An Alternate Method - Agilent Technologies 83620A Service Manual

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4. From the point of intersection, move horizontally to the left and read the
minimum calibration interval measured in days.

An Alternate Method

You can also determine the minimum calibration interval using the following
formula:
maximum allowable error
known aging rate (per day) = calibration interval in days
3-10 Adjustments HP 8360
10 MHz tandard