FAQ
Home Download Order  
¡¡

Up
Products
Specials
Site Map
Support
Tech Info
Contact

 

Models
Comparison
Specifications
Advanced
FAQ
Installation
Operation
Troubleshooting
Index

 

 

 

 

 

 

 
ClockCard Frequently Asked Questions 

Related Links

    ClockCard Main Page
    ClockCard Product Index


What are the different ways I can use ClockCard?

  • To replace the motherboard clock
  • To fix a bad clock or battery
  • To retro-fit a DOS system (ISA version)
  • As a stable time source for Windows 95/98/Me/NT/2000
  • As the first-level time standard in a two-level system

How does ClockCard work?

The ClockCard board resets the motherboard RTC (Real Time Clock) chip with the correct time and date each time the PC is booted. This process occurs automatically before DOS or Windows has been loaded, and cannot be disabled or bypassed by the user. No software needs to be loaded or installed for this process to happen. For  more detailed information see the  Technical Overview or  board level information.

Back to top of page


How accurate is ClockCard?

The precision of the ClockCard is entirely dependent on the quality of the oscillator circuit. There are three sources of error in the oscillator:  (1) calibration error, (2) temperature stability, and (3) aging.  Understanding these will allow you to estimate the precision of the ClockCard in your application.

For simplicity we will measure error in terms of PPM (parts per million).  The unit PPM provides a number similar to error expressed with percentages, but reduces the number of decimal places required. For example, 0.001% converts to 0.00001which is equivalent to 10 PPM. Using the PPM notation makes it easier to deal with very small deviations.

The PPM terminology is also useful for calculating ClockCard error in terms of seconds per month. Since an average month has approximately 2.63 million seconds, if the ClockCard error was 2 PPM, then total error for the month would be 2 x 2.63 = 5.26 seconds.

Calibration error:  The ClockCard oscillator is calibrated at the factory to within 1 PPM part per million) of its specified frequency at room temperature (23?C or 73?/b> F).

Temperature Stability:  The frequency of oscillation of crystal oscillators is highly dependent on temperature. The oscillator used in the ClockCard has an extremely low temperature dependency of 5 PPM from 0?C to 50?C (32?/b> F to 122?F).  Since the oscillator is calibrated to 1 PPM at room temperature (23 ?/b>C), it will only exhibit 1 PPM error if its environment is held to this temperature. The worst case condition is if the temperature of the ClockCard is held at one of the extremes, 0 or 50 ?/b>C. At these points, there will be an error of 5 PPM. If the temperature variation covers a smaller span, less error will be exhibited. The oscillator in the PCI version is temperature compensated.

Aging:  All crystal oscillators have an aging characteristic. The crystal used in the ClockCard uses the coldweld manufacturing technique, which exhibits the lowest aging characteristic of 1 PPM per year.  In practice, this aging rate improves significantly with time, but for practical purposes the value of 1 PPM is adequate.

To estimate the error in your application, sum the error from the three sources above. This estimate can be used to determine how frequently the time should be updated using Beagle Software's ClockWatch or another method.

ClockCard Technical Specifications

Back to top of page


How does the ClockWatch software work with ClockCard?

ClockWatch is Beagle Software's time synchronization software utility that allows you to set your computer¡¯s clock to the atomic clock over the Internet.  

With ClockCard and ClockWatch installed you have two ways of maintaining the correct time:

  • ClockWatch makes periodic checks over the Internet to verify that the computer¡¯s clock is correct.  If a time change is necessary it sets both the operating system and the ClockCard clocks. This method is the most accurate but involves communicating with external timeservers.
  • ClockCard performs as your computer's correct time source. ClockWatch checks ClockCard periodically (at a set interval), performs an external time check to the atomic clock, then updates the operating system and ClockCard. 

ClockWatch can be configured to use an external timeserver, ClockCard or both. For more information see:

More information on Using ClockCard with ClockWatch.

Back to top of page


Does ClockCard work in DOS computers?

ClockCard ISA will work in DOS on most PC-compatible computers with Intel architecture.  The optional ClockWatch software for ClockCard works only on Windows 95/98/Me/NT/2000.

ClockCard PCI also comes with MS-DOS drivers.

Back to top of page


Do you have a version for Linux or Unix?

ClockCard PCI has driver source code available for Linux 2.3+. Drivers are also available for Unix. A software development kit (SDK) for ClockCard is also available. Please contact Beagle Software for more information.  

Beagle Software's Time Sync Products for Linux and UNIX

Back to top of page


How do I install ClockCard?

What settings do I need to make when installing ClockCard?

The required settings depend on your existing computer set-up.  Refer to ClockCard installation for information on assessing your configuration and installing ClockCard.

Back to top of page


Why won't my computer won't keep time when shut off?

Two time-of-day clocks reside in every personal computer.  These clocks go by several different names, but for simplicity, we'll call them the software and hardware clocks. The software clock runs only when the computer is turned on. It stops when the computer is turned off. The hardware clock uses a battery and runs even while the computer is turned off.

Your computer has problems keeping time when shut because the hardware clock is under-performing. The accuracy of the hardware clock is determined by the quality of its time base oscillator (typically a 32.768 kHz crystal). These crystals offer only marginal timekeeping performance. They are sensitive to temperature and other factors and are often not calibrated at the factory. Even under the best conditions, these oscillators are not likely to be stable to better than about 0.1 seconds per day. 

More information on PC clocks.

Back to top of page


Will this card solve any 'jumping' year and date or Y2K problems?

Yes.  As part of its time keeping functions, ClockCard will upgrade computers with non-Y2K compliant clocks. Computers that are experiencing large, unexplained jumps in time or date should consider the ClockCard PCI Sentry card which monitors date and time to prevent large changes in date or time due to errant programs, faulty hardware or tampering. More information on clock locking.

More information on resolving Y2K problems with ClockCard


My motherboard BIOS battery isn't working. Will this replace it?

The answer is yes and no. The computer's battery provides power for the BIOS settings when the computer is powered down. The BIOS includes a date and time clock that keeps time when the computer isn't running. The real time clock in ClockCard uses its own battery power when the computer is off. This maintains the time but does not supply battery power to retain BIOS settings.

Back to top of page


  Products | Specials | Site Map | Support | Tech Info | Contact
Copyright © 2004 Beagle Software. All rights reserved
Last reviewed September 13, 2004