Using the Backlight
2 Using the Backlight
Your calculator is equipped with a backlight for easy reading, even in the dark. You can conserve battery power by limiting backlight operation to only when you need it.
uTo turn on the backlight
•Press ](LIGHT) to turn on the backlight.
•Backlight duration
The backlight turns off automatically if you do not perform any key operation for a preset amount of time (30 seconds or 10 seconds).
•If you perform a key operation, the backlight duration will be extended for the applicable preset amount of time (30 seconds or 10 seconds).
•See “To specify the backlight duration” (page
•Backlight and Battery Life
•Frequent use of the backlight will shorten battery life.
•The following are guidelines that show how battery life is affected by backlight use. It is based on a new set of alkaline batteries at a temperature of 25°C.
Backlight Use | Approximate Battery Life | |
5 minutes calculation, 55 minutes display per hour; | 140 hours | |
no backlight use | ||
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5 minutes calculation, 55 minutes display, 3 minutes | 130 hours | |
backlight operation per hour | ||
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5 minutes calculation, 55 minutes display, 15 minutes | 100 hours | |
backlight operation per hour | ||
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5 minutes calculation, 55 minutes display per hour; | 50 hours | |
continuous backlight use | ||
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