1. Introducció
This manual provides detailed instructions for the operation and maintenance of your Casio fx-991ES Plus C 2nd Edition and Casio fx-991CW Advanced Scientific Calculators. These calculators are designed for students and professionals in science, mathematics, and engineering, offering a wide range of advanced functions to support complex calculations.
2. Característiques clau
Casio fx-991ES Plus C 2nd Edition
Imatge: Frontal view of the Casio fx-991ES Plus C 2nd Edition calculator, showcasing its display and button layout.
- Visualització de llibres de text naturals: Shows formulas and results exactly as they appear in textbooks.
- Numerical Differentiation/Integration: Supports calculus operations.
- Matrix 4x4 / Vector Calculations: Advanced linear algebra capabilities.
- Two-variable Statistical Regression: Comprehensive statistical analysis.
- Complex Number Calculations: Performs operations with complex numbers.
- Base-n Calculations: Supports calculations in different number bases.
- Polynomial and Simultaneous Equation Calculations: Solves equations up to certain degrees.
- SOLVE Function: Finds solutions for equations.
- Number Factorization, LCM, GCD: Utility functions for number theory.
Casio fx-991CW Advanced Scientific Calculator
Imatge: Frontal view of the Casio fx-991CW Advanced Scientific Calculator, highlighting its user interface and display.
- High-resolution Natural Textbook Display: Enhanced display with variable contrast for cursor identification.
- Numerical Differentiation/Integration: Includes templates for calculus.
- Matrix 4x4 / Vector Calculations / Complex Numbers: Comprehensive advanced math functions.
- Two-variable Statistical Regression and Visualization with QR Code: Advanced statistics with data visualization via QR code link to smartphone.
- Base-n Calculations: Supports various number bases.
- Logarithms with Definable Base: Flexible logarithmic calculations.
- Direct Engineering Calculations: Unit conversions and engineering notation.
- Polynomial and Simultaneous Equation Calculations: Solves complex algebraic problems.
- Mode de taula: Permits f(x) & g(x) advanced calculus functions and association.
- SOLVE Function and Ratios: Equation solving and ratio calculations.
- Spreadsheet Functionality: Unique non-graphing calculator with spreadsheet capabilities.
Image: Diagram illustrating design features like easy-to-press cursor keys and quality aspects such as wear-resistant, drop-resistant body, and the Web Authenticity Check System using QR codes.
3. Configuració
3.1 Font d'alimentació
Both calculators are powered by a combination of solar energy and a button-cell battery. The solar panel provides power in well-lit environments, while the battery ensures operation in low-light conditions. No initial battery installation is typically required as they come pre-installed.
3.2 Initial Power On and Display Adjustment
- Per engegar la calculadora, premeu la tecla [ACTIVAT] botó.
- If the display is dim, adjust the contrast. For the fx-991ES Plus C 2nd Edition, press [MAJÚS] aleshores [MODE SETUP], navigate to 'CONT' (Contrast), and use the arrow keys to adjust. For the fx-991CW, navigate to 'SETTINGS' from the HOME screen and select 'Display Contrast'.
- Per apagar la calculadora, premeu [MAJÚS] aleshores [AC] (DESACTIVAT).
4. Instruccions de funcionament
4.1 Operacions bàsiques
- Inputting Expressions: Enter numbers and operations in the order they appear. The Natural Textbook Display allows for intuitive input of fractions, roots, and other complex expressions.
- Execució de càlculs: Premeu [=] (fx-991ES Plus C 2nd Edition) or [EXE] (fx-991CW) to obtain the result.
- Correcció: Ús [DEL] to delete the last character. Use [AC] per esborrar tot el càlcul.
4.2 Advanced Functions (Common to both models, with variations)
- Selecció del mode: Premeu [MODE SETUP] (fx-991ES Plus C 2nd Edition) or navigate from the [INICI] screen (fx-991CW) to select calculation modes (e.g., COMP, STAT, TABLE, MATRIX, VECTOR, EQN, BASE-N, CMPLX).
- Calculus (Integration/Differentiation): Access these functions via [MAJÚS] and the respective keys. Input the function, variable, and limits as prompted on the display.
- Estadístiques: Select STAT mode. Input data into lists. Perform 2-variable statistics and various regression types (linear, quadratic, exponential, etc.). Results include mean, standard deviation, correlation coefficient.
- Matrix/Vector Calculations: Define matrices/vectors by entering their dimensions and elements. Perform operations such as addition, subtraction, multiplication, determinant, inverse, and transpose.
- Nombres complexos: Switch to CMPLX mode. Input complex numbers using the imaginary unit [i] (fx-991ES Plus C 2nd Edition) or [ENG] (fx-991CW).
- Base-n Calculations: Use BASE-N mode to perform calculations in binary, octal, decimal, and hexadecimal.
- Equation Solving: Use EQN mode to solve simultaneous linear equations (up to 4 variables) and polynomial equations (up to 4th degree).
- SOLVE Function: Input an equation and a variable to solve for. The calculator will find a numerical solution.
4.3 Specific Functions (fx-991CW)
- Full de càlcul: Access the Spreadsheet application from the HOME screen. This allows for basic spreadsheet operations, including cell input, formulas, and calculations.
- Funció del codi QR: For certain calculation results (e.g., statistics graphs, table mode), the calculator can generate a QR code. Scan this code with a smartphone to visualize the data or access additional information online.
5. Manteniment
5.1 Substitució de la bateria
When the display becomes dim even in bright light, the battery may need replacement. Refer to the specific battery type (e.g., LR44 or equivalent) indicated on the back of your calculator. Carefully open the battery compartment, replace the old battery with a new one, ensuring correct polarity, and close the compartment securely.
5.2 Neteja
Wipe the calculator with a soft, dry cloth. Do not use abrasive cleaners, solvents, or wet cloths, as these can damage the casing o components interns.
5.3 Emmagatzematge
Store the calculator in a cool, dry place away from direct sunlight, extreme temperatures, and high humidity. Use the provided hard case to protect the calculator from impacts and scratches.
Images: Casio fx-991ES Plus C 2nd Edition and fx-991CW calculators shown with their respective protective slide-on covers, designed for durability and ease of use.
6. Solució De Problemes
| Problema | Solució |
|---|---|
| La calculadora no s'encén. | Ensure sufficient light for the solar panel. If in low light, the battery may be depleted. Replace the battery if necessary. |
| La pantalla és tènue o difícil de llegir. | Adjust the display contrast in the calculator's settings (refer to section 3.2). Ensure adequate lighting for the solar panel. |
| Resultats de càlcul incorrectes. | Check the current calculation mode (e.g., DEG/RAD, COMP/STAT). Clear all memory ([MAJÚS] [CLR] or [RESET]) and try again. Verify input syntax. |
| Calculator freezes or becomes unresponsive. | Premeu el botó [ACTIVAT] button. If unresponsive, gently press the RESET button on the back of the calculator (requires a thin, pointed object like a paperclip). Note that resetting will clear all memory. |
| QR code does not scan or link. | Ensure good lighting and a steady hand when scanning. Verify your smartphone's QR code reader app is up-to-date. Ensure internet connectivity for the linked content. |
7. Especificacions
| Característica | Detall |
|---|---|
| Marca | Casio |
| Noms dels models | fx-991ES Plus C 2nd Edition, fx-991CW |
| Tipus de visualització | LCD (Natural Textbook Display) |
| Font d'alimentació | Alimentat per bateria, amb energia solar |
| Tipus de material | Plàstic |
| Tipus de calculadora | Enginyeria/Científic |
| Color | Negre |
8. Garantia i Suport
For detailed warranty information, product registration, and technical support, please refer to the official Casio website or the documentation included with your purchase. Casio provides support for their products to ensure customer satisfaction.
You can also visit the official Casio Store for more information and resources: Casio Education Store
