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I'm looking get get set up to be able to calibrate my own scopes. In reading the 485 manual a high frequency constant amplitude signal generator 100-350mhz is needed. If in the future I pick up a

I've found X-Y mode on a digital scope (TDS460A at least) to be extremely unsatisfying. It seems to be far from the sweet spot of what DSO's can do.

On Fri, 02 Mar 2018 18:39:11 +0000, you wrote: 3D printing can be a bit picky about settings. The smaller the layer setting the denser the part, and the more rugged it will be. Extruder temperature

I'd recommend just using almost any analog scope that has X-Y capability for display. For low frequencies including audio, the response of the V and H should be virtually identical - you can easily

Thanks for the extra info. I certainly wish I could peer over your shoulder, I'd probably learn a lot. A very cheap X-Y option right now is a 1720 vectorscope, if that has the bandwidth you need; it's

wrote: There are now services that'll demand-print and ship items, like e.g. ShapeWays, which will print in a variety of materials. It'd be nice to have a stash of 3D models for Tek replacement parts

Toby, Documentation is just a notebook, a few pics before disassembling anything important. Analog computers are two Comdyna GP-6. FWIW, the system could modeled in MatLab, Mathematica, or even

I'm curious about your analog computer. Are you documenting/blogging/video'ing this anywhere? What is the goal? I'm also working on circuits to drive X-Y displays, but at a very basic level since I'm

It is made on laser engraver. I have a friend that work on this machine and I make a corel with outlines and what need to be on scale. it is made from black PVC foil past on Plexiglass. First cut the

I have been refurbishing some late 70s-early 80s HP gear and I only replace bad capacitors per ESR or Q meter readings. A schematic helps in making sure there are no other elements in parallel that

The LO input to the mixer is also dead. It comes into the mixer through a cable/plug and it's still dead while unplugged. There are several test points on the LO circuit . The manual has a few

Sounds good. I terminated it with 600 ohms and now it's perfect. Thanks for pointing me in the right direction. Rick

Dennis' suggestion of using add and invert mode on the oscilloscope works well depending on how much sensitivity you need. If you have a 7000 mainframe, then a 7A13 combined with standard x1 probes

Dave, Thanks, yes a couple of them sold that would be just fine. Repair project is OK. I'm standing by and eventually I'll be providing one a new home and tlc. Either private party, hamfest, or the

To second Dennis, this is exactly what we do, and we’re a professional audio archive lab. George

Massdrop had one a week ago for $140. I was actually quite surprised to see such a specialized piece of equipment show up for sale there. If it's not available now, be patient, it'll come up again.

Dave- You might consider going to ham radio swap meets. A really great FET differential probe is the Tek P6046. I picked up one for less than $50 if I remember correctly and it is perfect. Many people

There were some selling very reasonably on eBay not too long ago; they still might be on there. Have you checked? Dave Casey (who is not currently selling any scopes on eBay)

Anyone have a Tek 503 that's looking for a new home? The 503's specs fit nicely as an output display for an analog computer project I'm working on. Or, perhaps there's a better, newer model the group

There is no such thing as a cheap differential probe. They have to be matched across a wide frequency range to have good CMRR. If you want a cheap CMRR the solution may be on your scope. All dual