Renkforce RF-CA-240 Operating Instructions Manual
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Renkforce RF-CA-240 Operating Instructions Manual

Scientific calculator
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Operating Instructions
RF-CA-240 Scientific Calculator
Item No. 2270443
N FIX SCI
SD
REG CMPLX MAT VGT
EQ
S
hyp
M STO
STO
RCL
r
A
D R G
Eng
R
I
10
Disp

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Summary of Contents for Renkforce RF-CA-240

  • Page 1 N FIX SCI REG CMPLX MAT VGT M STO D R G Disp Operating Instructions RF-CA-240 Scientific Calculator Item No. 2270443...

  • Page 2: Table Of Contents

    Table of contents Page 1. Introduction ..........................3 2. Removing and replacing the calculator’s cover ..............4 3. Safety precautions .......................5 4. Handling precautions ......................6 5. Two-line display ........................7 6. Before getting started ......................7 7. Basic calculations ......................10 8. Memory calculations ......................14 9. Scientific function calculations ..................16 10.

  • Page 3: Introduction

    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.

  • Page 4: Removing And Replacing The Calculator's Cover

    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. •...

  • Page 5: Safety Precautions

    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 •...

  • Page 6: Handling Precautions

    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. •...

  • Page 7: Two-Line Display

    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.
  • Page 8 Note! • To return the calculation mode and setup to the initial defaults shown below, press (Mode) Calculation mode: COMP Angel unit: Exponential display format: Norm1 Fraction display format: Decimal point character: • Mode indicators appear in the upper part of the display, •...
  • Page 9 • Pressing does not clear replay memory, so you can recall the last calculation even after you press • 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 When you initialize modes and settings by pressing (Mode) When you change from one calculation mode to another When you turn off the calculator. „...

  • Page 10: Basic Calculations

    • 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.
  • Page 11 • 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: •...
  • Page 12 • 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.
  • Page 13 • 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 • Example 6: What is the percentage rise when temperature goes from 40 °C to 46°C? How about to 48°C? „...

  • Page 14: Memory Calculations

    • Press the number key ( , or ) that corresponds to the setup item you want to change. Number of decimal places (Fix): Number of significant digits (Sci): (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. (Internal rounding) •...
  • Page 15 „ 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 followed by a letter (A through F, or M, X, or Y).

  • Page 16: Scientific Function Calculations

    • 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. • =3.14159265359 „...
  • Page 17 • 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 •...
  • Page 18 • 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.

  • Page 19: Statistical Calculations

    „ 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) •...
  • Page 20 To recall this type of value: Perform this key operation: • Example: To calculate , and for the following data: 55, 54, 51, 55, 53, 53, 54, 52 In the SD Mode: 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).
  • Page 21 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. • 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.
  • Page 22 (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.
  • Page 23 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 •...
  • Page 24 • 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 formula terms and correlation coefficien for the data nearby. 10°C 1003 hPa Next, use the regression formula to estimate atmospheric 15°C 1005 h Pa pressure at 18°C and temperature at 1000hPa. Finally, calculate the coefficient of determination (r2) and sample 20°C 1010 hPa...
  • Page 25 • 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 •...

  • Page 26: Technical Information

    Data input precautions • inputs the same data twice. • You can also input multiple entries of the same data using . To input the data “20 and 30” five times, for example, Press 20 • The above results can be obtained in any order, and not necessarily that shown above. •...
  • Page 27 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. •...
  • Page 28 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 • Operations of the same precedence are performed from right to left. •...
  • Page 29 „Input Ranges Internal digits: 12 Accuracy*: As a rule,accuracy is ±1 at the 10th digit. Functions Input range Same as sinx,except when Same as sinx,except when Same as sinx,except when...
  • Page 30 Pol (x, y) Rec (r, θ) Decimal 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). (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. (This is also true of internal consecutive calculations that are performed in the case of nPr, nCr, etc.) In the vicinity of a function’s singular point and point of inflection, errors are cumulative and...

  • Page 31: Power Supply

    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 Screw Screw 1.

  • Page 32: Disposal

    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.

  • Page 33: Technical Data

    13. Technical data Power supply ........L1131F x 2pcs (1.5V each) Battery life ........ A pproximately 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 ....0 °C to 40 °C (32 °F to 104 °F)
  • Page 34 This is a publication by Conrad Electronic SE, Klaus-Conrad-Str. 1, D-92240 Hirschau (www.conrad.com). All rights including translation reserved. Reproduction by any method, e.g. photocopy, microfilming, or the capture in electronic data processing systems require the prior written approval by the editor. Reprinting, also in part, is prohibited. This publication represent the technical status at the time of printing. Copyright 2020 by Conrad Electronic SE.

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