G
In ASME/ANSI B89.1.10M there is no reference to a recommended, min or max calibration frequency. Some standards state a maximun allowable frequency. I set the frequency for dial indicators at 1 year (annually). Does it matter if an indicator is calibrated in February and set the next due date to say October of the next year? I have reviewed the calibration history (no failures) and reviewed the graph for each test point showing no major drift in either direction. Is this acceptable?