Video Resources

Frequency Tolerance & Stability

In this Quartz Resonators series video, we explore the concept of Frequency Tolerance and Frequency Stability.

To understand Tolerance and Stability we must first look at the quartz itself because the density and structure of Quartz varies with temperature. Frequency deviations occur as the temperature changes. By cutting the quartz at different angles you can optimize the Quartz blank to perform better in a specific application. For some of today’s most stringent applications that require high stability and wide temp ranges we would use an AT cut Crystal blank.

 The Frequency Tolerance of a crystal is defined as the allowable deviation from the specified Frequency when measured at 25 degrees Celsius or room temperature.

 The Frequency Stability is defined as the allowable deviation over the rated temperature range. Typically minus 40 degrees to 85 degrees Celsius.

 Something to remember is that Tolerance & Stability are cumulative when managing your accuracy budget. They are typically expressed in parts per million or sometimes as a percentage of the frequency.

 For instance, a crystal may be specified as having a frequency Tolerance of plus or minus 50 parts per million at 25 degrees Celsius and a frequency Stability of plus or minus 50 parts per million over a specified operating temperature. This would give the crystal an overall stability and tolerance budget of plus or minus 100 parts per million or .01% potential frequency error.

Watch the above video to learn more about Frequency Tolerance & Stability then click on the button below to start searching for the exact part you need!

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Please contact us if you need additional information or have a specific requirement in your application.

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Founded in 1980, ECS Inc. International has grown to become one of the most recognized and experienced manufacturers of frequency control management products in the world.
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