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Contents General Guide.............................................................................................2 Turning on or off .......................................................................................2 Battery replacement .................................................................................2 Auto power-off function.............................................................................2 Reset operation ..............................................
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General Guide Turning on or off To turn the calculator on, press [ ON/C ] ; To turn the calculator off, press [ 2nd ] [ OFF ]. Battery replacement The calculator is powered by two alkaline batteries (G13 or LR44). When the display dims, replace the batteries. Be careful not to be injured when you replace the battery. 1. Unscrew the screws on the back of the calculator. 2. Insert a flat bladed screwdriver into the slot between the upper and lower case then carefully twist it to sepa
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Display readout The display comprises two lines and indicators. The upper line is a dot display up to 128 characters. The lower line is capable of displaying a result of up to 12 digits, as well as 2-digits positive or negative exponent. When formulas are input and executed the calculation by [=], they are displayed on the upper line, and then results are shown on the lower line. The following indictors appear on the display to indicate you the current status of the calculator. Indic
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1 MAIN : Use this mode for basic calculations, including scientific calculations and Base–n calculations. 2 STAT : Use this mode to perform single–variable and paired–variable statistical calculations and regression calculations. 3 CPLX : Use this mode to perform complex number calculation. 4 RESET : Use this mode to perform reset operation. 5 ENG : Use this mode to allow engineering calculations utilizing engineering symbol. Give " 2 STAT " as an example : Method 1 : Press [ MO
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Replay function This function stores operations that just have been executed. After execution is completed, pressing [ ] or [ 2nd ] [ ] key will display the operation executed. Pressing [ ] will display the operation from the beginning, with the cursor located under the first character. Pressing [ 2nd ] [ ] will display the operation from the end, with the cursor located at the space following the last character. You can continue moving the cursor by [ ] or [ 2nd ] [ ] and editin
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Running memory You should keep the following rules in mind when using running memory. • Press [ M+ ] to add a result to running memory and the " M " indicator appears when a number is stored in the memory. Press [ MR ] to recall the content of running memory. • Recalling from running memory by pressing [ MR ] key does not affect its contents . • Running memory is not available when you are in statistics mode. • The memory variable M and running memory utilize the same memory area.
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4) Type A functions which are required entering values before 2 pressing the function key, for example, x ,1/x, π, x!, %, RND, ENG, , , x ', y ' . y X 5) x , 6) Type B functions which are required pressing the function key –1 –1 –1 before entering, for example, sin, cos, tan, sin , cos , tan , –1 –1 –1 sinh, cosh, tanh, sinh , cosh , tanh , log, ln, FRAC, INT, √, X X 3 , 10 , e , NOT, EXP, DATA in STAT mode. 7) +/–, NEG 8) nPr, nCr 9) x , 10) +, – 11) AND, NAND –-- only Base–
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–1 < tanh x x 1 –99 100 log x, ln x ≦ < 1 x 10 x 1 x 10 x 100 10 < –1 x 10 < x 100 x 100 e < x ≦ –1 x 10 230.2585092 100 x ≦ x < 0 1 x 10 2 50 < x x 1 x 10 33 3 < 2.15443469003 x 10 x x 100 < 1/x x 1 x 10 , x ≠ 0 100 3 < x x 1 x 10 x ! ≦ ≦ 0 x 69, x is an integer. 100 2 2 R P < 1 x 10 x + y P R 100 ≦ < 0 r 1 x 10 10 < Deg：│θ │ 4.5 x 10 deg 8 Rad： < 2.5 x 10 πrad │θ │ 10 < Grad：│θ │ 5 x 10 grad however, for tan x Deg：│θ │≠ 90 (2n+1
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Result：Result displayed as fraction for integer when integer, numerator and 12 denominator are less than 1 x 10 100 ≦ ≦ ≦ nPr, nCr 0 r n, n 10 , n,r are integers. 50 50 STAT < < x 1 x 10 , y 1 x 10 σ σ x, y, , y ,a, b, r : n ≠ 0 ; x Sx, Sy：n ≠ 0, 1 ; x = 50 ; y = 50 ; n n Number of repeats ≤ 255, n is an integer. DEC ≦ x ≦ – 2147483648 2147483647 BIN ≦ x ≦ 0 01111111111111111111111111111111 (for zero or positive) ≦ 10000000000000000000000000000000 x ≦ 11
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7 + 5 x 4 = 27 DEG 7 [ + ] 5 [ x ] 4 [=] 7+ 5 4= 27 . For negative values, press [ +/– ] after entering the value; You can enter a number in mantissa and exponent form by [ EXP ] key. – 5 2.75 x 10 = 0.0000275 DEG 2.75 [ EXP ] 5 [ +/– ] [=] 2 . 75 E– 05 = 0 . 0 0 002 75 12 –11 Results greater than 10 or less than 10 are displayed in exponential form. 12369 x 7532 x 74010 = 6895016425080 12 = 6.89501642508 x 10 DEG 12369 [ x ] 7532 [ x ] 74010 12 3 6 9 753 2 7 [=]
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Percentage calculation [ 2nd ] [ % ] divides the number in the display by 100. You can use this key sequence to calculate percentages, add-ons, discounts, and percentage ratios. 120 x 30 % = 36 DEG 120 [ x ] 30 [ 2nd ] [ % ] [=] 12 0 30 % = 36 . 88 55 % = 160 DEG 88 [ ] 55 [ 2nd ] [ % ] [=] 88 55%= 16 0 . Display notations The calculator has the following display notations for the display value. Fixed-point / Floating Notations To specify the number of decimal places, pr
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DEG [ F E ] ↔ 6 7= –01 8 . 5 7 1 4 2 8 571 4 3 DEG [ ENG ] –03 8 5 7 . 1 4 2 8 571 4 3 DEG [ 2nd ] [ ] [ 2nd ] [ ] 03 0 . 0 0 0 8 5 7 142 8 5 Engineering Symbol Notation Each time you specify the ENG mode, a displayed result is automatically shown with the corresponding engineering symbol. giga yotta 24 zetta 21 exa 18 peta 15 tera 12 = 10 , = 10 , = 10 , = 10 , = 10 , = 10 Z E T G Y P mega kilo micro 9 6 3 milli – 3 – 6 , = 10 , = 10 , = 10 , = 10 , M K m μ pico nano – 9 – 12 f
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Scientific Functional Calculations Use MAIN ( [ MODE ] 1 ( MAIN ) ) mode for scientific function calculations. Logarithms and Antilogarithms The calculator can calculate common and natural logarithms and x x anti-logarithms using [ log ], [ ln ], [ 2nd ] [ 10 ], and [ 2nd ] [ e ]. ln 7 + log 100 = 3.94591014906 DEG [ ln ] 7 [ + ] [ log ] 100 [=] l n 7 + l o g 100 = 3 . 9 4 5 9 1 0 1490 6 2 –5 10 + e = 100.006737947 X X DEG [ 2nd ] [ 10 ] 2 [ + ] [ 2nd ] [ e ] 5 10 ^ 2+e
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2 1 9 4 = 4 = 4.5 = 4 2 2 DEG b b 4 [ a / ] 2 [ a / ] 4 [=] c c 4 2 4 = 4 1 2 . DEG b [ a / ] c 4 2 4 = 4 . 5 DEG b d [ a / ] [ 2nd ] [ / c e ] 4 2 4 = 9 2 . DEG d [ 2nd ] [ / ] e 4 2 4 = 4 1 2 . Calculations containing both fractions and decimals are calculated in decimal format. 4 8 + 3.75 = 12.55 5 DEG b b 8 [ a / ] 4 [ a / ] 5 [ + ] 3.75 c c 8 4 5 + 3 . 75 = [=] 12 . 55 Angle unit conversions The calculator enables you to convert an angle unit among degrees
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GRAD [ 2nd ] [ DRG ] 1 . 5 7 0 7 9 632 67 10 0 . Sexagesimal Decimal transformation ↔ The calculator enables you to convert the sexagesimal figure (degree, minute and second) to decimal notation by pressing [ ] or convert the decimal notation to the sexagesimal notation by [ 2nd ] [ ]. Sexagesimal figure value display is as follow : ׀ ׀ ׀ Represent 125 degrees (D), 125 45 30 55 45 minutes(M), 30.55 seconds(S) (Note) : The total digits of D, M and S and separator marks must be
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–1 3 sin 0.5 = 90 deg –1 DEG 3 [ 2nd ] [ sin ] 0.5 [=] –1 3 si n 0 . 5= 9 0 . Hyperbolic / Inverse-Hyp. functions SR-281N uses [ 2nd ] [ HYP ] to calculate the hyperbolic functions and –1 –1 inverse-hyperbolic functions - sinh, cosh, tanh, sinh , cosh and –1 tanh . (Note) : When using those keys, make sure the calculator is set for the angle unit you want. cosh 1.5 + 2 = 4.35240961524 DEG [ 2nd ] [ HYP ] [ cos ] 1.5 [ + ] 2 [=] co s h 1 . 5+2 = 4 . 3 5 2 4096 1 5 24 –1
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DEG [=] r 3 0 . 413 8 1 265 15 DEG ↔ [ 2nd ] [ X Y ] θ 8 0 . 53 7 6 777 92 o If r = 25, = 56 what are x, y ? Ans : x = 13.9798225868, θ y = 20.7259393139 DEG ( ) [ 2nd ] [ P R ] 25 [ 2nd ] [ ] 56 P R( 25 , 56 DEG [=] X 1 3 . 9 798 2 2 5 8 6 8 DEG ↔ [ 2nd ] [ X Y ] Y 2 0 . 7259 3 9 3 1 3 9 Probability This calculator provides the following probability functions : [ nPr ] Calculates the number of possible permutations of n item taken r at a time.
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5 ! = 120 DEG 5 [ 2nd ] [ x ! ] [=] 5! = 120 . Generates a random between 0.000 ~ 0.999 DEG [ 2nd ] [ RND ] Rn d 0 . 44 9 2 3 y 3 X Other functions ( 1/x, , , , x , x , x , INT, FRAC ) The calculator also provides reciprocal ( [ 2nd ] [ 1/x ] ), square root 3 X √ ( [ ] ), cubic root ( [ 2nd ] [ ] ), universal root ( [ 2nd ] [ ] ), 2 3 y square ( [ x ] ), cubic ( [ 2nd ] [ x ] ), and exponentiation ( [ x ] ) functions. 1 = 0.8 1.25 DEG 1.25 [ 2nd ] [ 1 / x
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Unit Conversion The calculator has a built-in unit conversion feature that enables you to convert numbers among different units. 1. Enter the number you want to convert. 2. Press [ CONV ] to display the menu. There are 7 menus, covering distance, area, temperature, capacity, weight, energy, and pressure. 3. Use the [ CONV ] to scroll through the list of units until a appropriate units menu is shown, then [=]. 4. Pressing [ ] or [ 2nd ] [ ] can convert the number to another unit.
