Shahriar of The Signal Path Blog posted a YouTube video a few months ago about a Fluke PM6680B frequency counter that he has in his lab. He performed a successful repair on the counter in that episode and got it fully operational. The unit was equipped with the stock XO timebase, however, that did not provide the necessary stability for a counter of that resolution.
I sent him one of my PM66xx OCXO upgrade boards for his unit. Check out his video where he installs and tests the board in his counter.
This upgrade board is shared as open source hardware. If you have a compatible counter and would like to make your own, check out my write-up here.
Great, Dan. Shahriar was obviously pleased.
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