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Is long term stability non-cumulative?

Thread Summary

The user inquired about the non-cumulative nature of the long-term stability specification (80 ppm/1000Hrs) for the MAX 6165 voltage reference. The final answer confirms that long-term drift is non-cumulative, with the rate of drift decreasing over time. The primary cause of drift is mechanical stress, and AN-82 provides additional information on this topic.
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Category: Datasheet/Specs
Product Number: MAX6165

According to the datasheet, long term stability of MAX 6165 is 80 ppm/1000Hrs. Is that non-cumulative? Datasheets for equivalent products normally state that the long term stability spec is non-cumulative.

There is a long-term drift plot on the datasheet which suggests it is non-cumulative, but that plot can only be for one-off product so it is insufficient to draw conclusions.

This is a very important specification for us. Thanks very much.