Electronics Tomorrow 838A170306 1-Channel RF (Rx) in/Remote Thermo Wallclock + RCC User Manual

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Document ID	671659
Application ID	cOWMdE6ma1Nx+BivflNkmw==
Document Description	User manual
Short Term Confidential	No
Permanent Confidential	No
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Document Type	User Manual
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Filesize	177.59kB (2219899 bits)
Date Submitted	2006-06-22 00:00:00
Date Available	2006-06-22 00:00:00
Creation Date	2006-04-20 12:43:22
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Document Lastmod	2006-04-20 12:45:21
Document Title	User manual
Document Creator	Adobe Acrobat 7.0

Size: 140mm(W) x 177mm(H)
M???(838A+6725) Ver 1 R1
INSTRUCTION MANUAL
Locations of Control
Main Unit (Receiver)
h! SET BUTTON
IE! + (Forward Set) BUTTON
°C/ °F BUTTON
D] - (Backward Set) BUTTON
DSTfl'lME ZONE BUTTON
RESET BUTTON
RE-SYNC BUTTON
WAVE BUTTON
Model 838A
Remote Unit (Transmitter)
RESET Button
Model 6725
- The configuration of your clock may differ somewhat from that shown in the illustration
- "AA" or "AAA" size battery. This clock may use more than one piece of battery. Please refer to the
engraved battery marks inside the battery compartment for the correct battery type.
P.2
The 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 deviates 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 effects (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.
M???
R3
R4
Features
- Receive 60kHz WWVB signal transmitted by NIST in Fort Collins, Colorado.
~ Calendar with day-of-the-week display from January 1, 2005 to December 31, 2049.
- Automatic time and date adjustment after signal reception
- Hour, minute and second display.
- 12 or 24-hour format.
~ Crystal oscillator frequency: 32.768kHz.
- Time accuracy (free run); 60 seconds per month.
- Time accuracy (Atomic clock): better then 1 second in 2 million years.
- Centigrade or Fahrenheit readout
- Clock operating temperature from 0°C to 50°C ( 32°F to 122°F )
- Indoor Temperature measuring range from -20°C to 70°C (-4°F to 158°F )‘
- Outdoor Temperature measuring range from -50°C to 70°C (-58°F to 158°F )*
‘lf using the wireless transmitter with temperature below 32°F or above 122°F, user are
recommended to use Lithium battery to enhance batteries life.
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.
Batteries Installation
Batteries installation of the main unit
~ Insert batteries in polarity (+) and (-) as indicated
- Close the battery cover
- The low battery icon will show in the display when your batteries need replacing
Batteries installation of remote unit
- Insert batteries in proper polarity (+) and (-) as indicated
- Close the battery door
Warning : Do not mix old and new batteries
Do not mix alkaline, standard (carbon-zinc), or rechargeable (nickel cadmium)
batteries.
Do not touch any other buttons or settings on your main unit. It will automatically receive
the remote temperature.
Getting Started
Setting the Time Zone and DST
1. Press the "DST/Time Zone" button to select the appropriate time zone. (please see *)
2. The unit is default with DST activated. If it is used in regions do not observe DST, please
follow the following procedures to deactivate DST (please see *):
i. Hold down the "DST/Time Zone" button for about 4 seconds, "DST" and "On" blinking on
the LCD display.
ii. Press + or - to toggle between DST ON and DST OFF.
iii.Press "DST/Time Zone" button again for normal operation.
* The Clock is set to show the Eastern Standard Time (EST) with Daylight Saving Time as a factory
setting. Please adjust these switches according to you location.
Thermometer
- Upon power up of the remote unit (or pressing the reset button), the temperature RF
signal is immediately sent to the main unit. The main unit attempts to receive the RF
temperature signal for 5 minutes. The main unit refreshes the RF temperature every 3
minutes.
. If the RF temperature signal is not received within 5 minutes after power up of the main unit
(or pressing the reset button), blank "---" will appear in the outdoor temperature window of
the main unit. In this case, press the RE-SYNC button of the main unit. The main unit will
attempt outdoor temperature reception for another 6 minutes.
- After the remote temperature shows in the lower LCD panel, place the remote unit outside in
a shaded, dry area to protect it as if under an umbrella.
Signal Receive Operation
The main unit automatically receives the time signal 1 time everyday at 1:00am and will make
any required adjustment to the time setting.
The WAVE OK indicator and the antenna tower icon Y. appears on the display it the time
signal has been successfully received either automatically or after the manual pressing of the
WAVE button.
Important : Do not press any button or switch while signal reception operation is in progress.
Triggering a Receive operation Manually
You can trigger a signal reception operation at any time by pressing the WAVE button. This
causes the main unit to perform an immediate signal reception operation.
Unsuccessful Signal Reception
If you are unsuccessful in your attempt to receive a signal after you have installed batteries or
after you have activated the reset process, the base unit will continue to search for a signal.
The search for a signal every hour until the signal is received. M???
P5
Check IN / REMOTE Temperature
The indoor temperature is displayed on the INDOOR temperature field and the OUTDOOR
temperature will be displayed on the OUTDOOR temperature field.
Receiver stage indicator
The RF Temperature signal indicator in the main unit's outdoor temperature window will show
the following:
_ N0 SIGNAL DETECTION
SIGNAL DETECTION
“ SUCCESSFUL RECEPflON
Losing Synchronization of the wireless thermometer
if the main unit displayed a proper outdoor temperature in the past but now displays blan "--",
the remote unit and main unit may have lost synchronization. If this occurs, press the
RE-SYNC button of the main unit. The main unit will attempt outdoor temperature reception
for another 6 minutes and reinitiate synchronization with the remote unit. If the remote
temperature cannot be received, check.
1.The distance of the main unit or remote unit should be at least 3-4 feet away from any
interfering sources such as computer monitors or TV sets.
2. Avoid placing the main unit onto or in the immediate proximity of metal window frames.
3. Using other electrical products such as headphones or speakers operating on the same
signal frequency (433MHz) may prevent correct signal transmission and reception.
4. Neighbors using electrical devices operation on the 433MHz signal frequency can also
cause interference.
Note: When the 433MHz signals is received correctly, do not re-open the battery cover of
either the remote unit or the main unit, as the batteries may spring free from the contacts and
force a false reset. Should this happen accidentally then reset both unit (see Getting Started
above) otherwise transmission problems may occur.
The maximum transmission range is 100 feet from the remote unit to the main unit (in open
space). However. this depends on the surrounding environment and interference levels. The
temperature signal travels in a straight line from the remote unit to the clock. The signal will
not curve around blocking object. If no reception is possible despite the observation of these
factors, all units have to be reset (see Getting Started).
Interference
Signals from other household devices, such as entry controls, door bells and home security
systems, may temporarily interfere with the units and cause reception failure. This is normal
and does not affect the general performance of the product. The transmission and reception of
temperature reading will resume once the interference has stopped.
P.6
Manually Set the Clock
To Set Calendar and Time
1. Press and hold SET button to enter setting mode, upper LCD show year "2005" and blinks.
Press + or - button to set year, hold down + or - will accelerate setting in faster speed.
2. Press SET button again, 1M 1D blinks, press + or - button to set
month and date, hold down + or - will accelerate setting in faster speed.
3. Press SET button again, time digits blinks, press + or - button to set time in minutes, hold
down + or - will accelerate setting in faster speed.
4. Press SET button again, upper LCD shows 12H and blinks, press + or - button to select
12H or 24H.
5. Press SET button again to confirm time and calendar settings.
To Select "C or °F Temperature Reading
- Press °C/° F button to choose your desire temperature reading.
TroubleShooting / FAQ (Frequent Ask Questions)
o Press the “Reset" button when the clock is displaying irrelevant temperature reading. This
may happen when external noise is severe enough to interfere with the RF temperature
signal.
- Press the "Reset" button on the wireless transmitter if the readout is irrelevant or does not
respond.
There is no outdoor temperature shown on the unit
AzPress the re-sync button and the unit should show an outdoor temperature within minutes.
If no temperature is shown the remote unit is either too far away or there is some
interference between the remote and the main unit. Bring the remote unit to the main unit
and re-sync. There is also a reset button on the remote unit. Then move the remote unit
to a new location closer and in direct line with the main unit.
The outdoor temperature is reading 40°C/105’F when the temperature is in the 15°C/60°F
AzThe remote unit is in direct sunlight. Move it to a shaded protected area.
Care of your clock
- Avoid exposing your clock to extreme temperatures, water or severe shock.
Avoid contact with any corrosive materials such as perfume, alcohol or cleaning agents.
Do not subject the clock to excessive force, shock, dust, temperature or humidity, Any of
these conditions may shorten the life of the clock.
Do not tamper with any of the internal components of this clock. This will invalidate the
warranty and may cause damage.
The apparatus shall not be exposed to dripping or splashing and no objects filled with
liquids, such as vases, shall be placed on the apparatus.
M???
P.7
Correct usage of the batteries
' Use 2 new "AA" batteries for the remote unit and main body.
- Do not mix standard and rechargeable batteries
- Do not mix new and old batteries
- When the low battery mark " EX) " appears on the display, replace all batteries with new
ones.
Specification
Temperature measuring range
Receiver : -20°C to +70°C with 0.1°C resolution(-4°F to 158°F with 02°F resolution)
Transmitter : -50°C to +70°C with 0.1°C resolution(-58°F to 158°F with 02°F resolution)
Temperature checking interval
Receiver : every 32 seconds
Transmitter : every 16 seconds
Transmission distance: maximum 100 feet in open field, depending upon surrounding
structures, mounting location and possible interfering sources.
Power source ( Alkaline batteries recommended )
Receiver : 2 "AA" batteries, 1,5V batteries
Transmitter : 2 "AA" batteries, 1.5V batteries
Battery life : about 12 months
Warning : Changes or modifications to this unit not expressly approved by the party
responsible for compliance could void the user’s authority to operate the equipment.
Note : This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This
equipment generates, uses and can radiate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause harmful interference to radio
communications.
There is no guarantee that interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one of more of the following measures:
- Reorient or relocate the receiving antenna.
° Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver
is connected.
- Consult the dealer or an experienced radiofl‘ V technician for help.
Under the environment with radio frequency interference, the sample may malfunction and
require user to reset the sample.

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