La Crosse Technology WT-5431 Instruction Manual

Contents

La Crosse Technology WT-5431 Instruction Manual Manual pdf 9 page image

9IV. FEATURES & OPERATIONSA. FEATURES1. Radio-controlled time and date2. Projection of time and/or remote temperature3. EL backlight4. Six modes of date/seconds/temperature display5. Indoor temperature6. Remote outdoor temperature7. Dual alarms8. Adjustable snoozeB. RADIO-CONTROLLED TIME AND DATE1. The projection alarm will automatically search for the time signal uponinitial set-up and every night.2. When the signal is being received, there will be a “tower” icon flashing tothe left of the time display.3. When the time signal has been received successfully, the tower icon willremain steady until midnight.4. The NIST (National Institute of Standards and Technology—Time andFrequency Division) WWVB radio station is located in Ft. Collins,Colorado, and transmits the exact time signal continuously throughout theUnited States at 60 kHz. The signal can be received up to 2,000 miles awaythrough the internal antenna in the projection alarm.5. Due to the nature of the Earth’s Ionosphere, reception is very limited duringdaylight hours. The projection alarm will search for a signal every nightwhen reception is best.6. The WWVB radio station receives the time data from the NIST Atomicclock in Boulder, Colorado. A team of atomic physicists is continuallymeasuring every second, of every day, to an accuracy of ten billionths of asecond per day. These physicists have created an international standard,measuring a second as 9,192,631,770 vibrations of a Cesium-133 atom in avacuum.7. For more detail, visit http://www.boulder.nist.gov/timefreq.htm. To listen tothe NIST time, call (303) 499-7111. This number will connect you to anautomated time, announced at the top of the minute in “CoordinatedUniversal Time”, which is also known as Greenwich Mean Time (GMT).This time does not follow Daylight Saving Time changes. After the top ofthe minute, a tone will sound for every second.8. It is possible that your projection alarm may not be exactly on the seconddue to the variance in the quartz. However, the clock will adjust the quartztiming over the course of several days to be very accurate; under 0.10seconds per day.