La Crosse Technology WT3181P 18 Inch Atomic Wall Clock with Thermometer and Hygrometer

On your patio or porch, or by the pool, get the time, temperature, and humidity at a glance. The La Crosse Technology WT3181P is a large analog wall clock with a metal case. It features both an analog thermometer and an analog hygrometer on the lower half of its face. While this atomic clock can be used indoors, its primary application is outdoors in a shaded location. (Mounting this clock where the sun shines on it even part-time will cause an inaccurate temperature reading and possibly an incorrect hygrometer reading as well.)

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With a rugged metal case finished in a pewter tone and handsome styling that's neither too modern nor too traditional, the big, bold WT3181P will look good in almost any outdoor application

Overall diameter of the WT3181P is a full 18 inches (457.2 mm), and its face is 13.75 inches (349.3 mm) in diameter. The big, bold hour numerals are 1-3/16 inches (30.2 mm) tall for easy viewing from a distance. The analog thermometer has dual concentric temperature scales. One reads from -40° to +130°F, and the other reads from -35° to +55°C. The analog hygrometer indicates relative humidity from 0 to 100 percent. The clock's lens is glass for easy cleaning without scratching, and it's sealed with a rubber gasket to protect the face and hands from moisture.

Features:

Accurate to 1 second per million years.
Sets automatically to WWVB radio signal.
Pushbutton selection of all four U.S. mainland time zones.
Automatically adjusts for daylight saving time.
Manual time-set capability for use anywhere outside the WWVB signal range.
Analog thermometer indicates temperatures from -40° to +130°F and from -35° to +55°C.
Analog hygrometer indicates relative humidity from 0 to 100%.
Handsomely styled with white face, black hands and dial markings, and pewter-finished metal case.
Low-battery indication via 2-second steps of second hand.
Powered by one AA (1.5V) alkaline battery (not included), with normal life of about 1 year.

Dimensions:

Diameter:
18 inches (457.2 mm) overall
Depth:
2.25 inches (57.2 mm)

Radio-Controlled Time:

The NIST (National Institute of Standards and Technology, Time and Frequency Division) maintains a radio station, WWVB, in Ft. Collins, Colorado. The WWVB radio station derives its signal from the NIST atomic clock in Boulder, Colorado. A team of atomic physicists is continually measuring every second of every day, to an accuracy of ten billionths of a second per day. These physicists have created an international standard, measuring a second as 9,192,631,770 vibrations of a Cesium-133 atom in a vacuum.

WWVB (the station’s identification just like any other radio station) continuously broadcasts time and frequency signals at 60 kHz. The carrier frequency provides a stable frequency reference traceable to the national standard. There are no voice announcements on the station, but a time code is synchronized with the 60 kHz carrier and is broadcast continuously at a rate of 1 bit per second using pulse width modulation. The time code contains the year, day of year, hour, minute, second, and flags that indicate the status of Daylight Saving Time, leap years, and leap seconds.

The LaCrosse Technology WT3181P Atomic Wall Clock:

The La Crosse Technology WT3181P Atomic Wall Clock maintains its incredible accuracy by automatically tuning into the WWVB radio signal. The built-in antenna ensures reliable signal reception up to 2000 miles (3200km) from the WWVB transmitter. As a result, the La Crosse Technology clock will calibrate to the atomic clock not only throughout the mainland U.S. but also in much of Canada. You need only insert the battery, press the appropriate time zone button, and wait until the signal is received (overnight). In all other locations worldwide, the LaCrosse clock can be manually set and will provide the high degree of accuracy of any quality quartz clock.

In a nutshell, here's how the the LaCrosse clock works: The clock's antenna is specifically tuned for optimal reception of the 60 kHz time signal. The time signal received on the antenna is demodulated by an onboard receiver, which sends the information to the clock's CMOS microprocessor for decoding. Once your clock has automatically set its time for the first time, it ensures continuing accuracy by automatically tuning into the WWVB radio signal once per day after midnight. As long as your clock is kept within transmitter range, it will continue to display the absolutely precise time, even automatically adjusting for summer time/winter time changeovers. Should you move your clock out of transmitter range for an extended period of time, the clock will continue to operate as a highly accurate quartz-controlled clock. Upon re-entering the transmitter range, your clock will correct itself again to the precise WWVB time signal.

Note: This unit has atomic clock functionality. The atomic clock can receive time broadcasts from the U.S. Atomic clock transmitter in Colorado, and synchronize itself to the U.S. Atomic clock every night. As long as the signal is strong where the atomic clock is located, the atomic clock will maintain accuracy to a fraction of a second, and reset itself for daylight savings time (unless you choose to disable the DST function). However, if the atomic clock is located where the signal is poor, due to metal in the construction of your building blocking the signal, or due to electrical interference from nearby electrical appliances or computers, then the atomic clock may not always receive adequate signal. Under these conditions, the atomic clock may still synchronize occasionally, when weather conditions are ideal, or may need to be set manually.

La Crosse Technology WT3181P 18-Inch Atomic Wall Clock with Thermometer and Hygrometer

Atomic Clocks & Weather Instruments, La Crosse Technology Products Shop at Partshelf Mall

La Crosse Technology WT3181P 18 Inch Atomic Wall Clock with Thermometer and Hygrometer

Features:

Dimensions:

Radio-Controlled Time:

The LaCrosse Technology WT3181P Atomic Wall Clock: