1. Technology Description

The most accurate clock in America is the atomic cesium clock located at:

U.S. Department of Commerce

National Institute of Standards and Technology (NIST)

Boulder, Colorado

Your atomic watch receives "time telegrams" on long wave radio (60 kHz) from the NIST operated WWVB time signal transmitter located in Fort Collins, Colorado and coupled with the atomic cesium clock in Boulder. Until recently, the Transmitter was used predominantly by telephone companies, radio and television stations, navigators of planes and ships, and for scientific purposes in laboratories. Now this precise signal can be received by the atomic technology.

Your atomic watch receives the WWVB time signal via its built-in antenna system. This technology can ever receive the WWVB time signal, under optimal free field conditions (at night, free of radio disturbances such as metal structures, household appliances, computers, and particular climatic conditions), even outside of the United States as can be seen as can be seen on the map in Fig. 1. The proper function of the receiver contained in this product has been tested as a prototype with regard to its sensitivity and range of reception in different places throughout the United States. Any claim for warranty - express or implied - due to the watch's failure to properly receive the radio signal because of interference, whatever may be the source of this interference, are hereby expressly excluded in all respects.

Fig. 1 Reception range under optimal free field* conditions.

The atomic watch's internal computer processes the received time signals and automatically synchronizes the hands, date and the change over between daylight savings time and standard time and the leap year accordingly. The signal reception and synchronization occurs automatically every night and manually upon demand.

Even outside of the reception range your atomic watch will continue to keep excellent time. The highly accurate 32 kHz quartz movement will ensure precise time keeping.

2. Function description

Fig.2

T1 button (mode):

1. Switches the digital display between day (fro example 2.31) and the seconds (for example, 32).

2. Receives the WWVB time signal and synchronizes the time automatically.

T2 button (adjust):

Depending on the mode of T2 button either:

1. Advances the time zone in 1 hour increments when setting the time zones.

2. Advances the hands when manually synchronizing the watch.

3. Synchronizing the time (signal reception)

The signal reception and synchronization occurs automatically every night. At any desired time you can perform a "manual" reception by pressing the T1 button for at least 3 seconds. The hand will set to the 12 o'clock position (if the hands set to a time other than exactly 12 o'clock then they must be repositioned, see "synchronization the time manually" under 5. Replacing the battery) during reception and will reset themselves thereafter. Note that your atomic watch will not receive the WWVB time signal if set to a time zone other than pacific, mountain, central, or eastern standard time.

4. Setting the time zone

The factory preset time zone is Pacific standard time. You can set an alternative time zone as follows:

1. Press the T2 button/ The digital display will change from displaying the date (for example, 12.31) or second (for example 32) to displaying the current hour (for example, PO2 AM)

The letter P, M, C or E in front of the digitally displayed hour (or second) stand for Pacific, Mountain, Central or Eastern standard time respectively.

2. Press (either short for incremental advance or long time zone please take note of the AM/PM symbols in the digital display. The proper date will be calculated by the internal computer.

3. Press the T1 button to confirm and set the desired time. The hands and day will automatically follow.

5.Replacing the battery

A low battery is signaled by a blinking "LO" in the digital display.

The battery should be replaced by trained personnel to avoid damage and ensure water resistance according to the factory specifications.

After battery replacement the hands of your atomic watch must be repositioned to 12 o'clock. The hands can be advanced wither incrementally by repestedly pressing the T2 button or rapidly by holding the T2 button for about 4 seconds then releasing. After repositioning all hands to he 12 o'clock position, confirm this by pressing the T1 button. Your atomic watch will automatically receive the WWVB signal and set itself to the Pacific standard time. You must then either press the T1 button to confirm the time or set the desired time zone as described in 4. setting the time zone.

Dependent on your location and/or the time of day it may take between 3 and 30 minutes for a successful reception of the time signal. If you find yourself outside of the reception range or in a disturbance field, you need to synchronized the time manually as follows.

Syncronizing the time manually:

1. Press the T1 and T2 buttons simultaneously until the digital display goes blank (approximately 3 seconds).

2. After releasing the buttons, the hands of your radio controlled watch mush be repositioned to 12 o'clock. The hands can be advanced wither incrementally by repeatedly pressing the T2 button or rapidly by holding the T2 button pressed. After repositioning all hands to the 12 o'clock position, confirm this by depressing the T1 pressed.

3. Press the T2 button to advance the hands to the desired time. The hands can be advanced either incrementally by repeatedly pressing the T2 button or rapidly by holding the T2 button pressed.

4. Press the T1 button to confirm and set the time. The digital display will show the running seconds. It is not possible to set the date in the manual synchronized mode.

After manual synchronization, your atomic watch attempts to receive an automatic signal every hour on the hour until the WWVB signal has been successfully received. After the atomic watch receives a signal, it sets itself to Pacific standard time. You must then either press the T1 button to confirm the time or set the desired time zone as described in 4. Setting the time zone.

6. Technical Data

Reception Frequency 60 kHz, amplitude modulated, WWVB coding

Transmitter range See 1. Technical Description

Quartz time base 32 kHz

Battery type Li CR 1620 (3V/68 mAh)

Operating range voltage 2.4 V to 3.4 V

Battery life 2 years

Operating temperature 25°F to 130°F / -4°C to 54°C

Storage temperature -5°F to 160°F / -15°C to 70°C

This product complies with the EMC directive of the European Union and is subject to technical changes without notice.

Limited Warrenty

This Eurochron product is warranted by Eurochron to the customer for a period of one (1) year from the date of original purchase ("warranty period") against defects in material and workmanship. If such a defect occurs during the warranty period Eurochron will - at its option - repair or replace the product provided that proof of date a place of purchase is supplied by the customer. This limited warranty does not cover bracelets, straps, crystals, batteries or wear to the case nor does it apply in case of misuse or abuse including defects caused by servicing not performed by an authorized Eurochron SERVICE CENTER.

Exclusion of Warranty

The proper functioning of the receiver contained in this product has been tested as a prototype with regard to its sensitivity and range of reception in different places throughout the United States. Any Claims for warranty - Express or implied - due to the clock's failure to properly receive radio signals because of interference whatever may be the source of that interference are hereby expressly excluded in all respects.

Service for your Eurochron Atomic Watch

Should your watch require service, please send it in its original box to:

PWH - Attn: Service Department

1024 Reservoir Ave.

Cranston, RI 02910

1-401-944-5100