Casio 1645 Owner's Manual

2. OPERATION CHART : QW-1645

C C

• In any mode (except when making settings) press to illuminate the display for about two seconds.

Timekeeping Mode

TIMEKEEPING MODE

Temperature graph

Day of week

Minutes

indicator

Hour

Seconds

4. While any other digits (beside seconds) are selected (flashing), press to increase the number or to decrease it. While the day of the week is selected, press D to advance to the next day and to move back. While the 12/24-hour format setting is selected, press to toggle it between 12 and 24.

• Except for when adjusting the seconds or setting the 12/24-hour format, holding

down a button changes the current selection at high speed.

• When the 12-hour format is selected, the indicator A appears on the display to

indicate “A.M.” times or indicator P appears on the display to indicate “P.M.” times. Selecting the 24-hour format causes the indicator 24 to appear on the display.

5.After you set the time and date, press to return to the Timekeeping Mode.

• 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 selection is flashing, the

flashing stops and the watch goes back to the Timekeeping Mode automatically.

To set the time and date

1. Hold down while in the Timekeeping Mode

Month and Date

until the seconds digits flash on the display be- cause they are selected.

2.Press to change the selection in the following sequence.

Seconds Hour Minutes

Day of

3.While the seconds digits are selected (flashing), press to reset the seconds to 00. If you press

while the seconds count is in the range of 30 to 59, the seconds are reset to 00 and 1 is add- ed to the minutes. If the seconds count is in the range of 00 to 29, the minutes count is un- changed.

ABOUT THE BACKLIGHT

About the Auto Backlight Function

When the auto backlight function is turned on, the backlight automatically turns on for two seconds under the conditions described below. Avoid wearing the watch on the inside of your wrist. Doing so causes the auto backlight to operate when not needed, which shortens battery life.

Moving the watch to a position that is parallel to the ground and then tilting it towards you approximately 40 degrees causes the backlight to illuminate.

Parallel to ground

• The backlight may not illuminate if the face of the watch is more than 15 degrees off parallel to the left or right. Make sure that the back of your hand is parallel to the ground.

Parallel to ground

• Static electricity or magnetic force can interfere with proper operation of the auto backlight function. If the auto backlight does not illuminate, 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 or less after turn the face of the watch towards you. This does not necessarily indicate malfunction of the backlight.

More than 15 degrees

too high

week

Thermometer Mode Countdown Alarm Mode Alarm Mode

To switch the auto backlight function on and off

In the Timekeeping Mode, hold down to turn the auto backlight function on and off.

Auto backlight indicator

12/24-Hour Format

MonthDate

Year

• The auto backlight indicator is shown on the display in all modes while the auto backlight function is on.

• In order to protect against running down the battery, the auto backlight function is automatically turned off approximately three hours after you turn it on. Repeat the above procedure to turn the auto backlight function back on if you want.

• Pressing at any time illuminates the display for about two seconds, regardless of the auto backlight's on/off setting.

Caution

• The backlight of this watch employs an electro-luminescent (EL) light, which loses its illuminating power after very long term use.

• Frequent use of the backligfht shortens the battery life.

• The watch emits an audible sound whenever the display is illuminated. This is because the EL light vibrates slightly when lit. It does not indicate malfunction of the watch.

Warning!

• Never try to read your watch when mountain climbing or hiking in areas that are dark or in areas with poor footing. Doing so is dangerous and can result in serious personal injury.

• Never try to read your watch when running on a roadside or in any other location where there might be vehicular or pedestrian traffic. Doing so is dan- gerous and can result in serious personal injury.

• Never try to read your watch when riding on a bicycle or when operating a motorcycle or any other motor vehicle. Doing so is dangerous and can result in a traffic accident and serious personal injury.

• When you are wearing the watch, make sure that its auto backlight function is turned off before riding on a bicycle or operating a motorcycle or any other motor vehicle. Sudden and unintended operation of the auto backlight can create a distrac- tion, which can result in a traffic accident and serious personal injury.

THERMOMETER MODE

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 be- tween Celsius ( C) and Fahrenheit ( F). The thermometer can be calibrated to correct for errors.

Important

More than 15 degrees

too low

Temperature measurements are affected by your body temperature (while you are wearing the watch), direct sunlight, and moisture. To achieve a more accurate tem- perature 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 ap- proximately 20 to 30 minutes for the case of the watch to reach the actual surround- ing 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

40 C

30 C

20 C

10 C

Temperature measured when watch is worn on wrist

• Press to change from mode to mode. After you perform an operation in any mode, pressing returns to the Timekeeping Mode.

GENERAL GUIDE

Holding down

10 C 20 C 30 C

OFF

Approximate Differences caused

by individual body temperature or

40 C

clothing

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About Temperature Measurement

• A temperature graph which is automatically updated every five minutes, is shown on the display in all modes (except when making settings). Measured temperature values can be viewed in the Thermometer Mode only.

• Pressing while in the Thermometer Mode performs temperature measurement and causes the measured value to appear on the display.

Temperature graph

Mode indicator

Current temperature

Switching between Celsius and Fahrenheit

Flashes

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 incor- rect 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 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

Flashes

* The display shows “– – . – C (or F)” if a mea-

sured value falls outside the range of –20 60

C (–4 F to 140 F). The normal display will

return as soon as the temperature returns within the allowable range.

1. Hold down while in the Thermometer Mode 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

• If you do not operate any button for a few min-

utes while a selection is flashing, the flashing stops and the watch goes back to the Thermom- eter Mode automatically.

1. Hold down while in the Thermometer Mode and the current temperature digits flash.

2.Each press of increase the displayed temperature by 0.1 by 0.1

• If you have selected Fahrenheit as your unit of

measurement, the above operations change the reading by 0.2

• 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 rest the tem-

perature calibration to the factory setting.

3.After calibrating the temperature, press to return to the Temperature Display.

• If you do not operate any button for a few min-

utes while a selection is flashing, the flashing stops and the watch goes back to the Thermom- eter Mode automatically.

to return to the Temperature Display.

C, and pressing the decrease it

C to

Current time

Mode indicator

Hour

Minutes

Hourly time signal on indicator

3. Press to increase the selected digits or to decrease them. Holding down either button changes the selection at high speed.

• The format (12-hour and 24-hour) of the alarm time matches the format you select

for normal timekeeping.

• When setting the alarm time using the 12-hour format, take care to set the time

correctly as morning (A) or afternoon (P).

4.After you set the alarm time, press to return to the 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 Alarm Mode automatically.

To switch the daily alarm and hourly time signal on and off

Press while in the Alarm Mode to change the status of the daily alarm and hourly time signal in the following sequence.

To test the alarm

Hold down while in the Alarm Mode to sound the alarm.

Alarm on indicator Hourly time signal on indicator

Both ON Both OFF

When the Daily Alarm is turned on, the alarm sounds for 20 seconds at the preset time each day. Press any button to stop the alarm after it starts to sound. When the Hourly Time Signal is turned on, the watch beeps every hour on the hour.

To set the alarm time

1.Hold down while in the Alarm Mode. The hour

2.Press to change the selection in the following

Alarm on indicator

A digits flash on the display because they are se- lected. At this time the Daily Alarm is turned on automatically.

sequence.

Hour Minutes

Daily Alarm

only

Hourly Time

Signal only

ALARM MODE

Mode indicator

Minutes

To use the countdown timer

1.Press while in the Countdown Alarm Mode to start the countdown timer.

2.Press again to stop the countdown timer.

• You can resume countdown timer operation by pressing .

3.Stop the timer and then press to reset the countdown time to its starting value.

Seconds

Current

The countdown timer can be set within a range of

time

1 minute to 60 minutes. When the countdown reaches zero, an alarm sounds for 10 seconds or until you press any button.

To set the countdown time

1.Hold down while in the Countdown Alarm Mode. The minutes digits flash on the display because they are selected.

2. Press to increase the minutes digits or to decrease them. Holding down either button changes the setting at high speed.

3. After you set the countdown alarm time, press

• If you do not operate any button for a few min-

utes while a selection is flashing, the flashing stops and the watch goes back to the Countdown Alarm Mode automatically.

to return to the Countdown Alarm Mode.

COUNTDOWN ALARM MODE

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