If uncertain that the WWVB atomic clock synch signal is being received, see our improving reception tips ( atomic clock synchronization). Most are accurate to one second per day or better, but some could be off by several seconds per day. Quartz clock accuracy depends on the quality of the quartz crystal. The clock is no longer radio controlled it's just a regular quartz clock. If an atomic radio controlled clock isn't currently receiving the WWVB atomic clock synch signal, it's time display will gradually “drift” away from the correct time. If uncertain that the WWVB atomic clock signal is being received, see the tips for improving reception on our atomic clock synchronization page. the radio controlled clock doesn't know about the time change. If DST is enabled, it's likely due to a reception problem, i.e. If Daylight Saving Time went into effect and the atomic radio controlled clock didn't change, first make sure DST is enabled (check the instructions). Not all atomic digital clocks have this feature and another time zone may have to be selected in order to make the clock display the correct time when DST is in effect. Make sure that DST is disabled in areas that do not observe Daylight Saving Time (Arizona, Hawaii, parts of Indiana). When purchasing a clock, make sure that it can display the correct time zone. Other atomic wall clocks may allow the selection of any time zone, even time zones that are outside the WWVB coverage area. Some atomic digital clocks only allow the selection of four different time zones (Pacific, Mountain, Central, and Eastern).
Make sure the time zone has been properly selected using the instructions that came with the clock. If the atomic radio controlled clock is off by one or more hours, it probably has to do with the time zone setting. Minutes and seconds are the same in all time zones, only hours are different.
CHANGING THE TIME ZONE ON A SYNCTIME ATOMIC WATCH MANUAL
Please be sure to save the clock's instruction manual in case future reference is necessary. If this check confirms the radio controlled clock isn't displaying the correct time, the following general tips may be helpful in correcting the problem. However if a problem with atomic clock synchronization is suspected, the clock should first be checked by using the NIST atomic clock on the internet or by listening to NIST radio station WWV using a shortwave radio or telephone (dial 30). They should always display the correct time. There is never a need to check an atomic radio controlled clock that is working properly, which is the great thing about how an atomic clock works. What To Do When The Time Displayed Is WrongĪtomic digital clocks works great, as is evident by the hundreds of thousands of units that have been sold throughout the United States.
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