1. Introducció
This manual provides detailed instructions for the proper use and maintenance of your Casio FX-991ARX Scientific Calculator. Designed for academic and professional environments, this calculator offers a wide range of functions for various mathematical and scientific computations. Please read this manual thoroughly to ensure optimal performance and longevity of your device.
The Casio FX-991ARX is a scientific calculator featuring a Full Dot Matrix display and is powered by both battery and solar energy, ensuring reliable operation.
2. Producte acabatview
Figura 2.1: Frontal View of the Calculator. This image displays the front of the Casio FX-991ARX scientific calculator, highlighting its Full Dot Matrix display, alphanumeric keypad, and solar panel. The layout includes function keys, numeric keys, and navigation buttons.
Figura 2.2: Esquena View of the Calculator. This image shows the rear side of the Casio FX-991ARX calculator, featuring the battery compartment cover and anti-slip feet. The Casio brand name is embossed on the back casing.
2.1 Components clau
- Visualització: Full Dot Matrix display for clear representation of equations, graphs, and results.
- Teclat: Ergonomically designed keys for numerical input, scientific functions, and menu navigation.
- Panell solar: Assists in powering the calculator in well-lit environments.
- Compartiment de la bateria: Located on the back, housing the backup battery.
3. Configuració inicial
3.1 Font d'alimentació
The Casio FX-991ARX operates on a dual power system: solar power and a single A-type battery (included). The solar panel provides power in sufficient light, while the battery ensures operation in low-light conditions or when solar power is insufficient.
3.2 Instal·lació de la bateria
- Assegureu-vos que la calculadora estigui apagada.
- Locate the battery compartment cover on the back of the calculator (refer to Figure 2.2).
- Using a small screwdriver, carefully remove the screw securing the cover.
- Remove the cover and insert the A-type battery, ensuring correct polarity (+/-).
- Col·loqueu la coberta i fixeu-la amb el cargol.
3.3 Encesa/apagada
- Per engegar la calculadora, premeu la tecla [ACTIVAT] clau.
- Per apagar la calculadora, premeu [MAJÚS] aleshores [AC] (DESACTIVAT).
3.4 Configuració inicial
Upon first use or after a reset, you may need to adjust basic settings:
- Contrast: Premeu [MAJÚS] aleshores [MENU/SETUP], navigate to 'Contrast', and adjust using the arrow keys.
- Unitat d'angle: Premeu [MAJÚS] aleshores [MENU/SETUP], navigate to 'Angle Unit', and select Deg (degrees), Rad (radians), or Gra (gradians).
4. Operacions bàsiques
4.1 Arithmetic Calculations
Introduïu números i operadors en seqüència. Premeu [=] per obtenir el resultat.
Example: 5 + 3 x 2 = 11
4.2 Inputting Expressions
The calculator allows natural input of expressions as they appear in textbooks. Use parentheses [(] i [)] to define calculation order.
4.3 Correction and Deletion
- Premeu [DEL] to delete the character at the cursor position.
- Premeu [AC] to clear the entire calculation and reset the display.
5. Scientific Functions
The FX-991ARX provides a comprehensive set of scientific functions. Most functions are accessed directly or by pressing [MAJÚS] or [ALFA] followed by the desired key.
5.1 Funcions comunes
- Trigonometric: [sin], [cos], [tan] i les seves funcions inverses ([MAJÚS] + sin/cos/tan).
- Logarítmic: [log] (base 10), [ln] (logaritme natural).
- Potències i arrels: [x²], [x³], [√], [³√], [x^y].
5.2 Constants and Conversions
Access a library of scientific constants and unit conversions by pressing [MAJÚS] + [CONST] or [MAJÚS] + [CONV] respectively, then selecting the desired option from the menu.
5.3 Funcions de memòria
Emmagatzemar i recuperar valors mitjançant les tecles de memòria:
- Botiga: [STO] followed by a memory variable (A-F, X, Y, M).
- Recorda: [RCL] followed by a memory variable.
6. Funcions avançades
6.1 Equation Solving
The calculator can solve various types of equations. Access the Equation mode via [MENÚ]. Follow the on-screen prompts to input coefficients and variables. Note that specific equation types and variable handling may vary; refer to the on-screen instructions for detailed guidance.
6.2 Statistical Calculations
Enter Statistical mode from the [MENÚ] to perform calculations such as mean, standard deviation, and regression analysis. Input data and select the desired statistical calculation.
6.3 Matrix and Vector Calculations
The FX-991ARX supports matrix and vector operations. Select the appropriate mode from [MENÚ] to define matrices/vectors, perform additions, subtractions, multiplications, and other related calculations.
6.4 QR Code Function
The calculator includes a QR Code function. Press [MAJÚS] + [QR] to generate a QR code for certain calculation results or data, which can then be scanned by a smart device for further analysis or visualization.
7. Manteniment i cura
7.1 Neteja
Wipe the calculator with a soft, dry cloth. For stubborn dirt, dampen the cloth slightly with water and a mild detergent, then wipe dry. Avoid using harsh chemicals, solvents, or abrasive cleaners.
7.2 Emmagatzematge
Store the calculator in a cool, dry place away from direct sunlight, extreme temperatures, and high humidity. Keep it in its protective case when not in use to prevent scratches and damage.
7.3 Substitució de la bateria
When the display becomes dim or calculations are incorrect, it may be time to replace the battery. Follow the battery installation steps in Section 3.2. Ensure to use the correct battery type (A-type).
8. Solució De Problemes
| Problema | Causa possible | Solució |
|---|---|---|
| La calculadora no s'encén. | Insufficient light for solar power, dead battery, or incorrect battery installation. | Move to a brighter area, replace the battery, or check battery polarity. |
| La pantalla és tènue o difícil de llegir. | Low battery, insufficient light, or contrast setting is too low. | Replace battery, move to brighter area, or adjust display contrast (Section 3.4). |
| "Syntax Error" message appears. | Incorrect mathematical expression input. | Review the entered expression for errors in syntax, such as unmatched parentheses or incorrect function arguments. |
| "Math Error" message appears. | Result exceeds calculation range, division by zero, or invalid input for a function (e.g., square root of a negative number). | Check input values and calculation range. Avoid operations like division by zero. |
8.1 Restablir la calculadora
If the calculator behaves abnormally or freezes, a reset may resolve the issue. Press [MAJÚS] aleshores [9] (CLR), then select 'All' to clear all memory and settings. This will return the calculator to its factory default state.
9. Especificacions
| Característica | Especificació |
|---|---|
| Tipus de producte | Calculadora científica |
| Nom del model | FX-991ARX |
| Color | Negre |
| Tipus de visualització | LCD de matriu de punts completa |
| Mida de la pantalla | 2.51 Centimeters (Visible screen diagonal: 1" / 3 cm) |
| Font d'alimentació | Bateria/Energia solar |
| Tipus de bateria | 1 bateria (inclosa) |
| Material | Plàstic |
| Dimensions del producte (L x A x A) | 16.2 x 7.7 x 1.1 cm |
| Pes de l'article | 170 g |
| Fabricant | Casio |
Figure 9.1: Calculator Dimensions. This image illustrates the approximate dimensions of the Casio FX-991ARX calculator, showing a length of 6.9 inches (17 cm).
10. Garantia i Suport
Per obtenir informació sobre la garantia i l'assistència al client, consulteu la documentació inclosa amb el producte o visiteu el lloc web oficial de Casio. website. Casio provides support for product inquiries, technical assistance, and service requests.
