On Wed, 19 Dec 2012 07:11:45 -0800 (PST), George Herold <gherold@teachspin.com> wrote:>On Dec 18, 9:45�pm, Jon Kirwan <j...@infinitefactors.org> wrote: >> <snip> >> I agree that it could sell for the cost of a scope -- >> depending on what is included. For example, it may provide >> alternate functions (signal generator?) which later have >> practical use, as well. And especially with a nice manual. > >Well that's fine too... If you want to grow it into something >bigger. >We also have a use for function generators that go below a few Hz. >We resell these protek function generators, which leave a bit of a bad >taste in my mouth. There is a six or seven digit frequency display, >the last few digits of which are meaningless, you change the freq. >from 1.00000 kHz to 1.00001 kHz on the display, but nothing changes at >the output. ><snip>Take a look at this: http://www.ebay.com/itm/130815250956 The idea adds value. If it included an input for a 10MHz reference, too... Anyway, still throwing ideas together and thinking. Jon
are all the function generators gone?
Started by ●December 12, 2012
Reply by ●December 22, 20122012-12-22
Reply by ●December 22, 20122012-12-22
On Sat, 22 Dec 2012 15:04:03 -0800, Jon Kirwan <jonk@infinitefactors.org> wrote:>On Wed, 19 Dec 2012 07:11:45 -0800 (PST), George Herold ><gherold@teachspin.com> wrote: > >>On Dec 18, 9:45�pm, Jon Kirwan <j...@infinitefactors.org> wrote: >>> <snip> >>> I agree that it could sell for the cost of a scope -- >>> depending on what is included. For example, it may provide >>> alternate functions (signal generator?) which later have >>> practical use, as well. And especially with a nice manual. >> >>Well that's fine too... If you want to grow it into something >>bigger. >>We also have a use for function generators that go below a few Hz. >>We resell these protek function generators, which leave a bit of a bad >>taste in my mouth. There is a six or seven digit frequency display, >>the last few digits of which are meaningless, you change the freq. >>from 1.00000 kHz to 1.00001 kHz on the display, but nothing changes at >>the output. >><snip> > >Take a look at this: > > http://www.ebay.com/itm/130815250956 > >The idea adds value. If it included an input for a 10MHz >reference, too...Digital scopes don't need timebase checking, and DC is good enough for checking the vertical.> >Anyway, still throwing ideas together and thinking. > >JonI think I met that swap-meet scope guy. I wanted to buy a scope and he said it worked. I offered him a check with the understanding that I'd stop payment if it didn't work. He refused. Another swap-meet trick. If somebody says "I don't know if it works", then it doesn't. But ebay has mostly killed the electronic flea markets. Most ebay stuff *does* work. -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
Reply by ●December 22, 20122012-12-22
On Sat, 22 Dec 2012 15:34:34 -0800, John Larkin <jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:>On Sat, 22 Dec 2012 15:04:03 -0800, Jon Kirwan <jonk@infinitefactors.org> wrote: > >>On Wed, 19 Dec 2012 07:11:45 -0800 (PST), George Herold >><gherold@teachspin.com> wrote: >> >>>On Dec 18, 9:45�pm, Jon Kirwan <j...@infinitefactors.org> wrote: >>>> <snip> >>>> I agree that it could sell for the cost of a scope -- >>>> depending on what is included. For example, it may provide >>>> alternate functions (signal generator?) which later have >>>> practical use, as well. And especially with a nice manual. >>> >>>Well that's fine too... If you want to grow it into something >>>bigger. >>>We also have a use for function generators that go below a few Hz. >>>We resell these protek function generators, which leave a bit of a bad >>>taste in my mouth. There is a six or seven digit frequency display, >>>the last few digits of which are meaningless, you change the freq. >>>from 1.00000 kHz to 1.00001 kHz on the display, but nothing changes at >>>the output. >>><snip> >> >>Take a look at this: >> >> http://www.ebay.com/itm/130815250956 >> >>The idea adds value. If it included an input for a 10MHz >>reference, too... > >Digital scopes don't need timebase checking, and DC is good enough for checking >the vertical.I think George wasn't thinking of excluding training on analog scopes. Whether or not a replacement design chooses to consider them is another matter, of course. But since a new design is still in the research stage, everything is on the table so to speak, I think.>>Anyway, still throwing ideas together and thinking. >> >>Jon > >I think I met that swap-meet scope guy. I wanted to buy a scope and he said it >worked. I offered him a check with the understanding that I'd stop payment if it >didn't work. He refused. > >Another swap-meet trick. If somebody says "I don't know if it works", then it >doesn't. > >But ebay has mostly killed the electronic flea markets. Most ebay stuff *does* >work.In case others might wonder what you are referring to and haven't read the ebay link, the ebay seller (Reed Dickinson) writes this about his experience with swap meets: I recently attended the bi-monthly electronics swap meet in Santa Ana, CA. There was an out-of-state vendor there who had a number of Tektronix 475A and 485 oscilloscopes that were very reasonably priced. The vendor assured me that all of these oscilloscopes were in working order; however, there was no power available to verify this statement. I accepted this explanation and after several minutes of intense haggling we arrived at a mutually agreeable price and then I was the proud owner of four 485 and three 475A Tektronix oscilloscopes. During the next week I fired them up and found that only two of the 475A's and none of the 485's had a trace visible on them. One of the 485's was lacking the inverter board and as well had no tunnel diodes nor any of the socketed ICs. Needless to say, I was not a happy shopper. And to top it all off, I did not get the seller's contact information. I decided that I needed a portable calibration tester and a very long extension cord. I do not design extension cords but I do design portable testers; the Pyramid Generator is the culmination of that effort. Jon
Reply by ●December 27, 20122012-12-27
On Sat, 22 Dec 2012 15:34:34 -0800, John Larkin <jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:> >>The idea adds value. If it included an input for a 10MHz >>reference, too... > >Digital scopes don't need timebase checking, and DC is good enough for =checking>the vertical. > >>Tha is not correct. ADC dynamics do not permit this to be true. Talk with your test people before responding. ?-)
Reply by ●January 5, 20132013-01-05
Jon Kirwan a �crit :> On Wed, 19 Dec 2012 17:33:41 +0100, Fred Bartoli <" "> wrote: > >> Jon Kirwan a �crit : >> <...> >>> I've also a 3D printer that was build earlier this year and >>> is working nicely. I considered a proto from that, as well. >>> >> Jon, >> which 3Dprinter is it? A DIY one? (URL?) >> How much effort and money did you put in it? >< snip then detailed answer> Thanks a bunch. -- Thanks, Fred.
Reply by ●January 5, 20132013-01-05
On Sat, 05 Jan 2013 21:08:25 +0100, Fred Bartoli <" "> wrote:>Jon Kirwan a �crit : >> On Wed, 19 Dec 2012 17:33:41 +0100, Fred Bartoli <" "> wrote: >> >>> Jon Kirwan a �crit : >>> <...> >>>> I've also a 3D printer that was build earlier this year and >>>> is working nicely. I considered a proto from that, as well. >>>> >>> Jon, >>> which 3Dprinter is it? A DIY one? (URL?) >>> How much effort and money did you put in it? >> > >< snip then detailed answer> > >Thanks a bunch.A lot more than you'd bargained for, eh? Jon
