N FIX SD REG CMPLX MAT VGT EQSCI S A hyp M STO RCL DR Gr Eng R I 10 Disp Operating Instructions RF-CA-240 Scientific Calculator Item No.
Table of contents Page 1. Introduction...........................................................................................................................3 2. Removing and replacing the calculator’s cover....................................................................4 3. Safety precautions................................................................................................................5 4. Handling precautions.........................................................................
1. Introduction Dear Customer, Thank you for purchasing this product. This product complies with the statutory national and European requirements. To maintain this status and to ensure safe operation, you as the user must observe these operating instructions! These operating instructions are part of this product. They contain important notes on commissioning and handling. Also consider this if you pass on the product to any third party.
2. Removing and replacing the calculator’s cover • Before starting...... Holding the cover as shown in the illustration, slide the unit out of the cover. • After you are finished...... Holding the cover as shown in the illustration, slide the unit out of the cover. • Always slide the keyboard end of the unit into the cover first. Never slide the display end of the unit into the cover.
3. Safety precautions Be sure to read the following safety precautions before using this calculator. Keep this manual handy for later ref. erence. Caution This symbol is used to indicate information that can result in personal injury or material damage if ignored. Batteries • After removing the battery from the calculator, put it in a safe place where it will not get into the hands of small children and accidentally swallowed. • Keep batteries out of the reach of small children.
4. Handling precautions • Be sure to press the key before using the calculator for the first time. • Even if the calculator is operating normally, replace the battery at least once every two years. A dead battery can leak, causing damage to and malfunction of the calculator. Never leave a dead battery in the calculator. • The battery that comes with this unit discharges slightly during shipment and storage. Because of this, it may require replacement sooner than the normal expected battery life.
5. Two-line display The two-line display makes it possible to view both the calculation formula and its result at the same time. • The upper line shows the calculation formula. • The lower line shows the result. A separator symbol is displayed every three digits when the integer part of the mantissa has more than three digits. 6. Before getting started Modes Before starting a calculation, you must first enter the correct mode as indicated in the table below.
Note! • To return the calculation mode and setup to the initial defaults shown below, press (Mode) . Calculation mode: Angel unit: Exponential display format: Fraction display format: Decimal point character: COMP Deg Norm1 Dot • Mode indicators appear in the upper part of the display, • Be sure to check the current calculation mode (SD, REG, COMP) and angle unit setting (Deg, Rad, Gra) before beginning a calculation. Input capacity • The memory area used for calculation input can hold 79 “steps”.
• Pressing you press does not clear replay memory, so you can recall the last calculation even after . • Replay memory capacity is 128 bytes for storage of both expressions and results. • Replay memory is cleared by any of the following actions. When you press the key When you initialize modes and settings by pressing (Mode) When you change from one calculation mode to another When you turn off the calculator.
• Norm 2 With Norm 2, exponential notation is automatically used for integer values with more than 10 digits and decimal values with more than nine decimal places. • All of the examples in this manual show calculation results using the Norm 1format. Decimal point and separator symbols You can use the display setup (Disp) screen to specify the symbols you want for the decimal point and 3-digit separator.
• It is not necessary to enclose a negative exponent within parentheses. • Example 1: • Example 2: • You can skip all operations before . Fraction operations • Fraction calculations • Values are displayed in decimal format automatically whenever the total number of digits of a fractional value (integer + numerator + denominator+ separator marks) exceeds 10. • Example 1: • Example 2: • Example 3: • Example 4: • Results of calculations that mix fraction and decimal values are always decimal.
• Mixed fraction Improper fraction conversion • Example: • You can use the display setup (Disp) screen to specify the display format when a fraction calculation result is greater than one. • To change the fraction display format, press the A key a number of times until you reach the setup screen shown below. • Display the selection screen. • Press the number key ( or ) that corresponds to the setting you want to use.
• Example 3: To add 15% onto 2500 (2875) • Example 4: To discount 3500 by 25% (2625) • Example 5: If 300 grams are added to a test sample originally weighing 500 grams, what is the percentage 800 500 • Example 6: What is the percentage rise when temperature goes from 40 °C to 46°C? How about to 48°C? Degrees, minutes, seconds calculations • You can perform sexagesimal calculations using degrees (hours), minutes, and seconds, and convert between sexagesimal and decimal values.
• Press the number key ( change. , , or ) that corresponds to the setup item you want to (Fix): Number of decimal places (Sci): Number of significant digits (Norm): Exponential display format • Example 1: (Specifies three decimal places.) (Internal calculation continues using 12 digits.) The following performs the same calculation using the specified number of decimal places.
Answer memory • Whenever you press after inputting values or an expression, the calculated result automatically updates Auswer Memory contents by storing the result. • In addition to , , , Answer Memory contents are also updated with result whenever you press or followed by a letter (A through F, or M, X, or Y). • You can recall Answer memory contents by pressing . • Answer memory can store up to 12 digits for the mantissa and two digits for the exponent.
• Example: 9. Scientific function calculations Use the key to enter the COMP Mode when you want to perform basic arithmetic calculations. COMP..................................................................................................................... • Certain types of calculations may take a long time to complete. • Wait for the result to appear on the display before starting the next calculation. • =3.
• Example 3: • Example 4: Hyperbolic/Inverse hyperbolic functions • Example 1: • Example 2: Common and natural logarithms/ Antilogarithms • Example 1: • Example 2: • Example 3: • Example 4: • Example 5: Square roots, Cube roots, Roots, Squares, Cubes, Reciprocals, Factorials, Random numbers, , and Permutation/Combination • Example 1: • Example 2: • Example 3: 17
• Example 4: • Example 5: • Example 6: • Example 7: • Example 8: To generate a random number between 0.000 and 0.999 (The above value is a sample only. Resulys differ each time.) • Example 9: • Example 10: To determine how many different 4-digit values can be produced using the numbers 1 through 7. • Numbers cannot be duplicated within the same 4-digit value (1234 is allowed,but 1123 is not). • Example 11: To determine how many different 4-member groups can be organized in a group of 10 individuals.
Coordinate conversion (Pol (x,y), Rec(r, )) • Calculation results are automatically assigned to variables E and F. • Example 1: To convert polar coordinates (r=2, =60°) to rectangular coordinates (x,y) (Deg) • Press to display the value of x, or to display the value of y. • Example 2: To convert rectangular coordinates (1, 3) to polar coordinates (r, ) (Rad) • Press to display the value of r, or to display the value of .
To recall this type of value: • Example: To calculate 53, 53, 54, 52 In the SD Mode: Perform this key operation: , and for the following data: 55, 54, 51, 55, Stat clear Each time you press to register your input, the number of data input up to that point is indicated on the display (n value). Sample standard deviation Population standard deviation Arithmetic mean (x) Number of data (n) Sun of values Sun of squares of values Data input precautions • inputs the same data twice.
You can then edit the displayed data, if you want.lnput the new value and then press the to replace the old value with the new one. key • Pressing the key instead of after changing a value on the display registers the value you input as a new data item,and leaves the old value as it is. • You can delete a data value displayed using and a data value causes all values following it to be shifted up. by pressing . Deleting • Data values you register are normally stored in calculator memory.
(Lin): Linear regression (Log): Logarithmic regression (Exp): Exponential regression (Pwr): Power regression (Inv): Inverse regression (Quad): Quadratic regression • Always start data input with (ScI) to clear statistical memory. • Input data using the key sequence shown below. • The values produced by a regression calculation depend on the values input, and results can be recalled using the key operations shown in the table below.
To recall this type of value: Perform this key operation: Regression coefficient A Regression coefficient B Regression calculation other than quadratic regression Correlation coefficient r • The following table shows the key operations you should use to recall results in the case of quadratic regression. To recall this type of value: Perform this key operation: Regression coefficient C • The values in the above tables can be used inside of expressions the same way you use variables.
• Linear regression The regression formula for linear regression is: y=A+Bx. • Example: Atmospheric Pressure vs.Temperature Temperature Atmospheric Perform linear regression to determine the regression 10°C 1003 hPa formula terms and correlation coefficien for the data nearby. Next, use the regression formula to estimate atmospheric 15°C 1005 h Pa pressure at 18°C and temperature at 1000hPa. Finally, 20°C 1010 hPa calculate the coefficient of determination (r2) and sample covariance.
• Logarithmic, Exponential, Power, and Inverse regression • Use the same key operations as linear regression to recall results for these types of regression. • The following shows the regression formulas for each type of regression. Logarithmic regression Exponential regression Power regression Inverse regression • Quadratic regression • The regression formula for quadratic regression is: y=A+Bx+Cx2. • Example: Xi yi 29 1.6 50 23.5 74 38.0 103 46.4 118 48.
Data input precautions • inputs the same data twice. • You can also input multiple entries of the same data using 30” five times, for example, Press 20 30 5 . . To input the data “20 and • The above results can be obtained in any order, and not necessarily that shown above. • Precautions when editing data input for standard deviation also apply for regression calculations. 11. Technical information When you have a problem......
Stack ERROR • Cause • The capacity of the numeric stack or operator stack is exceeded. • Action • Simplify the calculation.The numeric stack has 10 levels and the operator stack has 24 levels. • Divide your calculation into two or more separate parts. Syntax ERROR • Cause • An attempt to perform an illegal mathematical operation. • Action • Press or to display the calculation with the cursor located at the location of the error and make required corrections.
6. Type B functions: With these functions, the function key is pressed and then the value is entered. 7. Abbreviated multiplication format in front of Type B functions: , Alog2, etc. 8. Permutation and combination: nPr, nCr 9. 10. • Operations of the same precedence are performed from right to left. • Other operations are performed from left to right. • Operations enclosed in parentheses are performed first.
Input Ranges Internal digits: 12 Accuracy*: As a rule,accuracy is ±1 at the 10th digit.
nCr Pol (x, y) Rec (r, θ) Decimal 0 Sexagesimal conversions (n is an integer) However: (n ≠ 0; n is an integer) However: Total of integer,numerator,and denominator must be 10 digits or less (including division marks). SD (REG) * Fora single calculation,calculation error is ±1 at the 10th digit. (In the case of exponential display, calculation error is ±1 at the last significant digit.) Errors are cumulative in the case of consecutive calculations, which can also cause them to become large.
11. Power Supply This calculator is powered by 2pcs of button cell battery type L1131F. • Replacing the Battery Dim figures on the display of the calculator indicate that battery power is low. Continued use of the calculator when the battery is low can result in improper operation. Replace the battery as soon as possible when display figures become dim. • To replace the battery 1. Press Screw to turn power off. Screw 2.
12. Disposal a) Product Electronic devices are recyclable waste and must not be disposed of in the household waste. Dispose of the product according to the applicable statutory provisions at the end of its service life. Remove any inserted (rechargeable) batteries and dispose of them separately from the product. b) (Rechargeable) batteries You as the end user are required by law (Battery Ordinance) to return all used (rechargeable) batteries. Disposing of them in the household waste is prohibited.
13. Technical data Power supply...................................L1131F x 2pcs (1.5V each) Battery life........................................ Approximately 17,000 hours continuous display of flashing cursor. Approximately 2 years when left with power turned off Dimensions......................................166(H) X 85(W) X 15(D)mm Power consumption.........................0.0002 W Operating temperature....................
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