ESI SR 1050 100K transfer standard, some inside pictures. - Page 1
Forum section: electronics / general

author: lowimpedance
author_rank: Super Contributor
timestamp: September 12, 2016, 06:30:37 am
content: Thought the following pictures of the inside of an earlier manufactured SR 1050 might be of interest after looking at this thread ;https://www.eevblog.com/forum/metrology/esi-resitance-standard-sr1010-and-standard-resistor-sr104/and seeing some pics of an ESI with bobbin style resistors and what IET have done!.and yes I was veerrrry careful not to touch anything ! as much as all that sparkly gold invites one too.

author: lowimpedance
author_rank: Super Contributor
timestamp: September 12, 2016, 06:32:40 am
content: a few pore pics.

author: lowimpedance
author_rank: Super Contributor
timestamp: September 12, 2016, 06:34:27 am
content: and lastly some catalogue info. from ESI Metrology catalogue number 7 1974.

author: daqq
author_rank: Super Contributor
timestamp: September 12, 2016, 08:11:34 am
content: Nice! Thanks!

author: zlymex
author_rank: Frequent Contributor
timestamp: September 12, 2016, 08:12:31 am
content: Thanks very much for the inside photos.I don't like the way that esi trim those mica resistors at all especially the resistance is very high.

author: quarks
author_rank: Frequent Contributor
timestamp: September 12, 2016, 10:17:04 am
content: Many thanks for sharing

author: Vgkid
author_rank: Super Contributor
timestamp: September 12, 2016, 02:08:22 pm
content: Thanks for the teardown. Loving those switches, they are impressive.

author: zlymex
author_rank: Frequent Contributor
timestamp: September 12, 2016, 02:24:58 pm
content: Speaking of those switches, the insulation tips of three switches of my SR1050(10M per step) were broken. I replaced them with PTEE tube.I wonder if it was accidental or something common that esi should recall:P

author: TiN
author_rank: Super Contributor
timestamp: September 12, 2016, 04:17:56 pm
content: Nice resistor, thanks!

author: zlymex
author_rank: Frequent Contributor
timestamp: September 13, 2016, 01:25:19 am
content: Quote from: DiligentMinds.com on September 12, 2016, 05:17:40 pmThree of my top plastic handles were missing too(2 black 1 white), and one metal handle rod is bent(shown on above photo).Although esi use this kind of switch on other instruments as power switches(such as 242D), I haven't found it anywhere else.Edit I saw a photo of an SR1050 with three broken handles on ebay. Looking at the snapped off part of the switches, it seems to be the inner core is made from something other than metal which could probably drilled off and replace with new ones.

author: lowimpedance
author_rank: Super Contributor
timestamp: September 13, 2016, 02:06:59 am
content: The lever metal is all brass with chrome (nickel?) plating so the bare brass is whats showing at the break in the pic.And I have not seen any other equipment or switch with that arrangement, so most likely a custom job for ESI.But yes I would try to drill a pilot hole in the middle of the break and super glue (or loctitie 680 etc) a replacment lever stub in.

author: zlymex
author_rank: Frequent Contributor
timestamp: September 13, 2016, 03:57:50 am
content: Quote from: DiligentMinds.com on September 13, 2016, 02:41:37 amMust be the IET one(HATS-Y series) sold in June 2015.