Sharp QS-2130 - Manual (Page 9)

8
POWER SUPPLY
This calculator has a solar cell and is energized by electrical energy produced by the solar cell. The
solar cell converts luminous energy directly into electrical energy by utilizing the photovoltaic effect.
Brightness for operation
If the light exposed to the solar cell is insufficient, the calculator is not powered to operate.
With the brightness criterion below, operate the calculator at 150 Iux or more.
Outdoors or by the window: Incandescent lamp: Fluorescent lamp:
Backup Battery
If the light exposed to the solar cell is insufficient (150 Iux or lower), the backup battery is turned on
automatically to operate the calculator.
Use the calculator where it is
not exposed to direct sunlight
but receives enough illumi-
nation for comfortable read-
ing. Use the calculator wherever it
receives the same illumi-
nation as attained within 2.5
meters of a 100 Watts in-
candescent lamp. Use the calculator wherever
it receives the same illumi-
nation as attained within 1.5
meters of a 15 Watts fluores-
cent lamp.