is not a requirement to obtain satisfactory results. Differences: This release contains all the features of previous versions, plus a choice of calculators, either algebraic or Reverse Polish Notation. The Reverse Polish Notation style is more commonly known as a RPN. The electronics section now contains a color code chart. The electrical section now includes junction box sizing, a motor full load current chart, and a wire ampacity chart. All options are now set in configuration area, instead of on the command line, all previous command line support has been removed. Some additional maintenance changes were also implemented in this version. File Index: EEF .EXE : 78641 Bytes, Electrical and Electronic Formula program EEF .DOC : 20021 Bytes, file containing general program information EEFELEC.DBF : 21280 Bytes, file containing the world wide voltage chart EEFHELP.DBF : 12880 Bytes, file containing general help information System Requirements: This software has been successfully tested on systems with 8086, 8088, 80286, and 80386 processors, with and without a coprocessor installed. This software will run successfully, within your system, if it meets the following minimum requirements. A:IBM/XT compatible computer B:DOS version 3.0 or later C:At least 256K free memory D:CGA color monitor E:Floppy or hard disk drive Installation: The program, including support files, is compact enough that it will run satisfactorily on a single floppy disk. A hard drive should be used, if available, this will allow faster access to the data files. To install the software on a hard drive type each of the following lines into the computer, at the DOS prompt. MD FORMULA <ENTER> Make a working directory. COPY A:EEF*.* C:\FORMULA /V <ENTER> Copy files to new directory. CD\FORMULA <ENTER> Change to working directory. EEF <ENTER> Execute the program. A batch file may be created to allow easier loading of the program. This file should be located in the root directory of the hard drive. Type each of the following lines into the computer, at the DOS prompt, to create the batch file. COPY CON C:\EEF.BAT <ENTER> Copy input into file. CD\FORMULA <ENTER> Change to working directory. EEF.EXE <ENTER> Execute the program. ^Z <ENTER> End of input. If the DOS path variable includes the root directory, the user is not required to change directories, before execution. Refer to your DOS manual for instructions on using the path command. Command Line Options: Command line options were removed from this version. See the configuration section on setting up all program options. General Information: Make a selection from the main and sub menus, by pressing the appropriate key. A description of the area you have accessed is explained at the top of the screen. Several prompts will be displayed, these require user input, if any require more than a single character response then a data entry window will be opened. The first characters that have been keyed in will be eliminated if an overflow occurs. The BACKSPACE key may be used to delete any characters that were keyed in incorrectly. Press the ENTER key to complete the process. When all the necessary data has been entered the program will solve for the unknown value, or perform a conversion, depending on which section you are in. The ESC key is always enabled, and may be used in any area. Pressing this key once will return you to the first data entry point on the current screen. This is very useful if you discover an incorrect entry. Pressing the ESC key again will cause the most recent menu to be displayed. Use this method to trace your steps back to the main menu, and to exit from the program. Configuration Options: This section is accessible from the main menu, and allows four items to be set up to suit the user. These options include foreground and background colors, calculator type, and sound generation. The options are displayed, individually, at the bottom of the screen. If a change is necessary, simply key in the appropriate numeric values and press the ENTER key. If no change is required, then press the ENTER key to go on to the next item. All the options are listed below, with the range of acceptable input values. Foreground color : Range 0 - 15 The default is white. Background color : Range 0 - 7 The default is black. Calculator type : Range 0 - 1 The default is algebraic. 0 = Algebraic 1 = RPN (Reverse Polish Notation) Sound : Range 0 - 1 The default is sound on. 0 = On 1 = Off The foreground and background colors cannot be set to the same value. An error message will be displayed if this should occur. Please refer to the information area concerning the calculator, for assistance in making your selection. Use the ESC key to exit this section, upon leaving all changes will be automatically saved in the EEF.DAT file. Electronics Overview: This section is accessible from the main menu, and allows the user access to various fundamental electronic formulas. The total capabilities of this section are detailed below. In addition, there is a standard electronics color code chart. A:Ohms law (DC) H:Impedance B:Ohms law (AC) I:Reactance C:Resistance total J:Resonance D:Capacitance total K:Admittance E:Inductance total L:Susceptance F:Mutual inductance M:Conductance G:Coupled inductance Most areas will compute several different derivatives of a formula. For instance, the resonance area can solve not only for resonance, but also capacitance, or inductance. In areas where this is possible, you will be given several choices. Then by user selection, the formula for the specified quantity will be performed. The formula used is displayed on the screen at the end of all computations, with a time and date stamp. The standard print screen function may be utilized in obtaining a print out. The conventional method of declaring component values may be used. Impedance, reactance, and resistance may be input using the standard K and M notation, representing kilohm and megohm respectively. The default unit of measure for these values is the ohm. Capacitance may be input using the standard M and P notation, representing microfarad and picofarad respectively. The default unit of measure for capacitance is the farad. Inductance may be input using the standard M notation, representing millihenry. The default unit of measure for inductance is the henry. Frequency may be input using the standard K and M notation, representing kilohertz and megahertz respectively. The default unit of measure for frequency is the hertz. Power may be input using the standard K and M notation, representing kilowatt and megawatt respectively. The default unit of measure for power is the watt. Electrical Overview: This section is accessible from the main menu, and allows the user access to various fundamental electrical formulas. All available functions are exhibited below, in addition to this, there is a motor full load current and wire ampacity chart. A:Efficiency H:Fuse sizing B:Power factor I:Wire sizing C:Amperes from horsepower J:Conduit sizing D:Amperes from kilowatts K:Junction box sizing E:Amperes from kva L:Wire resistance F:Kilowatts M:Voltage drop G:Kilovolt-amperes N:KVAR capacitor sizing O:Supply system conversion The left column represents formulas that may be used for calculating both single and three phase circuits. The other formulas are not phase dependant and may be used for any circuit configuration. Efficiency and Power Factor are calculated and displayed on the screen as a percent value. When entering data at an efficiency or power factor prompt, the input must be made as a percent value. The supply system area calculates the current draw, by a load, on any conventional power system. This is convenient for 60hz to 50hz conversions. The formula used to arrive at the result is displayed on the screen at the end of most calculations. The standard print screen function may be utilized in obtaining a print out. Number Systems: This section is accessible from the main menu and allows the user access to a numeric evaluation area. This section will evaluate, and convert a numeric value to an equivalent value in another system. A box is used to indicate the current system type. Use the space bar to toggle between the displayed number systems. Once you have entered the data to be converted, simply press the ENTER key, and the equivalent values will be displayed for all systems simultaneously. When entering a binary value you can use the left and right arrow keys to assist in locating the cursor to a particular bit position. The BACKSPACE key is used to reset the individual bits to zero. Pressing the 1 or 0 key sets the bits, then automatically moves the cursor to the next lower bit position. The upper and lower limits for any conversion is detailed below. Decimal (base 10) : +/-1048575 Binary (base 02) : 1111 1111 1111 1111 1111 Octal (base 08) : 3777777 Hex (base 16) : FFFFF If a value outside of these limits is entered, or calculated, an error message will be displayed on the monitor screen. World Wide Voltage: This section is accessible from the main menu, and allows the user access to a unique information area. Data is provided on the electric power supplied to consumers in various countries. The list covers a wide range of topics that include frequency, system type (wye/delta), single phase voltage, and three phase voltage, when available. All of the voltages listed are of the alternating current type. Perhaps a brief explanation of wye and delta system will be of some benefit here. A wye or star system has a high voltage that is 1.732 times the low voltage, a good example of this is in the 120/208 wye configuration. The delta system however, has a high voltage that is 2 times the low voltage, as in the 120/240 delta configuration. This is typical of all power systems, regardless of type, or location. A single voltage listed under the single phase column indicates that the consumer has only the one voltage available. The service will consist of two wires, one phase wire and one neutral wire. For some countries two voltages are listed under this column, indicating that a three wire service is provided, two phase wires and one neutral wire. A three phase service, when available, will normally be furnished with four wires, three phase wires and one neutral wire. The high voltage listed may be either single or three phase, but the low voltage will always be single phase. Helpful Information: This section is accessible from the main menu, and provides the user with a quick on-line reference guide. The information contained in this section is principally the same as what is found in this file. On-screen Calculator: This tool is accessible from anywhere in the program, entry is gained by simply pressing the F1 key. A list of special features is always displayed with the calculator, for quick reference. It's total capabilities, include the four basic functions, squaring, square root, reciprocal, and exponential math. An additional enhancement is the ability to export the current value in the display back to the main program, for further use. There are two types of calculators available, an algebraic, and a RPN style, commonly known as Reverse Polish Notation. The major differences between the two styles is the way in which the data is entered. Standard algebraic notation places the operators between the numeric data, but Reverse Polish Notation places the operators after the numeric data. Some sample comparisons are detailed below. Problem (2 + 5 - 3 = ?): Algebraic RPN Keystroke Display Keystroke Display 2 2 + 2.000... <ENTER> 2.000... 5 5 - 7.000... + 7.000... 3 3 = 4.000... - 4.000... Problem (12 * 10 / 5 = ?): Algebraic RPN Keystroke Display Keystroke Display 12 12 * 12.000... <ENTER> 12.000... 10 10 / 120.000... * 120.000... 5 5 = 24.000... / 24.000... Problem (20 - 10 + 30 / 5 = ?): Algebraic RPN Keystroke Display Keystroke Display 20 20 - 20.000... <ENTER> 20.000... 10 10 + 10.000... - 10.000... 30 30 / 40.000... + 40.000... 5 5 = 8.000... / 8.000... The function keys provide the calculator with some important extended functions, these include the following. F(1) - Clear the display Pressing this key once clears the numeric entry in progress, pressing the key again will clear the entire calculator. F(2) - Change sign Pressing this key toggles the display from positive to negative. F(3) - Export result Pressing this key will take the value in the display and place it in the data window of the main program. This function will export back to the electrical and electronic sections, if a window is displayed. The function is also allowed in the number system conversion area, if the decimal system is currently selected. F(4) - Pi Pressing this key will place the constant Pi in the display. F(5) - Square Pressing this key will square the number in the display. F(6) - Reciprocal Pressing this key will give the reciprocal of the number in the display. F(7) - Square root Pressing this key will give the square root of the number in the display. F(8) - Exponential math Pressing this key will give the exponential result of the last numeric values keyed in to the calculator. An example follows. Algebraic RPN Keystroke Display Keystroke Display 2 2 + 2.000... <ENTER> 2.000... 3 3 F(8) 8.000... F(8) 8.000... When using the algebraic mode, one of the following keys must be used to load the initial value, these include + - * / =. Also, the ENTER key may be substituted for the EQUAL key, at any time. All functions can be chained together, excepting exponential math, this feature requires both allocated storage areas. Select the calculator you are most comfortable with in the configuration section, accessible from the main menu. Disclaimer: The author accepts no responsibility for the application of this software, the result obtained, any errors or omissions contained herein. This material is subject to change without notice. Comments: The author welcomes all comments and inquiries, input from users is very important to future releases of this software. You may contact me via E-mail on the listed services, or at the address below. Compuserve (73407,546) Prodigy (MHDW64A) Registration: This program is copyrighted, and is offered as shareware software. If you find this software useful, and plan to retain and use it, then please register the program. Your registration entitles you to a copy of the latest version of this software and notification of future updates. Please send this form, with $20.00, to the author at the address below. Name:___________________________________________________________ Address:________________________________________________________ City, State:____________________________________________________ Zip Code:_______________________________________________________ Country:________________________________________________________ Version You Are Using:________________Media Type________________ (5.25 / 3.50 Diskette) Gregory J. Miller 2303 Bennington Place Maryland Heights, Mo. 63043 ----------------end-of-author's-documentation--------------- Software Library Information: This disk copy provided as a service of Public (software) Library We are not the authors of this program, nor are we associated with the author in any way other than as a distributor of the program in accordance with the author's terms of distribution. 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