Operation Guide 3147
8
To turn an alarm and the Hourly Time Signal on and off
1. In the Alarm Mode, use E and B to select an alarm or the Hour ly Time
Signal.
2. When the alarm or the Hour ly Time Signal you want is selected, press C
to toggle it on and off .
ALM Indicates alarm is on.
SIG Indicates Hourly Time Signal is on.
• The alar m on indicator (ALM ) and the Hourly Time Signal on indicator (SIG)
are shown on the displa y in all modes while these functions are turned on.
• If any alarm is on, the alar m on indicator is shown on the displa y in all modes .
Illumination
The display of the watch is illuminated using an
EL (electro-luminescent) panel f or easy reading
in the dark. The watch’ s auto light s witch turns on
illumination automatically when you angle the
watch towards y our f ace.
• The auto light s witch must be turned on
(indicated by the auto light s witch on indicator)
for it to operate .
• See “Illumination Precautions” for other
important information about using illumination.
Auto light s witch
on indicator
To turn on illumination manually
Press L in any mode to illuminate the displa y for about one second.
• The above operation turns on illumination regardless of the current auto
light switch setting.
• Illumination is disabled during time calibration signal reception, and while
configuring sensor measurement mode settings.
About the Auto Light Switc h
T urning on the auto light switch causes illumination to turn on, whenev er you
position your wrist as described below in any mode.
Note that this watch f eatures a “Full A uto EL Light”, so the auto light s witch
operates only when av ailable light is belo w a certain level. It does not
illuminate the display under bright light.
• The auto light switch is alwa ys disab led, regardless of its on/off setting,
when any one of the f ollowing conditions e xists .
While an alarm is sounding
During sensor measurement
While a receive operation is in prog ress in the Receive Mode
Moving the watch to a position that is par allel to the ground and then tilting
it towards you more than 40 deg rees causes illumination to turn on.
• W ear the watch on the outside of y our wrist.
Warning!
• Always make sure y ou are in a safe place whenever y ou are reading
the display of the watc h using the auto light switch. Be especiall y
careful when running or engaged in any other activity that can result
in accident or injury . Also take care that sudden illumination b y the
auto light switch does not startle or distract others ar ound y ou.
Par allel to
ground
More than
40
°
• When you are wearing the watch, make sure that its auto light s witch
is turned off before riding on a bic ycle or operating a motor cycle or
any other motor vehic le. Sudden and unintended operation of the auto
light switch can create a distraction, whic h can result in a traffic
accident and serious personal injury .
To turn the auto light switch on and off
In the Timekeeping Mode , hold down L f or about three seconds to toggle the
auto light switch on (A.EL displa yed) and off (A.EL not display ed).
• The auto light switch on indicator (A.EL ) is on the displa y in all modes while
the auto light switch is turned on.
• The auto light switch turns off automatically whenev er battery power drops
to Lev el 3.
• Illumination may not turn on right awa y if you r aise the watch to your f ace
while a barometric pressure or altitude measurement operation is in
progress.
Question: How does the altimeter work?
Answ er: Generally , air pressure and temperature decrease as altitude
increases. This watch bases its altitude measurements on
International Standard Atmosphere (ISA) values stipulated by the
International Civil Aviation Organization (ICA O). These v alues define
relationships between altitude, air pressure , and temperature .
0 m
500 m
1000 m
1500 m
2000 m
2500 m
3000 m
3500 m
4000 m
899 hPa
795 hPa
701 hPa
616 hPa
8.5°C
2° C
–4.5°C
–1 1°C
15°C1013 hPa
About 6.5° C
per 1000 m
About 8 hPa per 100 m
About 9 hPa per 100 m
About 10 hPa per 100 m
About 1 1 hPa per 100 m
About 12 hPa per 100 m
Altitude Air Pressure T emperature
• Note that the follo wing conditions will prev ent y ou from obtaining accurate
readings:
When air pressure changes because of changes in the weather
Extreme temperature changes
When the watch itself is subjected to strong impact
0 ft
2000 ft
4000 ft
6000 ft
8000 ft
10000 ft
12000 ft
14000 ft
25.84 inHg
22.23 inHg
19.03 inHg
44.7°F
30.5°F
16.2°F
59.0°F29.92 inHg
About 3.6° F
per 1000 ft
About 0.15 inHg per 200 ft
About 0.17 inHg per 200 ft
About 0.192 inHg per 200 ft
About 0.21 inHg per 200 ft
Source: International Civil Aviation Organization
There are two standard methods of e xpressing altitude: Absolute altitude and
relative altitude . Absolute altitude e xpresses an absolute height abo ve sea
le vel. Relative altitude expresses the diff erence between the height of two
different places .
Height of building 130 m
(relative altitude)
Rooftop at an altitude of
230 m abov e sea lev el
(absolute altitude)
Sea Level
Precautions Concerning Simultaneous Measurement of Altitude and
T emperature
Though you can perf orm altitude and temperature measurements at the same
time, y ou should remember that each of these measurements requires
different conditions f or best results . With temperature measurement, it is best
to remov e the watch from y our wrist in order to eliminate the effects of body
heat. In the case of altitude measurement, on the other hand, it is better to
leav e the watch on y our wrist, because doing so keeps the watch at a
constant temperature , which contributes to more accurate altitude
measurements.
• T o give altitude measurement priority , leave the w atch on y our wrist or in
any other location where the temperature of the w atch is kept constant.
• T o give temper ature measurement priority , remove the watch from y our
wrist and allow it to hang freely from your bag or in another location where
it is not exposed to direct sunlight. Note that removing the watch from your
wrist can affect pressure sensor readings momentarily .
Questions & Answers
Question: How does the barometer w ork?
Answer: Barometr ic pressure indicates changes in the atmosphere, and b y
monitoring these changes you can predict the weather with
reasonable accuracy . Rising atmospheric pressure indicates good
weather , while f alling pressure indicates deteriorating weather
conditions.
The barometric pressures that you see in the newspaper and on the
TV weather repor t are measurements corrected to v alues measured
at 0 m sea lev el.
P o wer Supply
This watch is equipped with a solar cell and a special rechargeab le battery
(secondary batter y) that is charged by the electrical power produced b y the
solar cell. The illustr ation shown belo w shows ho w you should position the
watch f or charging.
Example: Orient the watch so its f ace is
pointing at a light source.
• The illustration shows ho w to position a
watch with a resin band.
• Note that charging efficiency drops when
any part of the solar cell is blocked b y
clothing, etc.
• Y ou should tr y to keep the watch outside
of your slee ve as m uch as possible.
Charging is reduced significantly if the
face is cov ered only par tially .
Solar cell