[time-nuts] 5950 Crystal impedance meter manual
kb8tq at n1k.org
Thu May 24 10:20:51 EDT 2018
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.
> On May 24, 2018, at 1:40 AM, Bernd Neubig <BNeubig at t-online.de> wrote:
> on the website of my company you can find a list of papers on the subject of crystal measurement techniques.
> 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.
> Bernd DK1AG
> -----Ursprüngliche Nachricht-----
> Von: time-nuts [mailto:time-nuts-bounces at febo.com] Im Auftrag von Brooke Clarke
> Gesendet: Mittwoch, 23. Mai 2018 20:13
> An: timeok at timeok.it; Discussion of precise time and frequency measurement <time-nuts at 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
> -------- 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
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