Standard Reference Labs Trancells: any information available? - Page 1
Forum section: electronics / general

author: tggzzz
author_rank: Super Contributor
timestamp: February 12, 2017, 09:58:10 am
content: I've just taken a punt and bought a couple of 10V sources for small change - but I haven't fetched them yet.The only info I have is that one is a main-powered "Standard Reference Labs VTS-5/10-A-2", and the "Standard Reference Labs TC01" is powered from 28V.Is there is any information available, and/or any hints and tips as to how to use/abuse/recondition them?Thanks

author: Vgkid
author_rank: Super Contributor
timestamp: February 12, 2017, 10:45:18 am
content: Unfortunately no model info can be found. I tried looking in detail a few years ago, and a quick search just now. Look into Kenneth Koep, he did some work with nist/nbs.I was buying 10v supply(not a precision one), but it ended up getting stolen from the dealer.

author: tggzzz
author_rank: Super Contributor
timestamp: February 12, 2017, 11:27:41 am
content: Drat.I'd seen the name "Koep" in conjunction with Trancell, but haven't worked out the actual connection.Drat again

author: Vgkid
author_rank: Super Contributor
timestamp: February 13, 2017, 07:03:42 am
content: This is the closest to any koep manual.http://www.ko4bb.com/getsimple/index.php?id=download&file=06_Misc_Test_Equipment/Standard_Reference_Labs_VTS4007_Operation_Manual.pdfWhen you get it, take a lot of pictures.

author: manganin
author_rank: Regular Contributor
timestamp: February 13, 2017, 01:34:19 pm
content: Quote from: tggzzz on February 12, 2017, 09:58:10 amAs far as I know all the Koep / SRL units were built around a selected zener (~1N829) and the well known circuit.They also sold the diodes individually under their own brand and part numbers. If money was not an issue, TC less than 1 ppm/C, stability 5 ppm/year and rms noise level 0,08 ppm guaranteed.

author: tggzzz
author_rank: Super Contributor
timestamp: February 13, 2017, 01:59:28 pm
content: Quote from: Vgkid on February 13, 2017, 07:03:42 amWhy didn'tIfind that? Sigh, sometimes I irritate myself.QuoteOther than geek porn, in order to show what?The auction pictures are attached.

author: ManateeMafia
author_rank: Frequent Contributor
timestamp: February 13, 2017, 02:40:43 pm
content: I have a triple output Koep reference. I got that original document linked above and uploaded it a while ago.Inside my unit, all references are potted and have wires that come out to the front panel. Not a lot to see. They are not isolated as they share the same common.Behind the faceplate of the inner shielded enclosure was dry rotted foam. It is certainly worth a look to make sure some hidden mess isn't floating around inside the box.

author: Kilrah
author_rank: Unknown
timestamp: February 13, 2017, 02:42:53 pm
content: Quote from: tggzzz on February 13, 2017, 01:59:28 pmPretty sure he was referring to the innards/construction.

author: tggzzz
author_rank: Super Contributor
timestamp: February 13, 2017, 03:10:15 pm
content: Quote from: ManateeMafia on February 13, 2017, 02:40:43 pmVery decent of you; thanks.Yes.Indeed. Maybe there is an old battery inside, hopefully intact.