SPECIFICATIONS
2/8
Cal. V157A/V158A
FEATURES
The Cal. V57A/V58A are analogue watches with a solar power generation system.
l
Solar power generation system
The watch operates while charging electricity by converting light received on the dial to
electrical energy. It lasts for 0 months after full charge.
l
Energy depletion forewarning function
When the energy stored in the rechargeable battery is reduced to an extremely low level, the
second hand starts moving at 2-second intervals instead of the normal -second intervals.
l
Instant-start function
When the watch is exposed to sunlight or strong artificial light (of more than ,000 lux), it will
start operating immediately with the second hand moving at 2-second intervals.
l
Guideline of charging time
Environment/Light source
Illumination
(lux)
Time required
for full charge
Time required
for steady
operation
Time to charge
day of power
General offices/ Fluorescent
Light
700
-
25 hours
0 minutes
30W 20cm/Fluorescent light
3,000
20 hours
6 hours
30 minutes
30W 3cm/ Fluorescent light
0,000
35 hours
2 hours
0 minutes
Cloudy weather/Sunlight
0,000
35 hours
2 hours
0 minutes
Fair weather/Sunlight
00,000
9 hours
0.4 hours
2 minutes
The above table provides only a general guideline.
It is recommended that the watch be charged for as long as the charging time according to the
column "Time required for steady operation" in this table in order to assure the stable movement
of the watch.
l
Caution for charging
When charging the watch, do not place it too close to a photo flash light, spotlight, incandescent
light or other light sources as the watch temperature will become extremely high, causing damage
to the parts inside the watch.
When exposing the watch to sunlight to charge it, do not leave it on the dashboard of a car, etc.
for a long time, as the watch temperature becomes extremely high.
While charging the watch, make sure the watch temperature does not exceed 60 °C.
V58A is a caliber which improved standard accuracy and power reserve from V45A, and also
available to be used for diver's watch.
V57A is a same caliber as V58A, but without a day calendar mechanism.
