Citizen F910 Specifications download pdf (Page 3)

2. For Proper Power Generation

[Power Generation Mechanism]

When this watch is worn on the wrist, body

heat from contact with the skin will heat

up the back cover of the watch. This heat

will be released into the air from the sur-

face of the watch, and the temperature dif-

ference between the back cover and the

watch surface will drive a thermoelectric

generation device that generates electric

energy. Power generation performance

varies considerably depending on air temperature, individual differences in body

temperature and the manner in which the watch is worn. The standard usage

environment of this watch is defined as wearing the watch so that the back over

is in direct contact with the wrist at an air temperature of about 25˚C (77˚F) and

body temperature (surface temperature on the wrist) of 32˚C (89.6˚F).

Power generation performance increases as the temperature difference between

the back over and watch surface becomes larger, and decreases as the tem-

perature difference becomes smaller. Power is no longer generated when the

surface temperature of the watch and the temperature of the back cover are

equal or when the surface temperature exceeds that of the back cover. The watch

is unable to generate sufficient power if the surface of the watch is covered with

clothing or other objects. It is recommended to wear the watch so as to release

the heat of the watch surface as much as possible.

[Distinguishing Between Power Generating and Non-Power Generating

Modes]

When power generation has stopped as a result of removing the watch from the

wrist, the second hand moves at 10-second intervals indicating that power is not

being generated. When power generation is resumed by putting the watch on

your wrist or warming the back cover with your fingers, the second hand returns

to 1-second interval movement.

Eco-Dorive Thermo

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Citizen F910 Specifications Page 3