LED Digital Wall Clocks, Master Clocks, Radio Controlled Atomic Clocks for Schools, Hospitals, Business and Other Commercial Applications

"BRG Precision Products"-Clocks


Frequently Asked Questions about Digital Clocks

  1. Q. Must I run synchronization wires between clocks?

    A. No. While we do manufacture wire sync configurations, we also manufacture clocks that are synchronized to the master clock over the existing power line. An ethernet option is also available that allows clocks to be connected to the existing computer network. This eliminates, or greatly reduces the need to run any new wires. Ultra-High Precision clocks do not require sync wire or a master clock.
  2. Q. How do the clocks receive their power?

    A. The digital clocks include an 110 VAC Adapter. Ceiling and wall clocks include an internal AC transformer. Many other power configurations are available, including international power supplies.
  3. Q. What is the approximate viewing distance for digital clocks?

    A. Digit size and approximate visibility as follows:

    Digit Size Visibility
    1.8" 40-75 Feet
    2.5" 75-150 Feet
    4.0" 125-250 Feet (high-bright model)
    4.0" 250-350 Feet (ultra-bright model)
    7.0" 300-400 Feet (high-bright model)
    7.0" 400-600 Feet (ultra-bright model)
    12.0" 600-800 Feet (ultra-bright model)
    18.0" 800-1,000 Feet (ultra-bright model)
    24.0" 1,000-1,200 Feet (ultra-bright model)

  4. Q. How are double sided clocks mounted?

    A. Specify either wall or ceiling mount. If ceiling mount, include the distance from the ceiling.
  5. Q. How do we synchronize the clocks so they all display the same time?

    One way is to wire all clocks together. Another method is power line communications which uses the existing power line to synchronize the clocks. Connecting clocks to the existing ethernet computer network is another available option. These methods will allow all clocks to display the same time; however, to be sure they all display the correct time, at least one clock needs to obtain time from the U.S. atomic clock. GPS and CDMA atomic time receivers are available for this purpose.
  6. Q. If I run sync wire, what kind of wiring and distance do I need with master system?

    . A single twisted pair, low voltage, up to 4,000 Ft. may be used. An almost unlimited distance is possible by configuring clocks to repeat the sync signal.
  7. Q. How many clocks can I run on a system, and can I mix types of clocks (digital and analog)?

    An unlimited number of clocks of various sizes can be connected to a single system. However, the sync signal should be repeated every ten clocks. Any clock can be configured with sync input and output to repeat the sync signal. When using power line communications, there is no limit to the number of slave clocks. A digital master clock may drive any number of digital and analog clocks. Power Line and Ethernet sync options have not limit on the number of clocks.
  8. Q. What is battery back up?

    A. When the power fails, the display is blanked while the battery maintains the internal time for about ten years. When the power is restored, the correct time will display immediately. All control parameters are stored in nonvolatile memory that does not rely on power.
  9. Q. How does my Time Zone clock get lettered?

    A. Lettering is white vinyl and you specify reading left to right. The lettering may be removed at a later date if necessary. Optional removable lettering is available; however, because of the glossy holder, they are not as attractive as the vinyl lettering. Digital lettering is also available. This lettering used 16 segment alpha LED digits that can be changed at any time
  10. B. How do I set my elapsed timer?

    The timer can be configured from the optional wired control box, buttons located on the back of the clock, or by connecting to optional control lines.
  11. Q. How accurate are digital clocks?

    A. GPS and CDMA atomic clock synchronization provides about one thousandth of a second accuracy. Stand alone clocks, using the internal correction register and temperature compensation, can achieve an accuracy of about 3 seconds per year.


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800 W. Liberty
Medina, Ohio 44256