Thread: 8640b problem
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Ancient_Hacker Ancient_Hacker is offline
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Default 8640b problem

wrote:

The readout seems to work correctly, the frequency is accurate and it
isn't intermittent. It seems like the error amplifier is calculating
too high an error and overcorrecting, causing the frequency to drift
until it is no longer phase locked.


I've seen a high failure rate of the MECL IC's under the right circuit
board-- they normally run quite hot, which might have cut their life.
I wouldnt be surprised if the problem is in there.

If you have another 8640B you might try narrowing down the problem by
swapping those three boards in that area.

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