n Mon, 25 Mar 2019 at 10:03, Tom Van Baak <t...@leapsecond.com> wrote:
> Some of you know that I'm a pack-rat for vintage instruments, books, > documentation, and publications about atomic clocks. Especially anything by > Hewlett-Packard. I've enjoyed all the time-nuts posting by Rick Karlquist > and Hugh Rice, et al. > /tvb > I generally find the old documents / manuals much more informative than the modern ones. To take just one example, I have an HP 16453A fixture that measured permittivity of dielectrics. https://www.keysight.com/en/pd-1000000508%3Aepsg%3Apro-pn-16453A/dielectric-material-test-fixture?cc=US&lc=eng I wanted to use it on an LCR meter, but its not so easy as the the plates are small, so finging capacitance can't be ignored. It is designed to work with instrument that have the firmware to handle it. There are no equations in the manual, nor any of the modern instruments designed for use with this. But if you look back at much older manuals, all the equations are there, which take into account the fringing field. For the last couple of decades at least, everything is considered interlectual property (IP) and is closely guarded by Keysight. But a search of older manuals, for equipment one does not own, often bears useful results. -- Dr David Kirkby Ph.D C.Eng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom. Registered in England and Wales as company number 08914892 https://www.kirkbymicrowave.co.uk/ Tel 01621-680100 / +44 1621-680100 _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
