Hi Basically when the modern era of network analyzer / standards calibrated devices came along, it was the end of most of these magic test sets with knobs and dials. The Saunders stuff lived on well into that era, mainly because it was relatively inexpensive and most of the calibration was simple to do. The conversion to what we would now call network analyzer techniques was well underway in the 1970’s. It took us quite a bit of work to get from there to where we are today.
The operating principle of the older magic boxes is fairly simple. Build up an oscillator circuit that can be switched around to run over a wide range of frequencies and impedances. It generally is a very poor oscillator, but that’s not the point. Come up with a way to “zero” it to a given impedance and frequency. Plug in crystals and see how they deviate in impedance and nominal frequency. Shove in a load capacitance change and note the frequency change. From that data, you can calculate the crystal parameters. To the degree all the stray this and that is nulled out, your data will be more or less accurate. Bob > On May 24, 2018, at 1:40 AM, Bernd Neubig <bneu...@t-online.de> wrote: > > Hello, > on the website of my company you can find a list of papers on the subject of > crystal measurement techniques. > http://www.axtal.com/English/TechnicalNotes/TechnicalArticlesPublications/LiteratureaboutQuartzCrystals/ > > The actual standard procedure for crystal measurement is by using modern > network analyzers with error correction, as given in the IEC publication > 60444-5. > A description of the method and its variants can be found in my 2012 paper > listed on the mentioned website. > Enjoy > > Bernd DK1AG > > > -----Ursprüngliche Nachricht----- > Von: time-nuts [mailto:time-nuts-boun...@febo.com] Im Auftrag von Brooke > Clarke > Gesendet: Mittwoch, 23. Mai 2018 20:13 > An: tim...@timeok.it; Discussion of precise time and frequency measurement > <time-nuts@febo.com> > Betreff: Re: [time-nuts] 5950 Crystal impedance meter manual > > Hi Luciano: > > I have some web pages about crystals and testing them: > http://www.prc68.com/I/CrystalImpedanceMeters.html - Crystal Impedance Meters > (Saunders 150) http://www.prc68.com/I/Xtal.shtml#TE - Crystals in general & > Test Equipment (see Trivia below) http://www.prc68.com/I/Xam.html - Crystal > Activity Meters http://www.prc68.com/I/Xec.shtml - Equivalent Circuit > http://www.prc68.com/I/4395A.shtml#ZT - The Z transform method is also used > in commercial crystal test sets like the HP E4915, E4916, E5100. > > Trivia: The HP 4194 may be the only instrument that can really characterize > watch crystals ( 32768 Hz) for impedance which is in the meg Ohms range. > Some of the HP network analyzers can fit swept frequency data into an > equivalent crystal equivalent circuit. > > -- > Have Fun, > > Brooke Clarke > http://www.PRC68.com > http://www.end2partygovernment.com/2012Issues.html > > -------- Original Message -------- >> Hi all, >> I found this Crystal Impedande Meter produced by RFL Industries inc, >> Boonton. >> I would like to understand how to use it and I do not have any >> documentation. >> I'm not even able to figure out if it works properly. >> I would like to ask you if someone owns the service/operating manual and >> can share it with me. >> Look at the picture thanks >> Luciano >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
