10 digit voltmeter! - Page 1
Forum section: electronics / testgear

author: usagi
author_rank: Frequent Contributor
timestamp: May 06, 2017, 08:25:58 pm
content: http://www.supracon.com/en/ac_quantum_voltmeter.htmlLet's see dave do a teardown

author: rob77
author_rank: Super Contributor
timestamp: May 06, 2017, 08:44:25 pm
content: such a setup is so expensive that only national metrology labs have one (not even all countries have one).

author: FrankBuss
author_rank: Unknown
timestamp: May 06, 2017, 08:52:46 pm
content: The price is missing on the website.

author: testian
author_rank: Regular Contributor
timestamp: May 06, 2017, 09:05:38 pm
content: If you have to ask how much it costs, you can't afford it

author: DaJMasta
author_rank: Super Contributor
timestamp: May 06, 2017, 10:19:18 pm
content: Quote from: testian on May 06, 2017, 09:05:38 pmI know liquid helium can be pricey, but they've got an affordable cryo-cooler variant where you don't even need it! Just throw in a little hardware and give it a few thousand watts and you'll be fine! My only complaint is the limited input range, I'll bet it doesn't even have input protection (because it would screw up the reading far too much)Neat tech, though. I'm sure even cal lab techs would need a whole battery of specialized training to be able to measure things properly using this stuff... I wonder what the effective number of counts would be on such a meter - are we just mid hundred millions or over a billion?

author: Housedad
author_rank: Frequent Contributor
timestamp: May 06, 2017, 10:21:24 pm
content: Dang! I couldn't even afford the cryogenic gasses to keep it operating for one day. Can you spell MONEY PIT?

author: rob77
author_rank: Super Contributor
timestamp: May 06, 2017, 10:24:47 pm
content: don't know the exact figure, but considering the fact it has a josephson junction array cooled with liquid helium and it requires an incredibly accurate frequency as input to create the incredibly accurate voltage.... it simply won't be cheapcost of a 3458A would be considered peanuts compared to the cost of a josephson voltage standard.

author: Housedad
author_rank: Frequent Contributor
timestamp: May 06, 2017, 11:10:19 pm
content: read more on this it the wiki. fascinating!https://en.wikipedia.org/wiki/Josephson_voltage_standard

author: usagi
author_rank: Frequent Contributor
timestamp: May 07, 2017, 12:20:22 am
content: Quote from: testian on May 06, 2017, 09:05:38 pmbut dave can find $300k test equipment in his dumpster!surely he can find one of these!

author: DaJMasta
author_rank: Super Contributor
timestamp: May 07, 2017, 01:04:35 am
content: But six digit dumpster finds may still be a figure or two off of the price of this thing....I wonder If you'd even send anything that expensive to a dumpster, under any circumstance.

author: coromonadalix
author_rank: Super Contributor
timestamp: May 07, 2017, 01:49:48 am
content: @dajmasta you could be surprised what i've seen in a dumpster loll

author: Vgkid
author_rank: Super Contributor
timestamp: May 07, 2017, 02:50:40 am
content: https://www.nist.gov/news-events/news/2013/04/primary-voltage-standard-whole-worldCount the digits.I wonder how many you can get with a binary divider and a null voltmeter.

author: Housedad
author_rank: Frequent Contributor
timestamp: May 07, 2017, 06:25:41 am
content: Those guys in those photos are the ultimate volt nuts! BAR NONE!

author: coromonadalix
author_rank: Super Contributor
timestamp: May 07, 2017, 12:17:19 pm
content: 1 part by billion? i want one loll holly cow ...