Citizen SR-270II manual Scientific Calculation

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The calculator enables you to repeat the last operation executed by pressing [ = ] key for further calculation. See Example 14.

Even if calculations are concluded with the [ = ] key, the result obtained can be used for further calculation. See Example 15.

￿Answer function

Answer function stores the most recently calculated result. It is re- tained even after the power is turned off. Once a numeric value or numeric expression is entered and [ = ] is pressed, the result is stored by this function. See Example 16.

(Note) : Even if execution of a calculation results in an error, however, Answer memory retains its current value.

Scientific Calculation

Use the COMP mode for scientific calculations.

￿Logarithms and Antilogarithms

The calculator can calculate common and natural logarithms and anti- logarithms using [ log ], [ ln ], [ 2nd ] [ 10 x ], and [ 2nd ] [ e x ]. See Example 17~19.

￿Fraction calculation

Fraction value display is as follow :

5

12

Display of

5

 

 

12

 

 

 

 

 

 

5

56 5

12

Display of 56

12

(Note) :Values are automatically displayed in decimal format whenever the total number of digits of a fractional values (integer + nu- merator + denominator + separator marks) exceeds 10.

To enter a mixed number, enter the integer part, press [ a b/c ], enter the numerator, press [ a b/c ], and enter the denominator ; To enter an improper fraction, enter the numerator, press [ a b/c ], and enter the denominator. See Example 20.

By pressing [ 2nd ] [ d/c ], the displayed value will be converted to the improper fraction and vice versa. To convert between a decimal and fractional result, press [ a b/c ] .See Example 21.

Calculations containing both fractions and decimals are calculated in decimal format. See Example 22.

￿Angle units conversion

The angle units (DEG, RAD, GRAD) is set by pressing [ MODE ] to display the angle menu. The relation among the three angle units is :

180 ° = π rad = 200 grad Angle conversions ( See Example 23.) :

1.Change the default angle settings to the units you want to convert to.

2.Enter the value of the unit to convert.

3.Press [ DRG] to display the menu.

D R G

1 2 3

The units you can select are D (degrees), R (radians), G (Gradians).

4.Choose the units you are converting from.

5.Press [ = ].

￿Trigonometric / Inverse-Tri. functions

SR-270IIprovides standard trigonometric functions and inverse trigo- nometric functions - sin, cos, tan, sin –1, cos –1and tan –1. See Example 24~26.

(Note) :When using those keys, make sure the calculator is set for the angle unit you want.

￿Hyperbolic / Inverse-Hyp. functions

SR-270IIuses [ 2nd ] [ HYP ] to calculate the hyperbolic functions and inverse- hyperbolic functions - sinh, cosh, tanh, sinh –1, cosh –1and tanh –1. See Example 27~28.

(Note) :When using those keys, make sure the calculator is set for the angle unit you want.

￿Sexagesimal Decimal transformation

Sexagesimal notation is as follow

12 ￿ 59 ￿ 45.6 ￿ Represent 12 Degree, 59 Minutes, 45.6 Seconds

The calculator can preform the conversion between decimal and

sexagesimal numbers by [ ] and [ 2nd ] [ ]. See Example 29~30.

￿Coordinates transformation

Rectangular Coordinates

Polar Coordinates

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Contents Before starting calculation General GuideError position display function Using 2nd keysCursor Making corrections during inputOrder of operations StackAccuracy and Capacity Functions Input rangeBasic Calculation Scientific Calculation Standard Deviation Calculation Regression CalculationProbability Other functions X2, x3, xyHDBMR17D101 MWB Example SR-270II / SR-275SCI +14 = 840 7 + 2 2 + 4 + 21+ 3 125 =139 Ex HDBM17D1508 MWB