DT820P - Calculator AURORA - Free user manual and instructions

Product Type	Calculator
Brand	Aurora
Model	DT820P
Display	8-digit LCD
Power Source	Solar cell + LR44 battery
Basic Functions	Addition, subtraction, multiplication, division, percent, square root
Memory Functions	M+, M-, MR, MC
Clear Key	Single press: clear entry; double press: clear all
Auto Power Off	After approx. 8 minutes of inactivity
Keyboard	Plastic keys with tactile feedback
Dimensions	150 x 100 x 30 mm
Weight	Approx. 150 g
Color	Black / Dark gray
Housing Material	Plastic
Base	Non-slip rubber feet
Battery Type	LR44 button cell (included)
Battery Life	Approx. 12 months under normal use
Cleaning	Wipe with a soft, dry cloth
Operating Temperature	0°C to 40°C
Storage Temperature	-20°C to 60°C
Certifications	CE, RoHS

Frequently Asked Questions - DT820P AURORA

How do I turn on the calculator?

The calculator turns on automatically when you press any key. It turns off automatically after about 8 minutes of inactivity.

How can I clear the display?

Press the C/CE key once to clear the current entry. Press it twice to clear all calculations and memory.

How do I use the memory functions?

Use M+ to add the displayed number to memory, M- to subtract, MR to recall the stored value, and MC to clear memory.

What type of battery does it use?

It uses a LR44 or equivalent button cell battery.

How do I replace the battery?

Slide open the battery compartment cover on the back, remove the old battery, and insert a new LR44 with the positive side facing up.

Why is the display dim or not working?

A dim display usually indicates a low battery. Replace the battery or ensure the solar cell receives enough light. In adequate light, the calculator can operate on solar power alone.

Can I use the calculator without a battery?

Yes, if there is sufficient ambient light, the solar cell can power the calculator. However, for low-light conditions, the battery is needed.

How can I reset the calculator?

Remove the battery for about 10 seconds to perform a complete reset. This clears all settings and memory.

Is this calculator suitable for advanced calculations?

No, the DT820P is designed for basic arithmetic only: addition, subtraction, multiplication, division, percent, and square root.

Where can I download the user manual?

You can download the user manual for free from the manufacturer's website or from notice-facile.com in PDF format.

USER MANUAL DT820P AURORA

Thank you for purchasing your new Aurora DT820P calculator, please remove and recycle all packaging and carefully remove the printed overlay from the screen of the calculator

Instrucons and FAQ's:

1. Turning your calculator on and o.

Your calculator is equipped with a patented 'direct number input' feature, which allows you to press 'any' key to turn your calculator on, should you press a number key, then this number will also register in the display. The calculator is equipped with an 'auto o' feature and will power down by itself aer a period of inactivity.

2. What are the COST, SELL and MARGIN keys for?

These buons allow you to calculate 'gross prot margin' and your required cost or sell prices. There are 3 variables - Cost, Sell and Margin, if you input two of these variables the calculator will automatically solve the third.

Example 1.

My cost is 30, I will sell for 60 – what gross prot margin am I making?

[Input 3, 0, COST, 6, 0, SELL] – The answer will be displayed as 50%

Example 2.

My cost is 30, I want to make 50% gross prot – what should I sell it for?

[Input 3, 0, COST, 5, 0, MARGIN] – The answer will be displayed as 60

Example 3.

I will sell for 60 and want to make 50% gross prot – what should my cost be?

[Input 6, 0, SELL, 5, 0, MARGIN] – The answer will be displayed as 30

Aer you have solved any third variable you can review all 3 variables by pressing the cost, sell and margin keys again.

3. What are the '+TAX' and '-TAX' keys for?

These buons allow you to add or deduct a user denable percentage at the touch of a buon. A common use for these buons is too add or deduct sales tax.

Firstly you need to set the tax rate.

Example – Seng a tax rate of 19%

[Input 1, 9, RATE, SET] – The SET key is on the same key as '+TAX'.

The tax rate is now set at 19% and will remain in the memory until you change it even when the calculator turns 0. Now you have set you tax rate you can simply add or deduct tax easily by using the '+Tax' and '-Tax' Keys

Example1 – The price is 60 including 19% sales tax, what is the price exclusive of tax?

[Input 6, 0, -TAX] – The answer is displayed as 50.42

Example 2 – The price is 60 excluding 19% sales tax, what is the price including tax?

[Input 6, 0, +TAX] – The answer is displayed as 71.40.

You can also view the actual tax content and the total by pressing the same tax key again.

You can also review the currently programmed Tax rate by pressing 'RATE' and 'RECALL' (the recall key is on the same key as the '-TAX' key) the currently set tax rate will be displayed on the screen.

4. How do the memory keys work?

Your calculator has a memory and you can store a variable number, to store a number press the 'M+' key, you can store a simple number or an answer from a calculaon. The memory also has a running total, so you can add and deduct numbers using the M+ and M- keys. To see the number stored in the memory or the running total press the MRC key once. To clear the memory and reset back to zero press MRC key twice.

Example1 – Store the answers to the simple sums 2+2 and 3+3 in the memory and calculate the total.

[Input 2, +, 2, M+, 3, +, 3, M+] now press the MRC key once, the correct answer of 10 will be displayed.

Example 2 – Use the memory to add these number together 5, -6, 8,9,-4.

[Input 5, M+, -6, M+, 8, M+, 9, M+, -4, M+] – now press MRC once and the correct answer 12 will be displayed. To clear and reset your memory press the MRC key twice. Whenever a number is stored in the memory an 'M' will show on the display.

5. What does the C/CE key do?

CE means clear entry pressing this will remove you last entry but not your whole sum.

C means cancel, pressing the key again will cancel your whole calculaon.

6. What does the ▷ do?

This is the backspace or delete key, pressing this deletes the last digit you entered.

↑5/4↓

7. What is the switch marked for?

This switch is the round up/down switch, there are 3 posions, the rst is marked with the arrow poinng upwards, on this seng the calculator will round all answers up. The middle seng is marked 5/4, on this seng the calculator will use the mathemacal rule of rounding up when above 5 and rounding down when below 5, the 3rd seng marked by the arrow poinng down will round all answers down.

IMPORTANT – the rounding and number of decimal places will be aected by the seng of the decimal place switch see below.

8. What is the switch marked 'A 0 2 4 F' for?

This is the decimal place seng switch. The rst seng 'A' stands for Add mode, here addition and subtracon funcons are performed with an automac 2 digit decimal this is useful when working with currency and it speeds up data entry. i.e. If you enter 1, 0, 0, 0 then press +, you will noce that the display shows 10.00, it assumes when you typed 1,0,0,0 you were entering 10.00 and not 1000.

The second seng '0' xes the decimal place to zero places, all answers will be rounded to zero decimal places based on the seng of your rounding key (see above)

The 3^rd seng is '2', as above all answers will now be rounded to two decimal places.

The 4^th seng is ‘4’, as above all answers will now be rounded to four decimal places.

The 5^th seng is 'F' which stands for oang, you answer will not be shortened and will be displayed using the largest amount of digits the screen permits.

9. How do I change the baery?

On the back of the calculator is a circular baery compartment, use a coin or screwdriver and carefully rotate the cover in an clockwise direcon to unlock. Replace the baery - your calculator requires an LR1130. Replace the cover and carefully ghten.

IMPORTANT – when you change or remove the baery always perform a reset, see below.

10. My calculator is performing strangely and requires reseng.

Locate the reset buon on the back of the calculator – there is a small hole in the case marked 'RESET'. Using a blunt but narrow object (the end of a paperclip or small screwdriver should do) gently depress the reset buon. This should reset your calculator and will solve many potential problems.

11. My calculator has stopped working – what should I do?

Firstly you try a Reset (see above), if you suspect the baery has failed then you should replace this (see above). If you believe your calculator is faulty and you purchased it less than 1 year ago then it is covered by a manufacturer's warranty. Please contact your supplier for details.

Aurora disclaims any liability for incidental or consequential damages aributable to the product. The liability of Aurora is limited to the cost of the repair/replacement of the unit under warranty.