2. OPERATION CHART : QW-1680
GENERAL GUIDE
Y Press to change from mode to mode.
Y 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.
Timekeeping Mode
Month-day displayCurrent TemperatureCountdownStopwatch ModeTemperature DataAlarm Mode
DisplayAlarm ModeRecall Mode
Press
Press
TIMEKEEPING MODESwitching between Celsius and Fahrenheit
1.Hold down while in the Current Temperature
MonthYou can select display of either the current dateDay ofDay(month and day) or temperature in the Timekeeping
Display and the current temperature digits flash.
2.Press to select either Celsius OuC� or
weekMode. Press to toggle between the date andFahrenheit OuF�.
temperature display.3.After you select the Celsius or Fahrenheit, press
to return to the Temperature Display.
To set the time and date
1.While the current date (not the temperature) isFlashes
displayed in the Timekeeping Mode, hold down
until the seconds digits flash on the display.Y If you do not operate any button for a few minutes while a selection is flashing, the
2.Press to change the selection (flashing) in theflashing stops and the watch goes back to the Current Temperature Display
following sequence.automatically.
Hour Seconds12/24-HourCalibrating the Temperature MeasurementSecondsHourMinutes
DayMonthYearFormat PM MinutesThe temperature sensor of this watch is calibrated at the factory before shipment and
indicator
3.While the seconds setting is selected (flashing),further adjustment is normally not required. If noticeable error is found in the
press to reset it to 00. If you press while thetemperature readings produced by the watch, you can adjust it to correct the error.
seconds setting is in the range of 30 to 59, the
Important
seconds are reset to 00 and 1 is added to the
Incorrectly calibrating the temperature measurement of this watch can result in
minutes. If the seconds setting is in the range of
incorrect readings. Carefully read the following before doing anything.
00 to 29, the minutes count is unchanged.Y Compare the readings produced by the watch with those of another reliable,
4.While any other setting (besides seconds) is selected (flashing), press toaccurate thermometer.
increase it or to decrease it. While the 12/24-hour format setting is selected,Y If calibration is required, remove the watch from your wrist and wait for 20 or 30
press to toggle it between 12 and 24.minutes to give the temperature of the watch time to stabilize.
Y Except for the seconds or 12/24-hour setting, holding down a button changes theY Perform the temperature calibration before procedure as quickly as possible to avoid
setting at high speed.the temperature of the watch being affected by your body temperature.
5.After you set the time and date, press to return to the Timekeeping Mode.Y You can also perform temperature calibration underwater, if the water temperature is
Y The day of the week is automatically set in accordance with the date.
stable.
Y The date can be set within the range of January 1, 1995 to December 31, 2039.
Y If you do not operate any button for a few minutes while a setting is flashing, theTo calibrate the temperature
flashing stops and the watch goes back to the Timekeeping Mode automatically.1.Hold down while in the Current Temperature
Display and the current temperature digits flash.
Current Temperature Display2.Each press of increase the displayed
A built-in temperature sensor measures temperature and shows the measured value
temperature by 0.1uC, and pressing the
on the display. The readout from the temperature sensor can also be switched
decrease it by 0.1uC.
between Celsius (uC) and Fahrenheit (uF). The thermometer can be calibrated to
Y If you have selected Fahrenheit as your unit of
correct for errors.measurement, the above operations change the
reading by 0.2uF.
ImportantY You can calibrate the temperature within a range
Temperature measurements are affected by your body temperature (while you are
of �9.9uC to +9.9uC (�18.0uF to +18.0uF).
wearing the watch), direct sunlight, and moisture. To achieve a more accurate
FlashesY Press and at the same time to reset the
temperature measurement, remove the watch from your wrist, place it in a well
temperature calibration to the factory setting.
ventilated location out of direct sunlight, and wipe off all moisture from the case. It
3.After calibrating the temperature, press to
takes approximately 20 to 30 minutes for the case of the watch to reach the actual
return to the Current Temperature Display.
surrounding temperature.Y If you do not operate any button for a few minutes
while a selection is flashing, the flashing stops and
Accurate temperature measurements cannot be achieved while you are wearing the
the watch goes back to the Current Temperature
watch. The following graph illustrated affects of body temperature on actual
Display automatically.
temperature.
40u
C
30u
C
ABOUT THE BACKLIGHT
20u
C
TemperatureY Pressing (Timekeeping Mode, Temperature Data Recall Mode, Alarm Mode) or
(Countdown Alarm Mode, Stopwatch Mode) illuminates the display for about two
Approximate
10u
Cseconds.
Y The backlight of the watch employs an electro-luminescent (EL) light, which loses
Differences caused byilluminating power after very long use.
0u
Cindividual body
Y The illumination provided by the backlight may be hard to see when viewed under
temperture or clothingdirect sunlight.
Y The watch will emit an audible sound whenever the display is illuminated. This is
10u
C 20u
C 30u
C40u
Ccaused by a transformer that vibrates when the EL panel lights up. It does not
Temperature measured when watch is worn on wristindicate malfunction of the watch.
Y The backlight automatically turns off whenever an alarm sounds.
About Temperature Measurement
TemperatureCurrentYA temperature measurement operation isperformed whenever you switch from month-day
graphtemperaturedisplay to temperature display.COUNTDOWN ALARM MODE
Y Temperature measurements are performed and
the temperature value is updated every two
Mode1/10The countdown alarm can be set within a range of 1
minutes while the current temperature is
indicatorsecondssecond to 24 hours. When the countdown reaches
displayed.zero, an alarm sounds for 10 seconds or until you
Y Pressing while the current temperature ispress any button.
displayed executes a temperature measurement
operation and stores the result in memory along
To set the countdown start time
with the time of the measurement.1.Hold down while in the Countdown Alarm
Y At the top of each hour, the current temperatureMode. The hour digits flash on the display
is measured and stored in memory along with
because they are selected.
the time of the measurement.2.Press to change the selection in the following
sequence.
The display shows O� � . � uC (or uF)� if a measured value falls outside the range of
�20uC to 60uC (�4uF to 140uF). The normal display will return as soon as the
HourMinutesSeconds
temperature returns within the allowable range.Hours Seconds
Y Memory can hold up to 100 temperature data entries, which are managed on a first-Minutes3.Press to increase the selected number or
in, first-out basis. See OTEMPERATURE DATA RECALL MODE� of this manual for
to decrease it. Holding down either button
details on how to recall memory data.changes the selection at high speed.
Y The first data item is stored as data item 1, the second as data item 2, and so on upY To set the starting value of the countdown time to 24 hours, set 0:00'00".
to 100 data items.4.After you set the countdown start time, press to return to the Countdown Alarm
Y When a new data item is stored while there are already 100 data items (numbered 1Mode.
to 100) in memory, the new data item is Opushed� into memory from the top (on top of
Y If you do not operate any button for a few minutes while a selection is flashing, the
item 100). This shifts all of the previous data items down one position (item 100
flashing stops and the watch goes back to the Countdown Alarm Mode
becomes item 99, 99 becomes 98, and so on), and item 1 is deleted.automatically.
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ACEC
CASIO
