WTB: Geller Labs 10V Voltage Reference [found and bought] - Page 1
Forum section: electronics / general

author: HighVoltage
author_rank: Super Contributor
timestamp: July 18, 2014, 10:46:31 am
content: I am looking for a Geller Labs 10V Voltage Reference SVR or SVR-TGeller Labs is not making this anymore and may be someone has one that is not needed.I am interested in buying one.http://www.gellerlabs.com/Voltage%20References.htmAnyone, please let me know, if you consider selling yoursThanksEdit:Found one and bought one, thanks to this great place

author: BillWojo
author_rank: Regular Contributor
timestamp: July 18, 2014, 11:10:38 pm
content: I looked at there site and it's unclear if they still sell the kits. Looks like with the basic kit it gives you a darn close 10VDC reference voltage. Not bad for about 25 bucks.BillWojo

author: BillWojo
author_rank: Regular Contributor
timestamp: July 18, 2014, 11:42:00 pm
content: I just got a reply back from Joe Geller, as long as his stock of parts last he is still selling kits. Just bought one, $30.18 with shipping.BillWojo

author: kmel
author_rank: Contributor
timestamp: July 19, 2014, 01:50:32 am
content: Quote from: HighVoltage on July 18, 2014, 10:46:31 amJoe Geller is selling the kit unit main stock runs out.The complete SVR kit is $24.95 plus shipping to DE is $11.48 by USPS First Class International mail.Got mine a month ago.

author: HighVoltage
author_rank: Super Contributor
timestamp: July 19, 2014, 08:27:54 am
content: Thank you all for your replies.I had sent a mail to Joe by the end of 2013 and then got a reply that he is not selling any more.So, I assumed that he is not selling at all.Right now I sent another email to him.May be I will get a positive reply this time.

author: eurofox
author_rank: Unknown
timestamp: July 19, 2014, 12:52:42 pm
content: Quote from: HighVoltage on July 19, 2014, 08:27:54 amI think you waste your time since he close he's business.I got oneit is build in a nice metal box with a power supply, you can make me an offerPS: it is not the low cost version.

author: HighVoltage
author_rank: Super Contributor
timestamp: July 19, 2014, 02:19:20 pm
content: With thanks to Eurofox, I now bought one of the SVR-T models.

author: BillWojo
author_rank: Regular Contributor
timestamp: July 19, 2014, 02:22:58 pm
content: You can still get the kit but he does not calibrate them any longer. The basic kit without using the trimpot is as accurate as the AD587 chip. Those chips are calibrated when manufactured and more than good enough to check out the lower DC voltage range of your DMM. I can't think of any reason that I would need the super accuracy of a calibrated voltage reference device for the work that I do. Joe has a well written discription of what this does on his site.BillWojo

author: eurofox
author_rank: Unknown
timestamp: July 19, 2014, 03:03:26 pm
content: Quote from: BillWojo on July 19, 2014, 02:22:58 pmYou need a calibrated one to calibrate a 8,5 digit instrument

author: Alexei.Polkhanov
author_rank: Frequent Contributor
timestamp: July 19, 2014, 08:38:03 pm
content: This is 2.5V device I got 2 years ago. I did not do anything to it - still pretty accurate. Actually it was 2.50002 when I got it, ambient temperature maybe different. Surprising how stable these things are.

author: BillWojo
author_rank: Regular Contributor
timestamp: July 20, 2014, 02:26:34 am
content: Alexei, that's amazing. Where did you get it?BillWojo

author: Alexei.Polkhanov
author_rank: Frequent Contributor
timestamp: July 20, 2014, 05:30:00 am
content: I ordered it fromhttp://www.gellerlabs.com/.I understand that Doug does not sell them anymore

author: kmel
author_rank: Contributor
timestamp: July 20, 2014, 05:55:28 am
content: Quote from: Alexei.Polkhanov on July 20, 2014, 05:30:00 amAnnual calibration of voltage standards or 8-1/2 digit multimeters isn't cheap.To produce a transfer reference like the SVR-T is labor-intensive and time is money.

author: HighVoltage
author_rank: Super Contributor
timestamp: July 20, 2014, 08:06:24 am
content: I just got an email reply from Joe Geller, that he is still selling the SVR as kits for $24.95 plus $6.51 for shipping.But he is not selling the SVR-T anymore, because he has no more parts and it is too time intensive.I reached him at: Joe Geller <joegeller@gellerlabs.com>

author: HighVoltage
author_rank: Super Contributor
timestamp: July 20, 2014, 08:11:19 am
content: Quote from: Alexei.Polkhanov on July 20, 2014, 05:30:00 amYour picture of the PCB and the "certificate" look more like an item from "Voltage Standard" and not "Geller Labs"http://www.voltagestandard.com/Right?

author: Alexei.Polkhanov
author_rank: Frequent Contributor
timestamp: July 20, 2014, 06:21:09 pm
content: Yes right, for some reason I assumed it was same person behind both. They look very similar.

author: jpb
author_rank: Super Contributor
timestamp: July 20, 2014, 09:52:51 pm
content: Quote from: HighVoltage on July 20, 2014, 08:06:24 amI also e-mailed him and he responded very quickly. There is also an option to buy the bare boards which is the route I am taking as I want to use the CERDIP version of the chip and perhaps play around with some variation on the parts. Of course an alternative means of accurate calibration is needed.