G-Shock DWG-100UJ-9JR - Manual (Page 5)

2059-5
About the Photosensor
The pulse measurement system of this watch employs a highly sensitive
photosensor that detects how much infrared light is absorbed by
hemoglobin in the blood as it passes through the capillaries at your
fingertip. Changes in the relative infrared light intensity detected by the
photosensor are converted into pulse values.
1 A light emitting diode outputs infrared light.
2 The photosensor detects changes in how
much of the infrared light is reflected and
how much passes through the finger.
• The above process requires that your finger
is placed on the photosensor correctly and
that certain measurement conditions are
met. Otherwise, correct measurements may
be impossible.
Photosensor
Hemoglobin Light
• The backlight may not light if the face of the
watch is more than 15 degrees above or
below parallel. Make sure that the back of
your hand is parallel to the ground.
•
The backlight turns off in about two
seconds, even if you keep the watch
pointed towards your face.
• Static electricity or magnetic force can interfere with proper operation
of the auto light switch. If the backlight does not light, try moving the
watch back to the starting position (parallel with the ground) and then
tilt it back toward you again. If this does not work, drop your arm all the
way down so it hangs at your side, and then bring it back up again.
•
Under certain conditions the backlight may not light until about one
second after you turn the face of the watch towards you. This does not
necessarily indicate malfunction of the backlight.
• In order to protect against running down the battery, the auto light switch
is automatically turned off approximately 24 hours after you turn it on.
Backlight Precautions
• The backlight remains lit for about two seconds from the point you
press
L , even if it is already lit when you press L . If you keep
depressed for five seconds, the backlight will automatically turn off.
• The electro-luminescent (EL) panel loses illuminating power after very
long use.
• The illumination provided by the backlight may be hard to see when
viewed under direct sunlight.
• The watch will emit an audible sound whenever the display is
illuminated. It does not indicate malfunction of the watch.
•
The backlight automatically turns off whenever an alarm sounds.
Auto light switch precautions
•
Avoid wearing the watch on the inside of your wrist. Doing so causes
the auto light switch to operate when it is not needed, which shortens
battery life. If you want to wear the watch on the inside of your wrist,
turn off the auto light switch feature.
More than 15 degrees
too above
To calibrate the temperature
1. In the Timekeeping Mode, press B to
display the Temperature screen.
2. Hold down A until the temperature value
start to flash.
3. Each press of B increases the displayed
temperature by 0.1
°
C while pressing L
decreases it.
• Pressing B and L at the same time
returns to the factory calibration.
4. Press A to return to the Temperature
screen.
• The watch may not be able to correctly judge the current light level
while it is being exposed to infrared light.
Calibrating the Temperature Sensor
The temperature sensor of this watch is calibrated at the factory before
shipment and further adjustment is normally not required. If you notice
serious errors in the temperature readings produced by the watch, you
can calibrate the sensor to correct the errors.
Important!
Incorrectly calibrating the temperature sensor can result in incorrect
readings. Carefully read the following before doing anything.
• Compare the readings produced by the watch with those of another
reliable and accurate thermometer.
• If adjustment is required, remove the watch from your wrist and wait for
20 or 30 minutes to give the temperature of the watch time to stabilize.
• You can adjust the temperature within the range of –20.0 to 60.0 ° C, within
± 9.9 ° C of the current temperature reading (produced by the factory
default temperature adjustment setting).