G'Day All, I just purchased a 2nd hand HP5370B counter. It was last calibrated in 2002 but fails the operators checks. I have run tests 1-21 and only a few fail. In step 13 the display indicates 90.9*ns In step 15 the std dev is 20.* to 16.*ns with a min of 90.9*ns and a max of 91.*ns In step 17 the stop period is 91.*ns and the start period is 8.91ns I have measured its ref output with another counter and it seems stable and 10MHz. So I am seeking ideas on where to start to fault find, any guidance would be much appreciated. Regards Scott
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