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Contrast adjustment
Pressing the [] or [] following [ MODE ] key can make the contrast of
the screen lighter or darker. Holding either key down will make the dis-
SR-270II
play become respectively lighter or darker.
Scientific Calculator
Display readout
The display comprises the entry line, the result line, and indicators.
General Guide
Indicator DEG
Indicator
Entry line 74 – 8 ÷ 7
66. Result line
Turning on or off
Entry line SR-270II displays an entry of up to 79 digits. Entries be
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Each time [ MODE ] is pressed, various functions menus and all argu- Replay function ment values corresponding to the desired mode is shown on the screen. This function stores the latest operation executed. After execution is It includes three calculation modes (COMP, SD, REG), three angle units completed, pressing [ 2nd ] [] or [ 2nd ] [] key will display the opera- (DEG, RAD, GRAD), four display notations (FIX, SCI, NORM, ENG) tion from the beginning or the end. You can continue moving
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10 Grad : 0 < l x l < 4.499999999 x 10 Stack however, for tan x This calculator uses memory areas, called “ stacks “, to temporarily Deg : | x | ≠ 90 (2n–1) store values (numeric stack) and commands (command stack ) accord- π Rad : | x | ≠ (2n–1) 2 ing to their precedence during calculations. The numeric stack has 10 Grad : | x | ≠ 100 (2n–1) ( n is an integer) levels and command stack has 24 levels. A stack error (Stk ERROR) 10 cos x Deg : 0 < l x l < 4.500000008 x 10 occurs wheneve
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100 1 [ 2nd ] [ % ] divides the number in the display by 100. You can use this y > 0 : x ≠ 0, –1 x 10 < log y <100 x key sequence to calculate percentages, add-ons, discounts, and per- y = 0 : x > 0 centages ratios. See Example 9~10. y < 0 : x = 2n+1, I/n, n is an integer.(n ≠ 0) 100 1 but – 1 x 10 < log l y l <100 Display formats x This calculator has the following four display notation mode for the dis- nPr, nCr 0 < n < 99, r < n, n,r are integers. play value. 50 50 100
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The calculator enables you to repeat the last operation executed by Angle units conversion pressing [ = ] key for further calculation. See Example 14. The angle units (DEG, RAD, GRAD) is set by pressing [ MODE ] to Even if calculations are concluded with the [ = ] key, the result obtained display the angle menu. The relation among the three angle units is : can be used for further calculation. See Example 15. 180 ° = π rad = 200 grad Angle conversions ( See Example 23.) : Answer fun
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Y − − 2 Y ∑x [ RCL ] + [ A ] x [ 2nd ] + [ x ] P( r, θ) P( x, y ) ∑x [ RCL ] + [ B ] X σn [ 2nd ] + [ X σn ] r y x + y i= r (cosθ + i sinθ ) n [ RCL ] + [ C ] X σn-1 [ 2nd ] + [ X σn-1 ] θ X 0 0 x X The calculator can perform the conversion between rectangular coor- Regression Calculation dinates and polar coordinates by [ ALPHA ] [ Pol ( ] and [ ALPHA ] [ Rec ( ]. Calculation results are automatically stored in memory vari- ☺ Use the REG mode for regression calculations. able
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2 ∑x [ RCL ] + [ A ] x σn [ 2nd ] + [ xσn ] ∑x [ RCL ] + [ B ] x σn-1 [ 2nd ] + [ x σn-1 ] − − n [ RCL ] + [ C ] [ 2nd ] + [ ] y y 2 ∑y [ RCL ] + [ D ] y σn [ 2nd ] + [ y σn ] ∑y [ RCL ] + [ E ] y σn-1 [ 2nd ] + [ y σn-1 ] ∑xy [ RCL ] + [ F ] A [ 2nd ] + [ A ] 3 ∑x [ RCL ] + [ M ] B [ 2nd ] + [ B ] 2 ∑x y [ RCL ] + [ X ] C [ 2nd ] + [ C ] 4 ∑x [ RCL ] + [ Y ] r [ 2nd ] + [ r ] ∧ ∧ − − x [ 2nd ] + [ x ] x [ 2nd ] + [ x ] ∧ ∧ y [ 2nd ] + [ y ] The unit complies with the requi
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DEG [] [ 2nd ] [ INS ] 1 [ = ] 14 / 10 2.3 3.22 SR-270II / SR-275 Example 4 Example [ ( 3 x 5 ) + ( 56 ÷ 7 ) – ( 74 – 8 x 7 ) ] = 5 DEG 3 [ x ] 5 [ STO ] [ M ] M = M 15. Example 1 DEG Change 123 x 456 as 12 x 457 56 [ ÷ ] 7 [ M+ ] 56 / 7 DEG M 123 [ x ] 456 [ = ] 8. 123 456 DEG 56088. [ 2nd ] [ RCL ] [ M ] M = DEG [] [] [] [ DEL ] M 23. 12 456 56088. DEG 74 [ – ] 8 [ x ] 7 [ 2nd ] [ M– ] 74 – 8 7 DEG [] [] [] 7 M 18. 12 457_ 56088. DEG [ 2nd ] [ RCL ] [
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DEG [ 2nd ] [ Mcl ] [ = ] [ MODE ] [ MODE ] [ MODE ] 2 Mcl SCI 0 ~ 9 ? 0. DEG SCI 4 Example 6 6 / 7 –01 – 2 8.571 ( 2 + 3 ) x 10 = 0.05 X 10 DEG [ MODE ] [ MODE ] [ MODE ] [ MODE ] [ ( ] 2 [ + ] 3 [ ) ] [ x ] 1 [ EXP ] [ (–) ] 2 [ = ] ENG RESET ( 2 + 3 )1 E –2 1 2 0.05 DEG ENG 1 Example 7 6 / 7 –03 2 + 3 x ( 5 + 4 ) = 29 857.1428571 X 10 DEG 2 [ + ] 3 [ x ] [ ( ] 5 [ + ] 4 [ = ] Example 12 2 + 3 ( 5 + 4 29. 150 m = 150000 cm = 0.15 km DEG 150 [ = ] [ EN
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DEG [ = ] Example 21 Ans 3 81. Example 15 To calculate ÷ 6 after 3 x 4 = 12 b b DEG 4 [ a / ] 2 [ a / ] 4 [ = ] c c DEG 4 2 4 3 [ x ] 4 [ = ] ¢} ¢} 4 1 2 3 4 ¢} ¢} 12. b DEG [ a / ] c DEG 4 2 4 [ ÷ ] 6 [ = ] ¢} ¢} 4.5 Ans / 6 2. d DEG [ 2nd ] [ / ] c 4 2 4 ¢} ¢} Example 16 9 2 ¢} 123 + 456 = 579 789 – 579 = 210 d DEG [ 2nd ] [ / ] c DEG 123 [ + ] 456 [ = ] 4 2 4 ¢} ¢} 123 + 456 4 1 2 ¢} ¢} 579. DEG 789 [ – ] [ Ans ] [ = ] Example 22 789 – Ans 210. 4 8 +3.75 =12.5
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Example 30 [ MODE ] [ MODE ] DEG RAD GRAD 2 45 10.5 = 2.752916667 1 2 3 DEG 2 [ ] 45 [ ] 10.5 [ ] [ = ] DEG 1 [ sin ] 30 [ = ] 2 ° 45 ° 10.5 ° sin 30 2 45 10.5 0.5 DEG [ ] Example 25 2 ° 45 ° 10.5 ° 2.752916667 2 π cos ( rad ) = – 0.5 3 Example 31 If x = 5 , y = 30, what are r , θ ° Ans : r = 30.41381265 θ = 80.53767779 ° [ MODE ] [ MODE ] DEG RAD GRAD 1 2 3 , DEG [ ALPHA ] [ Pol ( ] 5 [ ] 30 [ = ] RAD Pol (
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SD DEG 3 [ DT ] 2 [ DT ] 5 [ DT ] 9 [ DT ] Example 35 2 [ 2nd ] [ RCL ] [ A ] ∑x 5 ! = 120 119. DEG SD DEG 5 [ 2nd ] [ x ! ] [ = ] [ 2nd ] [ RCL ] [ B ] 5 ! ∑x 120. 19. SD DEG [ 2nd ] [ RCL ] [ C ] Example 36 n = Generates a random number between 0.000 ~0.999 4. − DEG SD DEG [ 2nd ] [ RANDOM ] [ = ] [ 2nd ] [ x ] [ = ] − Ran # x 0.388 4.75 SD DEG [ 2nd ] [ X σn ] [ = ] Example 37 X σn 2.680951324 1 = 0.8 1.25 SD DEG [ 2nd ] [ X σn-1 ] [ = ] X σn-1 –
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Example 43 Find A, B, and C for the following data using quadratic regression and estimate y’ = ? for x = 58 and x’ =? for y =143 n1 2 3 x576167 y 101 117 155 [ MODE ] 3 [] Pwr Inv Quad 1 2 3 REGDEG 3 [ 2nd ] [ Scl ] [ = ] Scl 0. , , REGDEG 57 [ ] 101 [ DT ] 61 [ ] 117 [ DT ] , 67 [ ] 155 [ DT ] [ 2nd ] [ A ] [ = ] A M 684.3 REGDEG [ 2nd ] [ B ] [ = ] B M 23.53333333 REGDEG [ 2nd ] [ C ] [ = ] C M 0.233333333 ∧ REGDEG 58 [ 2nd ] [ y ] ∧ y M 104.3 ∧ REGDEG 14
