B&B Electronics PCRTC manual Aging

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Aging

All crystal oscillators have an aging characteristic. The crystal used in the PCRTC uses the coldweld manufacturing technique, which exhibits the lowest aging characteristic of 1 ppm/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 Timeset or another method.

Documentation Number PCRTC2095 Manual

13

B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350

PH (815) 433-5100 -- FAX (815) 433-5105

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Contents Electronics Mfg. Co. Inc Designed and Manufactured Ottawa, IllinoisInternet Table of Contents Packing List SpecificationsGeneral Information IntroductionHardware Setup SetupSoftware Setup Hardware InstallationUsing the Device Driver OperationOverview Setting the Pcrtc Time and Date Command Line OptionsProgramming with the Pcrtc Replacing the batteryStartRTCAPI BatteryRTCWord GetRTCTimeLastPowerDownRTC Pascal Programming Example QuickBASIC ExampleProgramming Example Calculating Error Oscillator ErrorPPM Terminology Aging Map of XT Class Machines Appendix A. Hardware I/O MapHardware I/O Map of AT Class Machines
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