Electronics Tomorrow 790E90712 Users Manual
INSTRUCTION MANUAL
Locations of Control
Main Unit (Receiver)
Remote Unit (Transmitter)
A
RESET BUTTON
B
°C/°F BUTTON
CG D
A HF E
B
REMOTE
WAVE BUTTON
A
- BUTTON
B
+ BUTTON
C
SET BUTTON
D
RE-SYNC BUTTON
E
DST / TIME ZONE BUTTON
F
RESET BUTTON
G
°C/°F BUTTON
H
A
B
• The configuration of your product may differ somewhat from that shown in the illustration.
• "AA" or "AAA" size battery. This product may use more than one piece of battery. Please refer to
the engraved battery marks inside the battery compartment for the correct battery type.
What is Radio Controlled Clock
With the Radio-Controlled Clock, you have the most accurate timepiece within the
continent. It can receive the time signal transmitted by the National Institute of Standards
and Technology ( NIST ), which is regulated by 3 atomic clocks and deviate less than 1
second within 3,000 years.
The NIST broadcasts the time signal ( WWVB, 60kHz ) continuously from Fort Collins,
Colorado. This signal can be received anywhere in the continental USA that long wave (AM)
radio reception is possible with a portable radio. It is expected that the signal can reach a
distance of 2,000 miles from the transmitter. Therefore, your clock will receive the signal
within the broadcast range anywhere an AM signal can be received; generally the signal
cannot be picked up in massive metal and concrete structures unless near a window. In
addition, some environmental effect ( see below ) may affect the transmitting distance.
For more information, please study the WWVB WEB page of NIST at :
http://www.boulder.nist.gov/timefreq/
Environmental Reception Effects
The Radio-Controlled Clock obtains the accurate time with wireless technology. Same as
all wireless devices, the receiving ability may be affected by, but not limited to, the following
conditions:
• Long transmitting distance.
• Nearby mountains and valleys.
• Among tall buildings.
• Near railway, high voltage cable, etc.
• Near freeway, airport, etc.
• Near construction site.
• Inside concrete buildings.
• Near electrical appliances.
• Bad weather.
• Inside moving vehicles.
• Nearby metallic structures.
P. 2
Feature
• Receive 60kHz WWVB signal transmitted by NIST at Fort Collins Colorado
• Automatic time adjustment after signal reception
• Calendar with day of the week display
• Hour, minute and second display
• Indoor temperature and remote temperature
• Centigrade or Fahrenheit readout
• Indoor temperature measurement range from -20°C ~ 70°C ( -4°F ~ 158°F )
• Outdoor temperature measurement range from -50°C ~ 70°C ( -58°F ~ 158°F )
• Temperature resolution 0.1°C ( 0.2°F )
• Clock operation temperature from 0°C ~ 50°C ( 32°F ~ 122°F )
• Time accuracy ( Atomic clock ) : better than 1 second in 2 million years
• Time accuracy ( free run ) : within +/-60second per month
Location Precautions
This clock receives a radio wave much like a TV or radio. Be sure to locate it near a window or
some other locations where reception is good.
Avoid the following locations, which can interfere with proper reception.
Inside or near concrete/ steel bulidings
or structures, unless the clock is close/
next to a window (with curtain open).
Too close to household appliances
(Computer, TV, video/audios, fax
machines, speakers).
Next or close to power station.
Near construction sites, traffic lights,
roadside, neon lights etc.
Inside moving vehicles (automobile, train, airplanes
etc) which radio transmission or electronics will
interfere the reception of radio-controlled clock.
Close to or on top of metal surfaces / plates.
Before You Begin
To ensure proper functioning of the unit, please follow this set up procedure.
• Insert batteries for the main unit ( Refer to section of Battery Installation )
• Place the main unit as close as possible next to the remote unit and insert batteries for the
remote unit.
• Position the remote unit and main unit within effective transmission range, which in usual
circumstances is 30 to 45 meters.
Note that the effective range is affected by the building materials and where the main and
remote unit are positioned, try various setup for the best results.
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