Deli ED991ES Scientific Calculator User Manual

1. Inleiding

The Deli ED991ES is a scientific calculator designed for students and professionals, offering 417 functions for a wide range of mathematical and scientific calculations. It features a clear LCD display, rubber buttons for comfortable operation, and a protective sliding cover. This calculator is powered by both batteries and solar energy, ensuring reliable performance.

2. Opstelling

2.1 Battery installasie

The Deli ED991ES calculator requires two AA batteries for operation. It also features a solar panel for supplementary power, extending battery life.

1. Vind die batteryklepdeksel aan die agterkant van die sakrekenaar.
2. Skuif die deksel af in die rigting wat deur die pyl aangedui word.
3. Insert two AA batteries, ensuring correct polarity (+/-) as marked inside the compartment.
4. Plaas die batteryklepdeksel terug totdat dit stewig vasklik.

Let wel: The calculator utilizes a dual power system (battery and solar). Ensure sufficient light for solar power to function effectively.

2.2 Krag aan/af

To turn the calculator on, press the [AAN] button. To turn it off, press [SHIFT] gevolg deur [AF].

Image 1: The Deli ED991ES Scientific Calculator with its protective sliding cover. This image shows the overall design and key layout.

3. Bedryfsinstruksies

The Deli ED991ES offers 417 functions and 8 calculation modes to support various mathematical and scientific tasks. The clear LCD display shows inputs and results effectively.

3.1 Basiese bewerkings

Perform standard arithmetic operations using the number keys and operators ([+], [-], [×], [÷]). Druk [=] to get the result.

3.2 Funksiemodusse

To access different calculation modes, press the [MODE SETUP] button and select the desired mode from the menu. Available modes include:

• COMP: Basic arithmetic and functional calculations.
• STAT: Statistical calculations, including standard deviation.
• TABEL: Generate number tables from functions.
• EQN: Equation solving.
• MATRIEKS: Matrix calculations.
• VEKTOR: Vector calculations.
• BASE-N: Base-N calculations.
• CMPLX: Complex number calculations.

3.3 Sleutelfunksies

The calculator includes dedicated keys for various functions:

• Trigonometriese funksies: [sin], [cos], [tan] and their inverse functions (accessed via [SHIFT]).
• Logarithmic Functions: [log], [ln].
• Krag- en wortelfunksies: [x²], [√], [xʸ].
• Geheue funksies: [STO] (Store), [RCL] (Recall), [M+] (Memory Plus).
• Breukberekeninge: Use the fraction key to input and calculate fractions.
• Constants and Conversions: Access scientific constants and unit conversions via [SHIFT] or [ALFA].

Image 2: The calculator displaying a numerical result, demonstrating its clear screen and button layout during operation.

Image 3: A user's hand interacting with the calculator, highlighting the ergonomic design of the rubber buttons.

Image 4: The calculator positioned on a worksheet, illustrating its practical use in an academic setting.

4. Onderhoud

4.1 Skoonmaak

To clean the calculator, wipe it gently with a soft, dry cloth. Do not use abrasive cleaners, solvents, or spray directly onto the device, as this may damage the display or internal components.

4.2 Berging

When not in use, always keep the protective sliding cover on the calculator to prevent dust, scratches, and accidental button presses. Store the calculator in a cool, dry place away from direct sunlight and extreme temperatures.

5. Probleemoplossing

• Sakrekenaar skakel nie aan nie: Check if the batteries are correctly installed and have sufficient charge. Ensure there is adequate light for the solar panel if operating in low light conditions.
• Incorrect results: Verify that the calculator is in the correct mode (e.g., DEG/RAD for angles, COMP for basic calculations). Clear previous calculations by pressing [AC].
• Skerm is dof of leeg: Replace the batteries. Ensure the solar panel is exposed to light.
• Knoppies reageer nie: Ensure no debris is lodged under the buttons. If the issue persists, try removing and reinserting the batteries to reset the device.

6. Spesifikasies

7. Waarborg en Ondersteuning

Vir waarborginligting of tegniese ondersteuning, verwys asseblief na die dokumentasie wat tydens aankoop verskaf is of kontak u kleinhandelaar. Bewaar u aankoopbewys as bewys van aankoop.