Tek TDS 744A -> TDS 784A upgrade hack!

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Nice.

I see that you had to go 34 years into the future to get that screen shot - do we all have to wait that long?

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kevin

Yeah, SD-24 is a fabulous pulse generator. Well, the rising edge is fabulous; the falling edge isn't.

I've always been ahead of my time. ;)

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Cheers

Phil

You're welcome. I've done this on a number of TDS700 scopes that I've sold, and never had any complaints about step response, although I don't have a fancy SD-24 like some folks do to test it. ;)

I run the Tek field adjustment software to calibrate it, though. I'm guessing that you didn't?

PS: I'm not the right guy to repair your HP 3585A, I don't work on those ancient boat anchors anymore and I tossed all my service info on all that stuff years ago. I do know a guy in Texas that might be, and he has a climate-controller cal lab in his house with a 3458A and lots of other good stuff. If you want his contact info, let me know.

Lastly, I do have lots of hacks for scopes, but only ones newer than 1995 or so; nothing on your list, sorry.

One other thing, Phil, did you get a capture before the operation by any chance?

Not so far. It seems to require ancient hardware that I don't have. It passes the frequency response self test, and there aren't a lot of edge artifacts due to the interleaving being off, so I'll probably just leave it alone.

The 3585A is a nice instrument for low frequency stuff. What I really want is a 100 MHz bandwidth dynamic signal analyzer. I'll try digging out my 70820A and see what it can do--it has a 40-GHz sampling front end and a 10-MHz instantaneous bandwidth FFT back end.

Well, one of these days my ship will come in. ;)

Cheers

Phil Hobbs

Nope, but it was a bit under a nanosecond.

Cheers

Phil Hobbs