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Re: 5111A Horizontal BW limit.


 

Not really. The scope isn't the only thing with limited bandwidth.

But I did pick up an interesting scope I'd found at a local surplus store this past spring. It's from an eBay seller I've bought from before, and he showed me a collection of Tek gear he didn't have listed. As I needed another 5A18N, and this 5113 had one, I called him to see if he still had it. He did and we negotiated a fair price. So I've acquired a new toy, and have two pairs of matching 5100 series vertical amplifiers now. Useful for calibration. I've also created more work for myself.

As part of checking it out after I'd retrieved it Thursday afternoon I checked its horizontal bandwidth with the 5A18N I'd already calibrated. Did I really measure 3MHz BW? That's just a tad less than the BW I measured for the 5A18N itself. I realized that between the new 5113 and the 5111A I merely need to choose which one to keep.

Between the 5111A and 5113 the 5111A is in better condition, but I realized they share a common interface/plug-in module. I'll tear down the 5111As interface board and see if I can find why it's falling short. I'll also try swapping in the 5113 plug-in chassis to ensure that it fixes the BW limit. Though they both have the same base 333-1425-xx part number, I want to study them further to ensure they are interchangeable. The 5111A is 333-1425-11 and the 5113 is 333-1425-08.

If I find the cause I'll update the thread.

Hope you're all having a great Christmas!
Dave

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