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2. OPERATION CHART : QW-1680
GENERAL GUIDE
• Press to change from mode to mode.
• In the Timekeeping Mode, Temperature Data Recall Mode and Alarm Mode, press to illuminate the display for about two seconds. In the Countdown Alarm Mode and Stopwatch Mode,
press to illuminate the display for about two seconds.
Alarm ModeStopwatch Mode
Press
Press
Timekeeping Mode
Temperature Data
Recall Mode
Countdown
Alarm Mode
Current Temperature
Display
Month-day display
TIMEKEEPING MODE
You can select display of either the current date
(month and day) or temperature in the Timekeeping
Mode. Press to toggle between the date and
temperature display.
To set the time and date
1.While the current date (not the temperature) is
displayed in the Timekeeping Mode, hold down
until the seconds digits flash on the display.
2. Press to change the selection (flashing) in the
following sequence.
3.While the seconds setting is selected (flashing),
press to reset it to 00. If you press while the
seconds setting is in the range of 30 to 59, the
seconds are reset to 00 and 1 is added to the
minutes. If the seconds setting is in the range of
00 to 29, the minutes count is unchanged.
4.While any other setting (besides seconds) is selected (flashing), press to
increase it or to decrease it. While the 12/24-hour format setting is selected,
press to toggle it between 12 and 24.
• Except for the seconds or 12/24-hour setting, holding down a button changes the
setting at high speed.
5.After you set the time and date, press to return to the Timekeeping Mode.
• The day of the week is automatically set in accordance with the date.
• The date can be set within the range of January 1, 1995 to December 31, 2039.
• If you do not operate any button for a few minutes while a setting is flashing, the
flashing stops and the watch goes back to the Timekeeping Mode automatically.
Current Temperature Display
A built-in temperature sensor measures temperature and shows the measured value
on the display. The readout from the temperature sensor can also be switched
between Celsius (˚C) and Fahrenheit (˚F). The thermometer can be calibrated to
correct for errors.
Important
Temperature measurements are affected by your body temperature (while you are
wearing the watch), direct sunlight, and moisture. To achieve a more accurate
temperature measurement, remove the watch from your wrist, place it in a well
ventilated location out of direct sunlight, and wipe off all moisture from the case. It
takes approximately 20 to 30 minutes for the case of the watch to reach the actual
surrounding temperature.
Accurate temperature measurements cannot be achieved while you are wearing the
watch. The following graph illustrated affects of body temperature on actual
temperature.
Temperature
Temperature measured when watch is worn on wrist
40˚C
30˚C
20˚C
10˚C
0˚C
10˚C
40˚C
20˚C 30˚C
Approximate
Differences caused by
individual body
temperture or clothing
About Temperature Measurement
• A temperature measurement operation is
performed whenever you switch from month-day
display to temperature display.
• Temperature measurements are performed and
the temperature value is updated every two
minutes while the current temperature is
displayed.
• Pressing while the current temperature is
displayed executes a temperature measurement
operation and stores the result in memory along
with the time of the measurement.
• At the top of each hour, the current temperature
is measured and stored in memory along with
the time of the measurement.
The display shows “– – . – ˚C (or ˚F)” if a measured value falls outside the range of
–20˚C to 60˚C (–4˚F to 140˚F). The normal display will return as soon as the
temperature returns within the allowable range.
• Memory can hold up to 100 temperature data entries, which are managed on a first-
in, first-out basis. See “TEMPERATURE DATA RECALL MODE” of this manual for
details on how to recall memory data.
• The first data item is stored as data item 1, the second as data item 2, and so on up
to 100 data items.
• When a new data item is stored while there are already 100 data items (numbered 1
to 100) in memory, the new data item is “pushed” into memory from the top (on top of
item 100). This shifts all of the previous data items down one position (item 100
becomes item 99, 99 becomes 98, and so on), and item 1 is deleted.
Current
temperature
Temperature
graph
Switching between Celsius and Fahrenheit
1.Hold down while in the Current Temperature
Display and the current temperature digits flash.
2.Press to select either Celsius “˚C” or
Fahrenheit “˚F”.
3.After you select the Celsius or Fahrenheit, press
to return to the Temperature Display.
• If you do not operate any button for a few minutes while a selection is flashing, the
flashing stops and the watch goes back to the Current Temperature Display
automatically.
Calibrating the Temperature Measurement
The temperature sensor of this watch is calibrated at the factory before shipment and
further adjustment is normally not required. If noticeable error is found in the
temperature readings produced by the watch, you can adjust it to correct the error.
Important
Incorrectly calibrating the temperature measurement of this watch can result in
incorrect readings. Carefully read the following before doing anything.
• Compare the readings produced by the watch with those of another reliable,
accurate thermometer.
• If calibration 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.
• Perform the temperature calibration before procedure as quickly as possible to avoid
the temperature of the watch being affected by your body temperature.
• You can also perform temperature calibration underwater, if the water temperature is
stable.
To calibrate the temperature
1.Hold down while in the Current Temperature
Display and the current temperature digits flash.
2.Each press of increase the displayed
temperature by 0.1˚C, and pressing the
decrease it by 0.1˚C.
• If you have selected Fahrenheit as your unit of
measurement, the above operations change the
reading by 0.2˚F.
• You can calibrate the temperature within a range
of –9.9˚C to +9.9˚C (–18.0˚F to +18.0˚F).
• Press and at the same time to reset the
temperature calibration to the factory setting.
3.After calibrating the temperature, press to
return to the Current Temperature Display.
• If you do not operate any button for a few minutes
while a selection is flashing, the flashing stops and
the watch goes back to the Current Temperature
Display automatically.
ABOUT THE BACKLIGHT
• Pressing (Timekeeping Mode, Temperature Data Recall Mode, Alarm Mode) or
(Countdown Alarm Mode, Stopwatch Mode) illuminates the display for about two
seconds.
• The backlight of the watch employs an electro-luminescent (EL) light, which 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. This is
caused by a transformer that vibrates when the EL panel lights up. It does not
indicate malfunction of the watch.
• The backlight automatically turns off whenever an alarm sounds.
COUNTDOWN ALARM MODE
The countdown alarm can be set within a range of 1
second to 24 hours. When the countdown reaches
zero, an alarm sounds for 10 seconds or until you
press any button.
To set the countdown start time
1.Hold down while in the Countdown Alarm
Mode. The hour digits flash on the display
because they are selected.
2.Press to change the selection in the following
sequence.
3.Press to increase the selected number or
to decrease it. Holding down either button
changes the selection at high speed.
• To set the starting value of the countdown time to 24 hours, set 0:00'00".
4.After you set the countdown start time, press to return to the Countdown Alarm
Mode.
• If you do not operate any button for a few minutes while a selection is flashing, the
flashing stops and the watch goes back to the Countdown Alarm Mode
automatically.
Day
Minutes
PM
indicator
Day of
week
Hour
Seconds
Month
Seconds Hour Minutes
12/24-Hour
Format
Day YearMonth
Flashes
Flashes
Hour SecondsMinutes
Mode
indicator
1/10
seconds
Hours
Seconds
Minutes