We have recently added a reset step to our tests that use the 53131a counter and every so often the counter returns a 2008 measurement interpolator calibration failed error during the subsequent setup of the counter. These resets were added between phase angle measurements and only seems to occur during phase angle measurements. These errors go away if I set :diag:cal:int:auto off. Or if I do a :diag:cal:int:auto once after the *rst. Does anybody know the cause of these errors? Is there a better solution to eliminate these errors.