Ambient Weather RC-1200WS Manual do utilizador - Página 5

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The clock will begin updating again after the M. SET button has not been pressed for two minutes.

The clock will attempt synchronization every two hours (1:00, 3:00, 5:00, 7:00, 9:00, 11:00, 13:00,

15:00, 17:00, 19:00 and 21:00). During synchronization, the second hand will operate properly.

10 Forced Radio Resynchronization

To force resynchronization from the atomic clock, press and hold the REC button for 3 seconds. The

hands will return to the 12:00 position.

The clock attempts to synchronize with the atomic clock for 12 minutes. If it synchronizes, the clock

sets properly. If it does not receive the signal from the atomic clock (very likely during the daytime),

the clock will begin running from the 12:00 position until the time synchronization is successful.

The clock will attempt synchronization every two hours (1:00, 3:00, 5:00, 7:00, 9:00, 11:00, 13:00,

15:00, 17:00, 19:00 and 21:00). During synchronization, the second hand will operate properly.

11 Maintenance

The device is maintenance-free, but should be cleaned occasionally. Only use a slightly dampened and

soft cloth to clean the housing. Do not use abrasives or solvents.

12 Specifications

Operating Voltage

Battery

Battery Life

Radio controlled time protocol

Dimensions

13 Glossary of Terms

Term

DST

RCC

WWVB

Version 1.0

1.5 Vdc

1 x AA

About 1 year (high quality batteries)

WWVB (USA)

Approximately 12"

Definition

Daylight saving time (DST) or summer time is the

practice of advancing clocks during the lighter months so

that evenings have more daylight and mornings have

less. Typically clocks are adjusted forward one hour near

the start of spring and are adjusted backward in the

autumn.

A radio-controlled clock is a clock that is synchronized

by a time code bit stream transmitted by a radio

transmitter connected to a time standard such as an

atomic clock.

WWVB is a NIST time signal radio station near Fort

Collins, Colorado. WWVB is the station that

radio-controlled clocks in most of North America use to

synchronize themselves. The 70 kW ERP signal

transmitted from WWVB is a continuous 60 kHz carrier

wave, the frequency of which is derived from a set of

atomic clocks located at the transmitter site, yielding a

frequency uncertainty of less than 1 part in one trillion.

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