The Guildline 4410 technical manual can now be found on Didier's website ( http://www.ko4bb.com/manuals/). Look in the Recent Uploads folder until Didier gets it moved around.
On Wed, Aug 13, 2014 at 3:26 AM, roman's ebay <[email protected]> wrote: > Hi All > Newcomer to the list. Been watching it since I came across it about a month > ago. Didn't realise that I wasn't the ONLY person in the world obsessed > with > having an accurate volt in my back yard for no reason other than that I > can.....:-) > > This discussion about the Statronics VS4 particularly got my interest. I > have one courtesy of fleabay about 4 years ago, for the princely sum of $20 > plus delivery (mine was the only bid, which (together with the quad > Standard > Cell box for about the same) is why I thought I was alone...). The VS4 > (and > indeed the Standard Cell Box) appears to work very well and all outputs > have > maintained their relativity over that time within the limits of my > measurement patience, even after about a year powered down after I moved > house. Plan to start doing some serious tracking real soon now. > > Each of the 4 independent cells in the VS4 consist of 8 selected, matched > and aged LM329s with matched resistors (all off the same reel of Evanohm, > selected mica cards, etc), low drift amps etc all contained in a controlled > oven. The Statronics stability spec is -2 +-2ppm per year (after year one). > The unit was conceived and designed by the CSIRO who run (or at least ran) > the Australian National Measurement Laboratory, so I would guess that the > spec is conservative. If Will is correct about the Gould 4410/Fluke 732A, > these must be pretty good devices. I suspect I won't get one of them for > $20! > > I saw Ben's question about the manual, and Tom's response about the 100 > page > masters thesis. That would be interesting to read! I have a copy of the > Statronics VS4 Instruction Manual Issue 2 which is only about 70 pages, > half > of which is a treatise on statistical intercomparisons and a HP-85 Basic > program. But the first 38 pages contain what I would expect - user > instructions, design descriptions, schematics, etc. Unfortunately, I don't > have an electronic copy, nor ready access to a scanner. > > Ben, I note you are in Australia. Whereabouts? I am in Adelaide. Maybe I > can > get the hard copy to you some way. > > Roman > > > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of Will > Sent: Tuesday, 12 August 2014 5:40 PM > To: Discussion of precise voltage measurement > Subject: Re: [volt-nuts] Voltage standard spotted for sale, 4410 > > 2014-08-12 1:25 UTC+03.00, Tom Knox <[email protected]>: > > I am not sure the use of LM329's was a cost saving measure or > > compromise, actually the 4410 uses a different approch, it's basicly is a > big oven. > > Guildline has been a Metrology leader for decades and has been a > > leader including temp measurements and oil baths so I for one would > > be interested in how well their approach to a voltage standard performs. > > The 4410 was not designed or manufactured by Guildline. Just like many of > the products sold under their brand name. > > At the time of design the LTZ1000 was not yet available and the Fluke ref > amp was obviously property of Fluke only. The only same level technology > available to all manufactueres was the 1N829 zener which if carefully > selected and matched can be as good as LTZ1000. Datron calibrators with > multiple selected, aged and matched 1N829 zeners are a good example of > that. > > The original 100 page (Statronics) documentation seems to be a masters > thesis rather than a product manual and has a detailed description of the > design process. The text mentions that the 1N829 temperature compensated > zeners were discarded because of the poor availability in Australia where > the unit was developed. The LM399/LM329 series was selected because it was > the "best available". Band-gap type references were also evaluated but > found > unsatisfactory at the early stage. > _______________________________________________ > volt-nuts mailing list -- [email protected] To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > > _______________________________________________ > volt-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
