ASR-103 - Page 1
Forum section: electronics / general

author: maxamp
author_rank: Contributor
timestamp: December 06, 2024, 05:53:35 am
content: Has anyone used or done a tear down of a ASR-1**? I can't find anything about it in EEVblog...Mouser store link to ASR-103 $6,204.55:https://www.mouser.com/ProductDetail/Alpha-Electronics/ASR-103?qs=hWgE7mdIu5R25LS1yp8SdQ%3D%3D&srsltid=AfmBOoolc1-lgZ9fvI4DQWtX7C0wGJsJcDNH76tcIUk59h36N9-eJ48-±3 ppm per yearPaper about the evaluation of a ASR-103:https://static1.squarespace.com/static/5525d010e4b00afb743a318d/t/55bbd5a8e4b002b451be6a92/1438373288134/ASR-103-report-NMi.pdfSeems like you would be better off putting a Y607110K0000T9L in a box or spending the money on a SR104.Digi key Y607110K0000T9L $80.71:https://www.digikey.com/en/products/detail/vpg-foil-resistors/Y607110K0000T9L/6029609Shelf life stability: 2 ppm for at least 6 years(unaffected by humidity)SR104 $7,728.00https://www.ietlabs.com/10-000-ohm-primary-resistance-standard.htmlHighest accuracy (1 ppm/yr) and stability (±0.5 ppm/yr typical) of any resistance standardYou can get the 1K version for the low low price of $3,699.00 on ebay:eBay auction: #204820149899

author: Overspeed
author_rank: Frequent Contributor
timestamp: December 06, 2024, 06:58:54 am
content: Quote from: maxamp on December 06, 2024, 05:53:35 amHelloThat not rocket science , there is some pictures of similiar products ( other brand on this forum ) generally that a main resistor and one in series / parallel to adjust the value , I have put in the post a link with Xdev DIY resistor that very close to the design except Xdev use a random value and not an adjusted value.Depend who you are as If you are a big company with budget that not a problem but perhaps that possible to be clever ( estimated prices include shipping )a nice machined CNC alu enclosure can be in the 700 USD ( CAD / CNC machining / surface treatment ..)a set of Pomona banana connectors = 5x30 = 150 USDinternal insulation bespoke cut = 100 USDinternal shield = 100 USDtemp sensor well = 50 USDvarious parts 25 USDafter the main component as the '' resistor '' is in the 150 x 4 = 600 USD max and can be tested / calibrated before installation and after installationfinal calibration to complete the project a quite costly service following the 2019 NIST prices listXdev have interesting things on his website :https://xdevs.com/article/bsw104/a DIY transfert low cost from Xdevhttps://xdevs.com/article/lcrbox/BE AWARE of EBAY standard as there is no proof of evidence as the resistor have not been over heated by using wrong current levelRegardsOS

author: Overspeed
author_rank: Frequent Contributor
timestamp: December 06, 2024, 07:52:46 pm
content: HelloI link a test report of the ASR-103RegardsOS

author: Overspeed
author_rank: Frequent Contributor
timestamp: December 07, 2024, 08:45:30 am
content: Helloa Fluke 742 autopsie on Xdev websitehttps://xdevs.com/article/f742a/Xdev work quality is impressiveFluke 742 by using two parallel copper plates ( slotted / drilled ) is a very good design which allow a simple setup and easy DIY without sophisticated tools .RegardsOS

author: MiDi
author_rank: Frequent Contributor
timestamp: December 07, 2024, 01:24:42 pm
content: There are some papers aboutHRU standard resistorsavailable.Those have different design than PWW (old SR104, F742A) or BMF (VHP100/200/VHA series, new SR104?).Seems ASR does not use same technology as HRU/USR-SF, more like classic BMF:Alpha Electronics Standard ResistorsBe careful with DS of VPG resistors, their typical values may be far from what you get IRL:Study of temperature coefficient on 260 precision resistors.Papers (may be available on a popular open source science hub):Characterization of 1 kΩ Metal-Foil Standard Resistors and Continuing Drift-Rate Evaluation of 1 Ω and 10 Ω Standard ResistorsNovel 100-Ω Metal Foil ResistorCharacterization of 100-Ω Metal Foil Standard Resistors

author: Overspeed
author_rank: Frequent Contributor
timestamp: December 07, 2024, 02:09:29 pm
content: HelloThis one is interesting with internal picsRegardsOS

author: maxamp
author_rank: Contributor
timestamp: December 24, 2024, 11:41:19 pm
content: QuoteI put the VPG Y607110K0000T9L resistor I got from Digi-key on top of a peltier hot/cool plate and a 3458A. Temperature cycled from 19-27C and got about 0.31ppm/C which is off but close to the 0.2ppm/C spec. It could be due to my setup rather than the resistor. The xdevs article you linked is more about temperature coefficient rather than long term drift.

author: Andreas
author_rank: Super Contributor
timestamp: December 25, 2024, 08:29:54 am
content: Hello,What is the X-Axis: time in seconds or number of measurement (@ which NPLC).For me it looks like there is some lagging effect (resistance reacts delayed to the temperature setpoint)and/or some ageing drift (start and stop at the same temperature differ somewhat).So I would:- stay at the temperature extremes for a longer time. (plateau)- cycle several times to see eventually occuring ageing drift.By the way:after my experience most of the heat transfer inside the resistor is done by the resistor wires.So the wires should have a good thermal coupling to the temperature block.Do you have the possibility to also measure the actual temperature value?with best regardsAndreas

author: bck
author_rank: Contributor
timestamp: December 25, 2024, 09:15:12 am
content: just a guess from my side: the "lag" is him running ACAL after an SP change.~12min for a full ACAL iirc => about 45min each step

author: Andreas
author_rank: Super Contributor
timestamp: December 25, 2024, 10:57:41 am
content: Hello,that is not what I am seeing:from lowest temperature between 20 and 22 deg C there is no change in resistance.Then at 23 deg C a small movement and at 24 deg C a large jump.So the delay is more than one ACAL cycle.with best regardsAndreas

author: Kleinstein
author_rank: Super Contributor
timestamp: December 25, 2024, 12:31:24 pm
content: Unless the measurement cycle is really long, it may not be a good idea to add ACAL calls in between. They also add some noise and over a short time the meter is more stable than the ACAL performance. It is still more the choice of no ACAL at all, or ACAL relatively frequent, like 2 x per step.

author: maxamp
author_rank: Contributor
timestamp: December 26, 2024, 09:42:38 am
content: X-axis is time in seconds. I'm taking an ACAL with the temperature change which flat lines the readings. I put the temperature sensor on the plate, put the resistor leads over the plate (rather than to the side), switched to 8508 to avoid ACALS and 1 hour per step. I'll post results when it's ready. Thanks for the feedback.

author: aronake
author_rank: Frequent Contributor
timestamp: December 26, 2024, 10:47:50 am
content: Quote from: maxamp on December 26, 2024, 09:42:38 amCould you show a picture of you "plate setup"? If it is what it sounds like, a peltier with heatsink on one side and you just put the resistor on top of that in open air, i could see this being a big source of unreliable measurements. Better to build a box that the peltier are cooling. There are lots of such build projects posted here.

author: maxamp
author_rank: Contributor
timestamp: December 26, 2024, 05:53:32 pm
content: I attached what I have measured so far. Keep in mind I started everything cold. It now looks more like 0.83ppm/C.I got this really cheap off ebay. Its built like a tank. I'm sending it serial commands. It only has a set resolution of 1C.https://torreypinesscientific.com/product/digital-shaking-chilling-heating-dry-baths/

author: maxamp
author_rank: Contributor
timestamp: December 26, 2024, 06:21:04 pm
content: Yes, I realize something like this would be more optional. I just haven't put the time into building it yet.https://www.eevblog.com/forum/metrology/diy-large-thermal-chamber-for-metrology-tm-testing/msg3474756/?topicseen#msg3474756

author: Andreas
author_rank: Super Contributor
timestamp: December 26, 2024, 07:40:51 pm
content: Looks better now.the best results on my measurements I got with a setup like here:https://www.eevblog.com/forum/metrology/t-c-measurements-on-precision-resistors/msg695463/#msg695463(note the 2 temperature sensors in good contact to the heat spreader near the resistor wires).with best regardsAndreas

author: maxamp
author_rank: Contributor
timestamp: December 28, 2024, 07:25:11 am
content: Here is the longer run data. Linear fit is 1.04PPM/C.