[time-nuts] HP 5370, 5371, 5372, 5373

[Stewart Cobb]

This list has a lot of discussion of HP 5370 time-interval counters,
including the BeagleBone CPU upgrade. The usual sources seem to have HP
5371, 5372, and 5373 units available as well. From the profession of model
numbers, and the cosmetics of the front panels, one might assume that these
are successor units to the 5370.

Are they actually successor units? Are they upward-compatible with the
5370?   Are they more accurate, or less accurate?  Is there anything that a
5370 can do that the later units can't?

Cheers!
--Stu