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The Casio F-91W is a digital watch manufactured by Japanese electronics company Casio. Introduced in 1989,[1] it is popular for its simplicity, reliability, and unpretentious clean design. Due to this reason, it is still in production with the same design.[2] Annual production of the watch is 3 million units per year.[3] The F-91W is a part of the Casio F-series watches.
Specifications[edit]Design[edit]
Designed by Ryusuke Moriai as his first design for Casio,[4] the case of the F-91W measures 37.5 by 33.5 by 8.5 millimetres (1.48 by 1.32 by 0.33 in) and weighs 21 grams (0.74 oz). The case is primarily made of plastic, with a stainless steel caseback and buttons with the manufacturer's module number, 593, stamped on the caseback. The resin strap is 18 millimetres (0.71 in) at the fitting and 22mm across the widest part of the lugs.
Features[edit]
The F-91W has a 1⁄100 second stopwatch with a count up to 59:59.99 (nearly one hour). The stop watch also has the feature to mark net and split time (lap). Other features include an hourly time beep (hourly chime) and a single daily alarm lasting 20 seconds and an automatic calendar, although auto-adjustment for leap years is not supported as the watch does not record the year. February is always counted as 28 days.[5] The watch uses a faint, green LED backlight located to the left of the display for illumination (in earlier versions it was an amber microlight). According to manufacturer estimates, the watch is reported to be accurate to ±30 seconds per month.[5]
The quartz movement is powered by a single CR2016 3-volt lithium button cell, which lasts at least seven years,[citation needed] assuming 20 seconds of alarm and one second of light usage per day. However, these are seldom used in practice, so it is not uncommon for the battery to last 10 years or longer.
Water resistance[edit]
The watch front is marked WATER RESIST,[5] but Casio reports different values for different variants of the watch. The black version (F91W-1)[6] is '30 meter / 3 bar', the ISO standard meaning of which is: 'Suitable for everyday use. Splash/rain resistant. NOT suitable for showering, bathing, swimming, snorkeling, water related work and fishing'.
Operation[edit]
Casio F-91W, in regular timekeeping mode and using the 24-hour display option. The watch is currently set to sound the alarm and hourly chime
The watch is controlled by three side-mounted push-buttons. The upper left button turns on the light, cancels the alarm, resets the stopwatch or marks the split (lap) time, and is used for selecting settings. The lower left button cycles the modes of the watch: time display, alarm, stopwatch, and time/date adjustment. The button on the right is the function button: when used, it starts and stops the stopwatch, changes the settings currently being adjusted, or switches between the 12- and 24-hour modes, depending on what mode the watch is currently in. Pressing all three buttons at the same time will fill all the cells on the LCD until any button is pressed again.[7] The time or date is adjusted by pressing the lower left button three times to bring the watch to time adjustment mode. The top left button is used to cycle through seconds, hours, minutes, month, date, day, and normal mode. The right button is used to adjust the flashing value displayed. Unlike any other value, the seconds can only be zeroed. Should this happen before 30 seconds, the watch will zero in at the beginning of the current minute. After 30 seconds it will start the next minute as displayed. When the adjustments are finished, the bottom left button can be pressed once to return the watch to normal mode.
The watch display shows the day of the week, day of the month, hour, minute, seconds, and the signs PM in the afternoon – or 24H (24-hour clock) – at all times, the alarm signal status (bar of vertical lines), and the hourly signal status (double beep on the hour, shown as a bell) are present when activated in the alarm mode.
In stopwatch mode, minutes, seconds, and hundredths of a second are shown.
Usage in terrorism[edit]
This improvised timer for a time bomb was captured in the early 2000s.
According to secret documents issued to interrogators at Guantanamo Bay, obtained[8] and released by The Guardian, 'the Casio F-91W digital watch was declared to be 'the sign of al-Qaeda' and a contributing factor to continued detention of prisoners by the analysts stationed at Guantanamo Bay. Briefing documents used to train staff in assessing the threat level of new detainees advise that possession of the F-91W and the A159W – available online for as little as £4 – suggests the wearer has been trained in bomb making by al-Qaeda in Afghanistan.'[9] United States Military intelligence officials have identified the F-91W as a watch that terrorists use in constructing time bombs.[10][11][12][13]
This association was highlighted in the Denbeaux study, and may have been used in some cases at the Guantanamo Bay detention camp.[14] An article published in the Washington Post in 1996 reported that Abdul Hakim Murad, Wali Khan Amin Shah, and Ramzi Ahmed Yousef had developed techniques to use commonly available Casio digital watches to detonate time bombs.[15]
On July 12, 2006, the magazine Mother Jones provided excerpts from the transcripts of a selection of the Guantanamo detainees.[12]The article informed readers:
More than a dozen detainees were cited for owning cheap digital watches, particularly 'the infamous Casio watch of the type used by Al Qaeda members for bomb detonators.'
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The article quoted Abdullah Kamel Abudallah Kamel:
When they told me that Casios were used by Al Qaeda and the watch was for explosives, I was shocked.. If I had known that, I would have thrown it away. I'm not stupid. We have four chaplains [at Guantanamo]; all of them wear this watch.
Variants[edit]
Reception[edit]
Pressing the right hand button for 3 seconds in the main timekeeping mode leads the display to read 'CASIo' which is useful to spot a counterfeit (applicable for newer models of the F-91W and its variants)
The watch is worn all over the world. Its good design, high durability, low price and user friendly simplicity all contribute to this phenomenon. It has become a fashion statement and some variants have also become 'collector items' in the watch community. 'It is a modest masterpiece', says design critic Stephen Bayley.[2]
Counterfeits[edit]
Counterfeits, which are quite common although the price tag of the original is very low, generally have a slightly lower plastic build quality, the LCD viewing angles are not as wide, and are significantly less accurate than the original.[17] The newer modules with the green LED light can be tested by pressing the right button for over 3 seconds in the main timekeeping mode; this action would lead the display to read 'CASIo', as a test for authenticity. With the advancement in technology, however, counterfeit watches have also been developed to show the 'CASIo' sign. This leaves the only method of distinguishing them as assessing the overall build quality, time keeping, display and the printing on the screen.[17][18]
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Counterfeit gold-coloured models, such as the A-159 and A-168, often erroneously plate the back of the bracelet in gold color. Genuine versions only expose stainless steel to skin, which makes this a giveaway for counterfeit models.[citation needed]
References[edit]
External links[edit]
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Casio_F-91W&oldid=916049864'
Casio 593 Watch Manual Online
Operation Guide 10B+7L(Ver.C)
PM
[
mode
[Stopwatch mode]
setting mode]
SU: Sunday, MO: Monday, TU: Tuesday, WE: Wednesday, TH: Thursday, FR: Friday, SA: Saturday
(Changeover between 12-hour and 24-hour formats) In regular timekeeping mode,
with every push of A, the display is switched between 12-hour and 24-hour formats.
Minute
(Light)
Day
PM
1/100 second
Hour
Hour
Mode
Alarm-
Time-signal-on-mark
C.
C.
C.
A
Minute
PressC.
Setting daily alarm
If the daily alarm is set, the buzzer sounds for 20 seconds at the preset time every day
until cleared. To stop the buzzer, press the Lbutton. If the time signal is set, the watch
(Sound demonstration) Press and hold the
button in alarm mode to sound the buzzer.
If the
Casio Manuals Free
button is pressed, the watch reverts to the regular timekeeping mode.
(Quick digit advance) When the Abutton is pressed for more than 2 seconds, the digit
advances quickly. When released, the digit advance will stop.
Press L to set minute digits.
push of A. Press Lto complete.*
set hour. One hour advances with
A
L
[On or off setting of daily alarm and time signal]
mark and time-
appear.]
mark and time-
disappear.]
on-mark only ap-
The daily alarm
sound.
and time signal
The daily alarm
The time signal
PressA.
A.
A.
Casio 593 Watch Manual Pdf
A.
only appears.]
L
A signal confirms start/stop operation.
(Working range) The stopwatch display is limited to 59
minutes 59.99 seconds, for longer times reset and start
C
A
StartStopRe-startStopReset
ResetStart
Split release
Start
The first runner
Stop
finishes. Record the
Split release
of the second
(b) Split time measurement
Time loss
IMPORTANT: Setting sequence MUST BE FOLLOWED when making any new setting.
[Date setting][Day setting]
•Correction of any digit, if not required, can be skipped by pressing the Lbutton
•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 regular timekeeping mode automat-
Press Lto move to the
increase the number.
setting. Press Ato increase
Press Lto move to the day
es to the next day. And press
Setting time and calendar
Regular timekeeping
PM
seconds.*
[Second adjusting][Hour setting][Minute setting]
to change regular
to time/calendar
Press Lto move to
Press Ato increase
Press Lto move to
Press Ato increase
A
L
Precise time can be maintained by correcting the seconds once a month on a time signal from
(Quick digit advance) When the Abutton is pressed for more than 2 seconds, the digit
advances quickly. When released, the digit advance will stop.
Accuracy at normal temperature: ±30 seconds a month
•Regular timekeeping mode
Calendar system: Auto-calendar set at 28 days for February
•Hourly time signal function
Measuring capacity: 59 minutes 59.99 seconds
Measuring modes: Normal time, net time, split time and 1st-2nd place times
One lithium battery (type: CR-2016 –– except Module 1271/BR-2020 –– Module 1271 only)
Approx. 7 years operation on type CR-2016 (except Module 1271) /10 years on type BR-
2020 (Module 1271 only). [assuming alarm operation for 20 sec./day and one light operation
NOTE:THERE IS NO WAY unit components can be damaged or malfunction, due to
misoperation of buttons. If confusing information appears on the display it means entry
sequence was incorrect. Please read the manual and try again.
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