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Text File | 1993-03-01 | 18.4 KB | 364 lines

Electrical and Electronic Formulas version 3 Copyright (C) 1990 - 1992 Miller Introduction: This program contains a collection of basic electrical and electronic formulas, which can be found in any electrical engineering handbook. The software was developed, in an effort, to alleviate the necessity of looking up individual formulas each time they are needed. This software includes the most commonly used electrical and electronic formulas. The software was complied to include the use of a math coprocessor, if one is present. The coprocessor will be emulated if one is not found in your system. Differences: This release contains all the features of version 1 and 2, plus a a choice of calculators, either algebraic or RPN (Reverse Polish Notation). A color code chart was added to the electronics section, and junction box sizing, a motor full load current chart, and a wire ampacity chart was added to the electrical section. Also the command line options were removed, options are now set in the configure area and stored in a data file. Some additional minor maintenance changes were also put into effect in this version. File Index: EEF .EXE : 81760 Bytes, Electrical and Electronic Formula program EEF .DOC : 18873 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: The software minimum requirements are as follows... Any XT compatible computer DOS version 3.0 or later 256K memory A CGA color monitor A floppy or hard disk drive Installation: The program, including support files, is compact enough that it will run satisfactorily on a floppy disk. If a hard disk is available it should be used, this will allow faster access to the data files as they are needed. Type each of the following lines into the computer, at the DOS prompt, to install on a hard disk system. MD FORMULA <ENTER> Make a directory COPY A:EEF*.* C:\FORMULA /V <ENTER> Copy files to new directory CD\FORMULA <ENTER> Change to new directory EEF <ENTER> Execute the program A batch file can 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 a batch file. COPY CON C:\EEF.BAT <ENTER> CD\FORMULA <ENTER> EEF.EXE <ENTER> ^Z <ENTER> To execute the program, change to the root or formula directory, and type EEF, followed by the <ENTER> key. If the DOS path is set to include the root and formula directories, changing to a particular directory will become unnecessary. 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 configure section on setting up the program options. General Information: Select the proper subject from the main menu. Once the new menu is displayed you will have to select an appropriate topic. The program will then display this screen. The first few lines, starting at the top of the monitor will give a brief description of the area you have accessed. If a prompt will require more than a one character response, then a window will be displayed. The window has a wrap feature, which works as follows; as the window becomes filled, characters on the left will be dropped, as new characters are added on the right side of the window. The <BACKSPACE> key can be used to eliminate characters, from the right side of the window, one at a time. When you are sure that you have entered the data properly, press the <ENTER> key, this will allow the program to read and store the data. When all the necessary data has been entered the program will solve for the unknown value, or perform a conversion, and display the result. The <ESC> key is always enabled, and can be used in any area. Pressing the <ESC> once will return you to the first data entry point on the current screen, this is useful if you made an incorrect entry. Pressing the <ESC> key again will cause the most recent menu to be displayed. Use this method to find your way back to the main menu, and also to exit the program. Configuration Options: This section is accessible from the main menu by pressing the <A> key. There are four items that can be set up to suit the user, this setup data is then stored, for future reference, in a 8 byte file named EEF.DAT. The setup options include foreground and background colors, calculator type, and sound generation. The options are displayed on the lower area of the screen, one at a time. If a change is necessary simply key in the appropriate numeric values and press the <ENTER> key. If no change is to be made then simply press the <ENTER> key to go to the next choice. The options are listed below. Foreground color : Range 0 - 15 Background color : Range 0 - 7 Calculator type : Range 0 - Algebraic / 1- RPN (Reverse Polish Notation) Sound : Range 0 - On / 1 - Off The foreground and background colors can not be set to the same value, an error message will be displayed if this occurs. See the on-screen calculator information area for operational considerations, concerning the type selection. To save the changes press the <ESC> key, this will exit the configure area and write the setup information to the setup file. Electronics Overview: This section is accessible from the main menu by pressing the <B> key. This section of the program will calculate various electronic related formulas as listed below. Also included is a electronics color code chart. Ohms law (DC) Coupled inductance Ohms law (AC) Impedance Resistance total Resonance Capacitance total Admittance Inductance total Susceptance Mutual inductance Conductance Most sections will calculate several different derivatives of a formula, for instance, the resonance area has the capability of solving not only for resonance, but also capacitance, or inductance in a resonant circuit. In the 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 to arrive at the result is displayed on the screen at the end of any calculation. The standard print screen function can be used to obtain a hard copy, the screen is also time and date stamped, as a further aid to the user. Electrical Overview: This section is accessible from the main menu by pressing the <C> key. This section of the program will calculate various electrical related formulas as listed below. Efficiency Fuse and wire size Power factor Conduit and junction box size Amperes from horsepower Wire resistance and voltage drop Amperes from kilowatts Kvar capacitor sizing Amperes from kva Supply system conversion Kilowatts and KVA Also a FLC and wire ampacity chart The left column represents formulas that can be used for calculating both single and three phase circuits. The other formulas are not phase dependant and can be used for any circuit configuration. Efficiency and Power Factor are calculated and displayed on the screen as a percent. Also, when entering data at an Efficiency or Power Factor prompt, the data must be input as a percent. 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 can be used to obtain a hard copy, the screen is time stamped, as a further aid to the user. Number Systems: This section is accessible from the main menu by pressing the <D> key. This section of the program will evaluate, and change a quantity in one number system 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 can be used to reset the individual bits to zero. Pressing a <1> or <0> key will automatically move the cursor to the next lower bit position. The current lower and upper conversion limit is: Decimal (base 10) : +/-1048575 Binary (base 02) : 1111 1111 1111 1111 1111 Octal (base 08) : 3777777 Hex (base 16) : FFFFF If a value outside 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 by pressing the <E> key. This section of the program provides a current list of the worlds electric power supplied to consumers. The list covers a wide range of countries, and includes frequency, system (wye/delta), single phase voltage, and three phase voltage, when available. All voltages listed are alternating current (AC). A wye or star system will have a high voltage that is 1.732 times the low voltage, for example 120/208. A delta system will have a high voltage that is 2 times the low voltage. If a single voltage is listed under the single phase column, then it can be assumed that the consumer has only the one voltage available, and that it is a two wire service, (one phase wire and one neutral). Two voltages listed under the same column would indicate that the consumer has a three wire service, and both are available, (two phase wires and one neutral). A three phase service, when available, will normally be furnished with four wires, (three phase wires and one neutral). The higher voltage listed can be either single or three phase, but the lower voltage will always be single phase. Helpful Information: This section is accessible from the main menu by pressing the <F> key. Basically this section of the program is a quick reference guide, the information contained in this section is essentially the same as what is found in this documentation file. On-screen Calculator: This feature is accessible from anywhere in the program by pressing the <F1> key. A short list of special functions will be displayed, along with the calculator itself. The capabilities include the normal four basic functions, plus squaring, square root, reciprocal, and exponential math. The current value in the display can also be exported back to the main program. There are two types of calculators available, an algebraic, and an RPN (Reverse Polish Notation) style. The main difference between the two is the way in which the data is entered, algebraic notation places the operators between the numeric data, and Reverse Polish Notation places the operators after the numeric data. Some sample comparisons are shown 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 extended functions as noted above 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, and also to the number system conversion area if the decimal system is the base system. 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 is shown below. 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 any of the basic function keys (+ - * /), or the (=) key, can be used to enter the initial value for exponential math. Also relating to the algebraic mode, the <ENTER> key can be substituted for the <=> key. All functions can be chained together except for the exponential math function. Select the calculator you are most comfortable with in the configure section, which is 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, either good or bad, input from users is very important to future releases of this software. Please feel free to contact me on Compuserve (73407,546), or at the address below. 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. By doing so, you will receive a copy of the latest version of this software and also be assured of being informed of future updates. Please send the form below, along with $20.00, to the address shown. 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