Precision resistors CCCP - Page 1
Forum section: electronics / general

author: Jester
author_rank: Frequent Contributor
timestamp: May 04, 2022, 01:28:35 pm
content: I picked up this set of Soviet resistors locally on Kijiji yesterday.I'm not sure what to make of the notes on the image on the far right?Wild idea of what these are worth?

author: SeanB
author_rank: Super Contributor
timestamp: May 04, 2022, 01:48:01 pm
content: Notes are saying verified July 1992, due for inspection July 1993, with the lab code and checker's number on top, and his signature at the bottom, plus the official calibration lab stamp on the very yellowed paper label.

author: bobAk
author_rank: Contributor
timestamp: May 04, 2022, 01:48:42 pm
content: Last resistor - reference (standard) resistor. The remaining inscriptions when it was verified and when the next time to verify.

author: HighVoltage
author_rank: Super Contributor
timestamp: May 04, 2022, 01:57:06 pm
content: Quote from: Jester on May 04, 2022, 01:28:35 pmWhat instrument did they use in the early 90th to get 10 digit resolution for a 1k resistor?

author: bobAk
author_rank: Contributor
timestamp: May 04, 2022, 02:05:23 pm
content: Resistance comparator.

author: bsdphk
author_rank: Regular Contributor
timestamp: May 04, 2022, 02:20:06 pm
content: My math says 7.7 PPM/K tempco, that's kind of a lot, isn't it ?

author: free_electron
author_rank: Super Contributor
timestamp: May 04, 2022, 03:44:31 pm
content: These are not resistors. They are indian chants... unit of Oms ...

author: Jester
author_rank: Frequent Contributor
timestamp: May 04, 2022, 04:06:39 pm
content: Quote from: HighVoltage on May 04, 2022, 01:57:06 pmI’m not sure but I also picked up a nice Agilent 34401A at the same time and the seller stated that the calibration of the meter was verified with a top of the line Advantest and that the meter was only out a few PPM, so well within spec. The yellow label looks like it was done recently.

author: Jester
author_rank: Frequent Contributor
timestamp: May 04, 2022, 04:10:08 pm
content: Quote from: bsdphk on May 04, 2022, 02:20:06 pmSeller stated that they use to (1990’s) submerge them in an oil bath to guarantee temperature swings were very slow.These ones look better at 1-2 PPM per degree , but not cheap at $800 a pop.https://www.instrumart.com/products/42862/wika-cer6000-reference-resistors

author: guenthert
author_rank: Frequent Contributor
timestamp: May 04, 2022, 05:33:00 pm
content: Quote from: HighVoltage on May 04, 2022, 01:57:06 pmI'd guess a bridge with a long scale (6 or more digits) DMM as null indicator and someone mindlessly copied all the digits there were. Good luck setting the temperature of the oil bath with an uncertainty better than uK

author: bobAk
author_rank: Contributor
timestamp: May 04, 2022, 05:56:10 pm
content: Not necessarily an oil thermostat, you can also use an air one. These resistors are supposed to be used at 20 degrees Celsius. Their task is not low TC, but long-term stability.Add. Not a bridge, but a comparator. Although there were also long scale bridges.

author: manganin
author_rank: Regular Contributor
timestamp: May 07, 2022, 06:27:38 am
content: The same question answered a year ago:Quote from: manganin on July 09, 2021, 09:51:57 am