Am 20.07.19 um 10:21 schrieb Frank Stellmach:
the B version has a 500MHz front end, copied from the HP5345A, with a
matched pair of amplifier / Schmitt trigger hybrids.
The A version has separate amplifier and Schmitt trigger ICs.
There were also changes on the trigger circuit.
Then the B version has a simplified µP board, has the OCXO
(10811-60111), which is a must for absolute T.I. and frequency
measurements.
My 5370A came with a 10811-60111 time base.
It also came with LOTS of intermittent contacts, but it was nearly for
free, so I can't complain.
I solved the contact problem by buying a SR620 that was still under cal. :-)
Gerhard
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