Seems like a zillion years ago, when I was young and dumb, I bought a used Phillips PM3212 25MHz triggered sweep dual trace scope from a vendor at the Trenton Computer Fair. I wasn't dumb enough for them though. They sold it without scope leads, so I found some bare copper wire and took it over to one of the buildings and plugged it in to check the channels. The whole thing was dead as a doornail. When I took it back to the vendor, he kindly took back the paperweight and gave me another. He had about 8 of them there for sale. This second one checked out and showed a nice square wave from the 1.2V calibration output. I don't know how accurate the waveform is, and 25 MHz doesn't sound like much, but it's fast enough to measure the speed of light in a small space (about 12 inches per nanosecond) and it's fast enough to be useful on most waveforms short of microwave. The main thing is, when you need an oscilloscope, you need an oscilloscope. Sometimes even an old recurrent weep dinosaur can save your bacon.
Mark Wendt wrote: > I recently became the proud papa of a Tektronix > 7623A O'scope, purchased off the Bay of E. It's a mainframe storage > scope, capable of handling three plugins - two vertical amps and a > horizontal timebase. I got that machine, a few different plugins, a > number of probes, and some other odds and ends for less than $500. It's > an analog scope, but in it's time, it was one of the high-end scopes > that Tek made, and it's still going strong even at close to 30 years of > age. > > This one is identical to the one I have: > > <www.ebay.com/itm/Tektronix-7623-Oscilloscope-Modules-and-Manuals-/230552776690> > > You can get better prices by waiting a bit. I got mine for $100 plus > shipping. > > A venerable high quality machine that you can use to help troubleshoot > problems like the ones that showed up in the Encoder thread. ------------------------------------------------------------------------------ Cloud Computing - Latest Buzzword or a Glimpse of the Future? This paper surveys cloud computing today: What are the benefits? Why are businesses embracing it? What are its payoffs and pitfalls? http://www.accelacomm.com/jaw/sdnl/114/51425149/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
