Tek 7000 Series Fixtures 067-0655-00 vs 067-0589-00 fixtures

We're running through the calibration on our 067-0587-10 Standardizers and they're failing frequency response. All points lead to the

067-0655-00 fixture going bad, which we only have one of. We tried to substitute the 067-0589-00 fixture in place of it and pull the + & - signals off of it, but the frequency response was even worse, on the order of -12% at points. What is the main difference between the 067-0655-00 and the 067-0589-00? The 0655 looks like they've spent significant effort shielding the pickoff points, and the 0589 has a little more unshielded coax showing. However, the flexible extender board has a similar amount of unshielded coax to the 0589 and seems to pass the signals just fine. Is it just the rolloff of the coax used in the 0589?

Are there any engineers out there that worked on the 7000's still around?

Thanks for any help,

Steve

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sck0006
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For anyone interested, the problem was indeed the jig. There is a "50 Ohm Follower" board that is built into the mainframe, and that is the primary difference between the 067-0655-00 and the 067-0589-00. We bypassed the jig by purchasing a used mainframe and pulling the coax signal lines to the outside of the scope body. It's sad to scrap a scope like that, but the jig cost ~$3000.00, and a used mainframe is $300 and has two voltage follower boards. Hope this helps someone, but I have a feeling there's not a whole lot of 7000 series mainframe calibration going on anymore.

Steve

Reply to
sck0006

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