User manual CITIZEN SRP-280

[. . . ] Holding either key down will make the display become respectively lighter or darker. The display comprises the entry line, the result line, and indicators. Entries begin on the left ; those with more than 11 digits scroll to the left. Press [ 2nd ] [ ] or [ 2nd ] [ ] to move the cursor immediately to the beginning or end of the entry. [. . . ] You can store a real number in variables A, B, C, X, Y, X1, X2 and an expression in PROG. Each calculation is performed in the following order of precedence : 1) 2) Expression inside parentheses. Coordinates transformation, and Type B functions which are required pressing the function key before entering, for example, sin, cos, tan, sin ­1, cos ­1, tan ­1, sinh, cosh, tanh, sinh ­1, cosh ­1, tanh ­1, log, ln, 10 X , e X, ¡Ô , NEG, NOT, X '( ), Y '( ). Type A functions which are required entering values before pressing the function key, for example, X 2, ¥¡ ° ¡§ , !When functions with the same priority are used in series, execution is performed from right to left. e X ln120¡÷ E X { ln (120 ) } otherwise, execution is from left to right. Anything contained within parentheses receives the highest priority. Numbers used as input must be within the range of the given function as follow : E-6 Error massage will appear on the display and further calculation becomes impossible when any of the following conditions occur. An entry for SRP-280 exceeds 84 digits IMP LENGTH (The limit for SRP-285 is 88 digits) after Error implied multiplication with auto-correction. Arithmetic operations are performed by pressing the keys in the same sequence as in the expression. Results greater than 1010 or less than 10 ­ 9 are displayed in exponential form. Decimal places formats are selected by pressing [ 2nd ] [ TAB ] to display the menu. To set decimal places to n ( F0123456789 ), enter a n value directly or press [ ENTER ] key while the item is underlined. Even if the number of decimal places is specified, internal calculation for a mantissa is performed in 14 digits for SRP-285 and 24 digits for SRP280, and the display value is stored in 10 digits. To round off those values to the specified number of decimal places, press [ 2nd ] [ RND ]. Number display formats are selected by pressing [ 2nd ] [ SCI/ENG ] to display the menu. the items on the menu are FLO (for floating point) , SCI ( for scientific) , and ENG (for engineering). Press [ ] or [ ] until the desired formats is underlined, and then press [ ENTER ]. (Note) : The engineering format is similar to the scientific format, except the mantissa can have up to three digits left of the decimal, instead of only one, and the exponent is always a multiple of three. SRP-280 can use up to 14 levels of consecutive parentheses in a single calculation. SRP-285 can use up to 22 consecutive levels of parentheses in a single calculation. Closed parentheses occurring immediately before operation of the [ ENTER ] key may be omitted, no matter how many are required. [. . . ] In VLE mode, you just enter each coefficient ( a, b, c, d, e, f ) in the correct order, and the calculator automatically solves for x, y. Quadratic equations (QE) mode can solve a equations as follows : a x 2 + b x + c = 0, where x is unknown. In QE mode, you just enter each coefficient ( a, b, c ) in the correct order, and the calculator automatically solves for all x values. SRP-285 can use up to 22 consecutive levels of parentheses in a single calculation. [. . . ]