Casio 2662 Stopwatch, Reference, Dual Time, Backlight, About the Auto Light Switch, Moon Phase Indicator, Tide Graph, Auto Return Feature, Scrolling

Operation Guide 2662

To turn Alarms 2 through 5 on and off

	1. In the Alarm Mode, use D to select a one-time alarm
One-time alarm on	(alarm number 2 through 5).
indicator	2. Press B to toggle the displayed alarm on and off.
	• Turning on a one-time alarm (2 through 5) displays the
	one-time alarm on indicator (ALM) on its screen.
	• The one-time alarm on indicator is displayed in all
	modes.
	• If any alarm is on, the alarm on indicator is shown on
	the display in all modes.

To select the operation of Alarm 1

1.In the Alarm Mode, use D to select Alarm 1.

2.Press B to cycle through the available settings in the sequence shown below.

SNZ indicator and one-time alarm on indicator

	ALM		SNZ ALM
One-time alarm on		Snooze alarm on		Alarm off

•The applicable alarm on indicator (ALM or SNZ ALM) is displayed in all modes when an alarm is turned on.

•The SNZ indicator flashes during the 5-minute intervals between alarms.

•Displaying the Alarm 1 setting screen while the snooze alarm is turned on automatically turns off the snooze alarm (making Alarm 1 a one-time alarm).

To turn the hourly time signal on and off

Hourly time signal	1. In the Alarm Mode, use D to select the Hourly Time
	Signal.
on indicator	2. Press B to toggle it on and off.
	• Turning on the Hourly Time Signal displays the hourly
	time signal on indicator (SIG) on its screen.
	• The hourly time signal on indicator is displayed in all
	modes.

Stopwatch

About the Auto Light Switch

Turning on the auto light switch causes the backlight to turn on for about one second, whenever you position your wrist as described below in any mode.

Moving the watch to a position that is parallel to the ground and then tilting it towards you more than 40 degrees causes the backlight to turn on.

Parallel to	More than
ground	40°

Warning!

•Always make sure you are in a safe place whenever you are reading the display of the watch using the auto light switch. Be especially careful when running or engaged in any other activity that can result in accident or injury. Also take care that sudden illumination by the auto light switch does not surprise or distract others around you.

•When you are wearing the watch, make sure that its auto light switch is turned off before riding on a bicycle or operating a motorcycle or any other motor vehicle. Sudden and unintended operation of the auto light switch can create a distraction, which 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 D for about two seconds to toggle the auto light

switch on ( displayed) and off ( not displayed).

•The auto light switch on indicator () is on the display in all modes while the auto light switch is turned on.

Reference

This section contains more detailed and technical information about watch operation. It also contains important precautions and notes about the various features and functions of this watch.

Moon Phase Indicator

Minutes

HoursSeconds

1/100 second

The stopwatch lets you measure elapsed time, split times, and two finishes.

•The display range of the stopwatch is 99 hours, 59 minutes, 59.99 seconds.

•The stopwatch continues to run, restarting from zero after it reaches its limit, until you stop it.

•The stopwatch measurement operation continues even if you exit the Stopwatch Mode.

•Exiting the Stopwatch Mode while a split time is frozen on the display clears the split time and returns to elapsed time measurement.

•All of the operations in this section are performed in the Stopwatch Mode, which you enter by pressing C.

The Moon phase indicator of this watch indicates the current phase of the Moon as shown below.

	(part you cannot see)				Moon phase (part you can see)
Moon Phase
Indicator
Moon Age	0, 1, 29	2 - 5	6 - 9	10 - 13	14 - 16	17 - 20	21 - 24	25 - 28
Moon Phase	New		First		Full		Last
	Moon		Quarter		Moon		Quarter
			(Waxing)				(Waning)

• The Moon phase indicator shows the Moon as viewed at noon from a position in the

Northern Hemisphere looking south. Note that at times the image shown by the

To measure times with the stopwatch
Elapsed Time
D	➤D	➤ D	➤D	➤B
Start	Stop	Re-start	Stop	Clear
Split Time
D	➤B	➤B	➤D	➤B
Start	Split	Split release	Stop	Clear
	(SPL displayed)
Two Finishes
D	➤B	➤D	➤B	➤B
Start	Split	Stop	Split release	Clear
	First runner	Second runner	Display time of
	finishes.	finishes.	second runner.
	Display time of
	first runner.

Dual Time

Dual time	The Dual Time Mode lets you keep track of time in a
	different time zone.
(Hour : Minutes Seconds)
	• The seconds count of the Dual Time is synchronized
	with the seconds count of the Timekeeping Mode.
	To set the Dual Time
	1. Press C to enter the Dual Time Mode.
	2. Use A, B, and D to set the Dual Time Mode time.
	• Each press of D (+) and B (–) changes the time
	setting in 30-minute increments.
Timekeeping Mode time	• Pressing A sets the Dual Time Mode to the same time
	as the Timekeeping Mode.

Backlight

Moon phase indicator may differ from that of the actual Moon in your area.

• The left-right orientation of the Moon phase is reversed when viewing from the

Southern Hemisphere or from a point near the equator.

Moon Phases and Moon Age

The Moon goes through a regular 29.53-day cycle during which it appears to wax and wane due to how the Sun illuminates the Moon and the relative positioning of the Earth, Moon, and Sun. The greater the angular distance between the Moon and the Sun,* the more we see illuminated.

*The angle to the Moon in relation to the direction at which the Sun is visible from the Earth.

This watch perform a rough calculation of the current Moon age starting from day 0 of the moon age cycle. The actual Moon age average cycle is 29.53 days, but this can vary anywhere from –1 day to +1 day for specific months. Since this performs calculations using integer values only (no fractions), the margin for error of the displayed Moon age is ±2 days.

Tide Graph

The tide graphic on the watch’s tide graph indicates the current tide.

Low tide High tide

Tidal Movements

Tides are the periodic rise and fall of the water of oceans, seas, bays, and other bodies of water caused mainly by the gravitational interactions between the Earth, Moon and Sun. Tides rise and fall about every six hours. The tide graph of this watch indicates tidal movement based on the Moon’s transit over a meridian and the lunitidal interval. The lunitidal interval differs according to your current location, so you must specify a lunitidal interval in order to obtain the correct tide graph readings.

Lunitidal Interval

Auto light switch on indicator

The backlight uses an EL (electro-luminescent) panel that causes the entire display to glow for easy reading in the dark. The watch’s auto light switch automatically turns on the backlight when you angle the watch towards your face.

•The auto light switch must be turned on (indicated by the auto light switch on indicator) for it to operate.

•See “Backlight Precautions” for other important information about using the backlight.

To turn on the backlight manually

In any mode, press L to illuminate the display for about one second.

•The above operation turns on the backlight regardless of the current auto light switch setting.

Theoretically, high tide is at the Moon’s transit over the meridian and low tide is about six hours later. Actual high tide occurs somewhat later, due to factors such as viscosity, friction, and underwater topography. Both the time differential between the Moon’s transit over the meridian until high tide and the time differential between the Moon’s transit over the meridian until low tide are known as the “lunitidal interval.” When setting the lunitidal interval for this watch, use the time differential between the Moon’s transit over the meridian until high tide.

Auto Return Feature

If you leave a screen with flashing digits on the display for two or three minutes without performing any operation, the watch automatically saves any settings you have made up to that point and exits the setting screen.

Scrolling

The B and D buttons are used in various modes and setting screens to scroll through data on the display. In most cases, holding down these buttons during a scroll operation scrolls through the data at high speed.

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