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GW-810
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Contents |
[edit] Summary
[edit] Photos
[edit] Features and Specifications
- Multi-Band Atomic Timekeeping (US, UK, Germany, Japan)
- Receives time calibration radio signals which keep the displayed time accurate
- Auto receive function (6 times per day)
- Manual receive function
- Signal: US WWVB, UK MSF, Germany DCF77, Japan JJY40/JJY60
- Frequency: US 60kHz, UK 60kHz, Germany 77.5kHz, Japan 40/60kHz
- Tough Solar Power
- Shock Resistant
- 200M Water Resistant
- Auto EL Backlight with Afterglow
- World Time
- 29 times zones (48 cities), city code display, daylight saving on/off
- 5 Daily Alarms (1 with snooze)
- Countdown Timer
- Measuring unit: 1/10 second
- Countdown range: 1 minute to 60 minutes
- 1/100 second stopwatch
- Measuring capacity: 999:59'59.99"
- Measuring modes: Elapsed time, split time, 1st-2nd place times
- Hourly Time Signal
- Auto Calendar (pre-programmed until the year 2099)
- 12/24 Hour Formats
- Accuracy: ±15 seconds per month (with no signal calibration)
- Storage Battery CTL1616
- Battery Power Indicator
- Power Saving Function
- Approx. battery life: 9 months on full charge (without further exposure to light)
- Module 3050
- Dimensions: 51.5 x 42.5 x 13.9mm
- Weight: 132g
- Retail price: $150
[edit] Reviews
[edit] Miscellaneous and Trivia
[edit] Removing the Back
To remove the back the straps need to be removed first . This is achieved by first removing the spring clips at the end of the band. This is done by using the holes in the side of the band. A paper clip can be inserted to assist with this.
After that, the plastic end covers can be removed - and this reveals the four casing screws. (The screws on the side of the case need not be touched). Simply unscrew these screws and carefully lift the metal cover off. Under this is a rubber layer. Careful lift this off keeping note of orientation.
When replacing the metal cover, it is advisable to relubricate the rubber seal with silicon grease to maintain water resistance.
[edit] Adjusting the Accuracy of the 3050 Module
With the rear metal cover removed and the rubber layer lifted off, an adjustment screw is visible. At about 11 O'Clock relative to the adjustment screw (with the top of the watch at 12 O'Clock) there is a pad (at the edge of the module) that shows a stepped square-wave shape when viewed with an oscilloscope (put the ground on battery negative). The frequency of this should be precisely 32768/48=682.6666666... Hz for a perfectly accurate watch. An oscilloscope (or a high impedance, accurate and calibrated frequency counter) should be used to examine this waveform. If the oscilloscope is triggered by an accurate frequency generator (at 682.6666666... hz) then the watch can be set at best at around 1 part in 1000000. i.e. 1 millionth of a second per second. This equates to about one second every 11 days.
All this is useful for owners of this watch not in range of low frequency atomic time standards.
