Why bother, you can replace the entire box apart from the input signal
conditioning with an FPGA and a pair of high resolution time interval
interpolators (eg 2 ADCs per interpolator, or a TAC circuit like those
used by Wavecrest.).
Bruce
Demian Martin wrote:
I got an almost perfect 5370A some years ago for less than $100. It had one
dead input. I discovered that those input devices were essentially
unobtanium so I went shopping for a substitute. I found a Maxim chip that
seems to work as well as the original comparator, possibly slightly better.
I also found that the input was not very easy to work with. However the time
interval probes HP 5363a or b (pretty easily available) address the input
flexibility issues very well and seem to talk to the inputs better than I
can directly. Its output seems to be an ecl signal.
Is there anything a 5370B can do that the A version can't? It seems the
major upgrade is the processor, the timer circuits seem essentially the
same. In fact this suggests some enterprising time nut could design a new
processor taking advantage of much faster and cheaper new processor chips to
improve the throughput considerably and could sell the upgrade to all of us
with 5370's. I would not be surprised if a PIC could do the task. . .
Demian
Date: Tue, 9 Mar 2010 16:56:41 -0500
From: "Bob Camp"<[email protected]>
Subject: Re: [time-nuts] 5370A vs 5370B
To: "'Discussion of precise time and frequency measurement'"
<[email protected]>
Message-ID:<[email protected]>
Content-Type: text/plain; charset="us-ascii"
Hi
Assuming there's enough of the pot left, (as in the pot still works) that's
very likely what I'll do.
Bob
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