La Crosse Technology WT-3145U User Manual
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Model WT-3145
Radio Controlled Analog Clock
Welcome to the world of atomic timekeeping technology. We hope you will enjoy
the convenience of never having to set your clock again and the confidence of
knowing exactly what time it is
Insert 1 new AA, LR6 1.5 volt ALKALINE battery in the analog clock battery
compartment according to the polarity marked on the case, then 1 new
battery AA, LR6 1.5 V into the digital clock.
Once the battery is installed, the clock will begin searching for a signal. For
the initial setting, it is recommended to stand the clock in an upright
position near a window. Within 3 - 10 minutes the clock will either receive
the WWVB signal and set itself to the exact time (for the default Pacific
Time Zone), or it will determine that the signal is not receivable at its
current location and time of day. If the clock does not receive a radio signal
soon after activated, the clock will start running from the 12:00 position and
will continue to run. In this case, do not attempt to reset the hands
manually even though the time displayed on the clock is incorrect. The
clock is synchronizing to the WWVB signal and once the radio signal is
decoded, the hands will automatically adjust to the correct time. The clock
will fast-forward the hands to the 12 o’clock position immediately and
search for WWVB at specific time until a signal is received. If the time is
manually set, the clock will continue to periodically search for a signal and
automatically reset the hands when the signal is received.
Press time zone button to select a time zone after the clock received the
WWVB signal. If you are in the Pacific Time Zone- you are ready to hang
your clock.
If you are not in the Pacific Time Zone, select your time zone by press and
holding for 5 second, one of the four time zone buttons PT-Pacific Time,
MT-Mountain Time, CT-Central Time, ET-Eastern Time. If multiple buttons
are pressed, the clock will set to the time zone selected last. If no time
zone is selected the clock will default to Pacific Time. If you live in an area
that does not recognize DST (Arizona) you must press the (unmarked) DST
button for one second to deactivate your clock’s DST program.
For time zones outside of PT, MT, CT or ET you must manually set the time
using the Manual Time set button on the back of the movement. (See
instructions below). Please Note: WWVB time will over ride a manual
setting.
Quick Setup Instructions
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COMPARTMENT
DIGITAL CLOC
BATTER
FOR THE
BATTERY
COMPARTMENT
FOR THE
NALOG CLOCK
MANUAL TIME SET
For a better understanding of how and why your clock works please continue
reading.
NOTHING IS MORE PRECISELY MEASURED THAN TIME!
Since the beginning of time, man has been fascinated with the measurement of
time and has devised more accurate machines to trap and measure time. Today,
time is precisely measured in the United States by the most accurate clock in
North America, the Atomic Clock of the US National Institute of Standards and
Technology, Time and Frequency Division in Boulder, Colorado. A team of
atomic physicists continually measures 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. This atomic clock regulates the WWVB radio
transmitter located in Fort Collins, Colorado, where the exact time signal is
continuously broadcast throughout the United States at 60 kHz to take advantage
of stable long wave radio paths found in that frequency range. Radio waves at
these low frequencies use the earth and the ionosphere as a wave-guide and
follow the curvature of the earth for long distances.
The built in antenna system will receive the WWVB signal anywhere in North
America within 2000 miles of Fort Collins where long-wave radio reception is
undisturbed. A microprocessor activates the receiver and processes the time
signal from Fort Collins overnight.
Through the radio signals, La Crosse Technology atomic clocks always keep
precise time. The changeover from standard time to daylight saving time, and
vice versa, takes place automatically with the same precision.
ADDITIONAL DETAILS
To set up your clock simply install one new AA, LR6 ALKALINE battery.
Due to the nature of long wave radio signals it is normally not possible to
receive a signal during the day so it is best to install the battery late in the
evening. After the clock sets itself to Pacific Time, select your time zone by
pressing one of the four time zone buttons PT-Pacific Time, MT-Mountain
Time, CT-Central Time, ET-Eastern Time. Your clock can only set itself to
BUTTON
PACIFIC TIME
MOUNTAIN TIME
CENTRAL TIME
BATTERY
COMPARTMENT
EASTERN TIME
DST ON/OFF BUTTON
1
one of the four time zones stated above. For time zones outside of PT, MT,
CT or ET you must manually set the time using the Manual Time set button
on the back of the movement. Please Note: WWVB time will over ride a
manual setting.
The La Crosse Technology atomic clock is designed for indoor use. For indoor
locations, select a location to place your radio controlled clock where it will be at
least six feet away from a TV, computer, air conditioner or other household
electrical appliances. The optimal location is near a window. Windows facing
Colorado provide the best signal.
Note:
Do not submerge clock in water.
Extreme temperatures, vibration, and shock should be avoided to prevent
damage to the clock.
The WWVB time signal will easily penetrate masonry and wood framed buildings.
The WWVB signal will penetrate almost every residential building and most steel
buildings if they have adequate windows. It is not possible, however, for the
WWVB signal to penetrate most indoor shopping malls and rooms in the center
of large office buildings that do not have windows. In buildings that WWVB
cannot penetrate you may set the time using the manual time set button. When
the clock receives the WWVB signal it will automatically set the hands to the
exact time.
La Crosse Technology atomic clocks do not receive or process radio
controlled time signals from Germany’s DCF 77, Japan’s J Ga AS, or
England’s MSFs atomically regulated transmitters. La Crosse Technology
atomic clocks can be manually set and used anywhere. Please Note: WWVB
time will over ride a manual setting.
For more information on the NIST and radio controlled time, see
www.boulder.nist.gov/timefreq/
SET THE TIME USING THE MANUAL TIME SET BUTTON
In some cases, the La Crosse Technology atomic clock may not receive the
WWVB signal due to atmospheric disturbances or hard to reach locations such
as inside shopping malls. In this case, please use the Manual Time Set button,
located at the back of the clock to manually set the time. To do this:
1. Remove the batt er y and press the Manual set button 10 times.
2. I nser t 1 new AA Alkalin e battery.
3. Pr ess and hold the Manual Set butt on until the second hand of the clock
4. Release t he Manual Set button and again press and hold the Manual Set
5. Keep holding the Manual Set button until the time is set as required.
6. Release the button. About 3 seconds later, the second hands will start to
Note: When the clock displays manual time, it will continue to try to receive the
WWVB signal at each of the even numbered hours: 0:00, 2:00, 4:00, 6:00 …
20:00 & 22:00.
moves to the 12 position.
button. The minute and hour hands will fast-forward while the button is
held.
move and the clock is now running with manual time.
MANUAL TIME
SET
BUTTON
DIGITAL CLOCK
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1. Remove the battery cover at the back of the clock and insert 1 AA Alkaline
battery in the battery compartment.
2. All segments of the LCD will light up briefly, then the display “-:--“ and the
current indoor temperature will be displayed.
Note:
3. Wait for the digital clock to receive the WWVB time and date from the
Notes:
The time of the digital clock cannot be manually set. It will receive the
The time format is fixed to "12-hr" time display. "PM" will be shown in hours
The calendar will also be updated once the WWVB signal from the analog
WORLD TIME SETTING:
This feature allows you to choose a 2
in the world you choose. The world time can be manually adjusted by 1hour
increment (24 hour time zone).
1. Press the Time Set key to enter world time setting.
2. Press again the Time Set key to set the desired world time; each pressing
Notes:
Once the WWVB signal has been received by the digital clock, the
If a world time has been manually set prior reception of the WWVB time,
The calendar (month/day) will not follow the set world time; it can only be
CHANGING THE DISPLAY MODE (Indoor Temperature, Date, Weekday,
World Time, Seconds)
There are 4 possible display modes to view the indoor, month & day, weekday,
world time, seconds.
The month & day / indoor temperature is the default display.
To change the display:
1. Press the Display key once. The display will show the month & day /
2. Press the Display key a second time. The display will show the world time /
3. Press the Display key a third time. The display will show the world time /
4. Press the Display key a fourth time. The display will return to the default
If the Display time is pressed while the analog clock is still searching
for the WWVB signal, the digital clock will display “--/--“ for the date and “-:-“ for the world time.
analog clock. Then the digital clock will start normal runs.
BATTERY COMPARTMENT
COVER
DISPLA
TIME SET KEY (FOR
KE
WORLD TIME)
BATTERY COMPARTMENT
WWVB time from the analog clock.
from noon to midnight.
clock has been received.
nd
time to be displayed from anywhere
of the key will increase the world time by 1 hour.
manually set world time will be updated.
the time in the digital clock will change correspondingly with the analog
clock.
updated from the WWVB signal.
weekday.
indoor temperature.
the indoor temperature can only be displayed in degree Fahrenheit.
Note:
The temperature range is from 14.2ºF to 103.8ºF with 0.2ºF resolution. The
temperature is updated every 20 seconds.
seconds.
display.
Month & day / Indoor temperature
World time / Indoor temperature
Note: If the Display key is pressed during the initial set-up of the analog clock,
the date and world time sections will not be shown in the different display modes.
LOW BATTERY ICON
When the battery of the digital clock needs to be replaced, the low battery icon
will appear on the LCD section of the digital clock.
TROUBLESHOOTING
The wonderful advantage of owning a La Crosse Technology atomic clock is that
it is virtually trouble free. If the clock receives a clear signal it will set itself
perfectly. If it does not receive a signal consider the following:
Battery - The La Crosse Technology atomic clock must have a fresh battery to
Location - Try a different location, ideally near a window. It should be at least six
Weather - Electrical storms between you and Colorado during the night will
Reception - The clock seems to “take off” for no reason and then
DAYLIGHT SAVING TIME
The National Institute of Standards and Technology and WWVB encode a special
DST “bit” in the WWVB transmission for DST. Your La Crosse Technology clock
will read this information and automatically advance the hands one hour in the
spring and eleven hours in the fall.
ARIZONA
If you live in an area that does not recognize DST you must press the (unmarked)
DST button for one second to deactivate your clock’s DST program. To
reactivate the DST program simply press the DST button again for one second.
WARRANTY
La Crosse Technology, Ltd provides a 1-year limited warranty on this product
against manufacturing defects in materials and workmanship.
This limited warranty begins on the original date of purchase, is valid only on
products purchased and used in North America and only to the original purchaser
of this product. To receive warranty service, the purchaser must contact La
Crosse Technology, Ltd for problem determination and service procedures.
Warranty service can only be performed by a La Crosse Technology, Ltd
authorized service center. The original dated bill of sale must be presented upon
request as proof of purchase to La Crosse Technology, Ltd or La Crosse
Technology, Ltd’s authorized service center.
La Crosse Technology, Ltd will repair or replace this product, at our option and at
no charge as stipulated herein, with new or reconditioned parts or products if
found to be defective during the limited warranty period specified above. All
replaced parts and products become the property of La Crosse Technology, Ltd
receive and process the time signal.
feet from computers, TVs, air conditioners, other atomic clocks and
other electrical appliances that cause interference.
interfere with the WWVB signal.
stopping at the same time.
It is not uncommon for the clock to make a "correction",
sometimes daily. This happens if the clock gets ahead of itself by
a fraction of a second. To correct this, the clock will advance a
complete rotation the next time it receives a signal.
Month & day / Weekday
World Time / Seconds
2
and must be returned to La Crosse Technology, Ltd. Replacement parts and
products assume the remaining original warranty, or ninety (90) days, whichever
is longer. La Crosse Technology, Ltd will pay all expenses for labor and
materials for all repairs covered by this warranty. If necessary repairs are not
covered by this warranty, or if a product is examined which is not in need or
repair, you will be charged for the repairs or examination. The owner must pay
any shipping charges incurred in getting your La Crosse Technology, Ltd product
to a La Crosse Technology, Ltd authorized service center. La Crosse
Technology, Ltd will pay ground return shipping charges to the owner of the
product to a USA address only.
Your La Crosse Technology, Ltd warranty covers all defects in material and
workmanship with the following specified exceptions: (1) damage caused by
accident, unreasonable use or neglect (including the lack of reasonable and
necessary maintenance); (2) damage occurring during shipment (claims must be
presented to the carrier); (3) damage to, or deterioration of, any accessory or
decorative surface; (4) damage resulting from failure to follow instructions
contained in your owner’s manual; (5) damage resulting from the performance of
repairs or alterations by someone other than an authorized La Crosse
Technology, Ltd authorized service center; (6) units used for other than home
use (7) applications and uses that this product was not intended or (8) the
products inability to receive a signal due to any source of interference. This
warranty covers only actual defects within the product itself, and does not cover
the cost of installation or removal from a fixed installation, normal set-up or
adjustments, claims based on misrepresentation by the seller or performance
variations resulting from installation-related circumstances.
LA CROSSE TECHNOLOGY, LTD WILL NOT ASSUME LIABILITY FOR
INCIDENTAL, CONSEQUENTIAL, PUNITIVE, OR OTHER SIMILAR DA MAGES
ASSOCIATED WITH THE OPERATION OR MALFUNCTION OF THIS
PRODUCT. THIS PRODUCT IS NOT TO BE USED FOR MEDICAL
PURPOSES OR FOR PUBLIC INFORMATION. THIS PRODUCT IS NOT A
TOY. KEEP OUT OF CHILDREN’S REACH.
This warranty gives you specific legal rights. You may also have other rights
specific to your State. Some States do no allow the exclusion of consequential or
incidental damages therefore the above exclusion of limitation may not apply to
you.
For warranty work, technical support, or information contact:
The complete instruction manual is available at:
www.lacrossetechnology.com/support
Le manuel d'instruction complet est disponible sur:
www.lacrossetechnology.com
El manual de instrucciones completo está disponible en:
www.lacrossetechnology.com
All rights reserved. This handbook must not be reproduced in any form, even in
excerpts, or duplicated or processed using electronic, mechanical or chemical
procedures without written permission of the publisher.
This handbook may contain mistakes and printing errors. The information in this
handbook is regularly checked and corrections made in the next issue. We accept no
liability for technical mistakes or printing errors, or their consequences.
All trademarks and patents are acknowledged.
La Crosse Technology, Ltd
2817 Losey Blvd. S.
La Crosse, WI 54601
/ support
/ support
EJMA3145L210
Printed in China
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