Display Brightness and Battery LifeDisplay Brightness

The display brightness of your ClassPad is adjustable. The initial default brightness setting after purchase is “Medium”. Display brightness will dim automatically if you do not perform any operation for about 30 seconds. Performing an operation will cause display brightness to return to normal.

For details about how to configure the display brightness setting, see “Chapter 14: System Application”.

Battery Life

Battery life is affected by the display brightness and backlight duration settings. Battery life is also affected by how the ClassPad is used. Using a program to execute a long series of calculations, for example, will shorten battery life.

ClassPad OperationDisplay BrightnessBatteriesApproximate
Battery Life*1

 

 

 

Repeat of following three-step cycle

Display brightness settings during

 

 

each hour.

each of the three steps described

Alkaline

100 hours

 

to the left.

(1) Application Menu display for 5

(1) Initially “Medium”, dimmed after

 

 

minutes

30 seconds

 

 

Nickel-metal

 

(2) Program application calculation

(2) “Medium”

 

for 5 minutes

 

hydride

60 hours

(3) Program application display for

(3) Same as (1), above.

(recommended

 

type only)

 

50 minutes

 

 

 

 

 

 

 

 

 

*1 New alkaline batteries or fully-charged new nickel-metal hydride batteries, in an ambient temperature of 25°C. Battery life values are approximate and are intended for reference only.

Specifications

Calculation range: ±1 × 10−999 to ±9.999999999 × 10999 and 0.

Internal operations use 15-digit mantissa in the case of calculations that do not use algebraic methods (calculations with Newton’s Method, for example)

Maximum allowable range for rounding of calculation results: −9.5999 < x < −9.5−308, 1.0−308 < x < 9.5999

Exponential display range: Normal 1: 10−2 > x, xt 1010, Normal 2: 10−9 > x, xt 1010

Program capacity: 515,000 bytes (max.)

Storage memory capacity: 5.5 MB (max.) for the eActivity area 24 MB (max.) for the storage area

Power supply: Four AAA-size batteries LR03 (AM4), or four nickel-metal hydride batteries

Power consumption: 1.0 WApproximate battery life:

Battery life values shown below are based on use of new alkaline batteries or fully-charged new nickel- metal hydride batteries, in an ambient temperature of 25°C, and depend on the operating conditions ((a), (b), or (c)).

(a)Continuous display in the Program application, each hour starting with “Medium” display brightness, dimmed automatically after 30 seconds

Appendix 272