Scientific Calculators: FAQs

Here are links to frequently asked questions. For your convenience, these questions have been divided into two categories. General Questions deals with questions concerning scientific calculators in general while Questions Concerning Operation answers questions related specifically to operating our calculators.

Questions Concerning Operation
Why does the display automatically turn off?
To reduce battery consumption, most scientific calculators are equipped with an auto power off function. If the keypad is not touched for about 10 minutes the scientific calculator automatically shuts itself off.
What does Twin Power mean?
Twin Power means that the calculator is powered by two different power sources to reduce battery consumption. When there is enough light, the calculator draws power through its solar cell battery. When the calculator is in low light conditions, the normal batteries are used.
The graph display is hard to see.
Try adjusting the contrast level. A poor display can also indicate a low battery level.
How can I turn the power off? What does 2ndF mean?
The keys of scientific calculators have several functions. The second function of each key is commonly highlighted in orange above the key. To access the second function of any key, first press the 2ndF key, followed by the key whose second function you wish to activate. To turn the power off, first press the 2ndF key, followed by the key with the highlighted OFF function (usually the ON key).
No keys react. How can I clear the display, and start over?
Scientific calculators have complicated settings and modes, and you must push the appropriate key to proceed to the next step. To start from the default setting, push the reset key at the back (it's located inside the battery cover for the EL-9950 and EL-9900). Bear in mind that by using the reset key, you'll lose everything in memory as well as your programmes.
When I calculate , I can't get the answer 3. Why does this happen? How can I get the right answer?
You must first calculate what's inside the square root using the parentheses '( )' keys. Otherwise you are calculating + 3.
(Operation guide) [] [(] [6] [+] [3] [)] [=]
I can't get 0.5 from sin30. Why does this happen?
Scientific calculators display angular values in either DEG, RAD, or GRAD. Use the DRG key to select the mode you want (it will be shown at the top of the display). DEG mode will give you sin30=0.5.
How can I get further information on this model?
How can I use the unique functions of this model?

The Guide Books section in the Educational Support part of this web site has operation guides available for download. Key operations can be learnt through examples in these guides. Click here to be taken to the page.
Can I enlarge the memory capacity of the graphing calculator?
No, but with its PC-Link, you can save and backup your data on your computer.
Can I keep the content of the memory when changing the batteries of the graphing calculator?
Yes. It has a battery for backup, to keep your memory's content secure.
Can I print the display and data of the graphing calculator?
It is not possible to print directly, but information uploaded to your computer via the PC-Link can be printed.
Can I e-mail data and displays made on the graphing calculator?
Yes. Upload your data to your computer via the PC-Link and send them as e-mail attachments.