FS: ADR1399KHZ or LM399AH 10V Calibrated Voltage Reference.  - Page 1
Forum section: electronics / general

author: RoadRunner
author_rank: Frequent Contributor
timestamp: December 08, 2024, 07:32:55 pm
content: While working in my lab I often need to check my multimeter, ADC circuits and other circuits that needed precise voltage. While working a 32-bit ADC board I decided to quickly make this reference board to test performance of 32-bit ADC.ADR1399 Reference board, Its a little board made which take 16-20V input and Give you really precision 10.0000000V output. So that You can calibrate and check your ADC, Multimeter or any other device which can make use of precision 10.000000V. Board has Dual Power with USB as backup for keeping Reference Always On. Reference is Supplied by LT3042 Ultralow noise Regulator.Completely open source you can download all PCB file and other source and make your own. its made with Really Precision and stable LM399AH or ADR1399 along with LT1001ACN8, Along with Top quality 10PPM resistors high quality 20 turn pot has been used for calibration, Top quality Wago connectors for input and output, Reverse polarity protection. It has Dual input supply, USB as Backup supply.Hand made in Germany Calibrated with Keithley DMM7510 7.5 Digit multimeter. With 7.5 Digits meter at 10V resolution is 1uV.There are Two versions available of this board one with LM399AH or with ADR1399 , both are available with and without enclosure. Price differs with different options and enclosure.PCB source, Gerber everything is available on circuitvalley github.You can make your own board with the available source and Bill of materialhttps://www.circuitvalley.com/2024/12/TEN399-ADR1399-LM399-10V-reference-calibrated-DIY-PCB.htmlBoard size 51mm x 82mm x 19mmhttps://github.com/circuitvalley/LM399_Voltage_referenceBoard is available Calibrated or uncalibrated with or Without EnclosureLM399AH Calibrated with Enclosure 105 EURADR1399KHZ Calibrated with enclosure 124 EURShipping is Free within Germany, Shipping within EU/Europe is around 17 EUR , While Shipping to US and Rest of world is going to be around 28 EUR Can Payed with PayPal or Transfer or exchange for goods/Test Equipment or Components.Just Drop a PM if you feel interested.

author: Crambone
author_rank: Frequent Contributor
timestamp: December 09, 2024, 12:45:57 am
content: I’m interested in the ADR1399KHZ Calibrated with enclosure 115 EUR shipped to US.Drew

author: ivo
author_rank: Regular Contributor
timestamp: December 11, 2024, 06:21:49 am
content: You decided not to include the stabilisation network for the AD1399? (1uF, 5.1R)

author: RoadRunner
author_rank: Frequent Contributor
timestamp: December 11, 2024, 07:35:29 am
content: Quote from: ivo on December 11, 2024, 06:21:49 amThank you for your message, There are few suggestion which are coming, Everything that is left will be included in next version.

author: Kean
author_rank: Unknown
timestamp: January 11, 2025, 12:28:14 pm
content: My unit has arrived in Australia, but I won't have time to test it in the lab for a few days. I only have an basic Aneng meter handy at home currently, but it reads 10.00V so that is a good start!BTW, I noticed there is just under 16V on the DC input terminals when powered from USB-C. I presume this is just reverse leakage through D2, and connecting both power supplies (while switching over to battery for transport, or as a battery back up) isn't a problem?My wife picked it up from the post office and unpacked it for me, and although I had shown her a photo of what it should look like she was certain I had been ripped off because it was so small.Mind you she also calls all of my test equipment gear oscilloscopes...

author: Kean
author_rank: Unknown
timestamp: January 11, 2025, 12:48:22 pm
content: Quote from: ivo on December 11, 2024, 06:21:49 amI notice that the suggested compensation network has been added in a new PCB revision V3V1.I guess it shouldn't be difficult to add myself on my V2V1 PCB with ADR1399, but probably best done near the output connector to avoid soldering near the ref or opamp?

author: RoadRunner
author_rank: Frequent Contributor
timestamp: January 11, 2025, 02:07:27 pm
content: Quote from: Kean on January 11, 2025, 12:48:22 pmYes I have decided to make new Version with Snubber Resistor and Capacitor.Yes I also would suggest not do any soldering near Reference or Even Opamp. Best Place as you Suggested would be Near to output Connector. But Be aware of the Clearance to the Enclosure on the Back Side.Regards

author: benj38
author_rank: Frequent Contributor
timestamp: February 21, 2025, 09:10:03 pm
content: @RoadRunner, how long do you burn-in/age these before calibrating?

author: RoadRunner
author_rank: Frequent Contributor
timestamp: February 22, 2025, 09:19:08 am
content: Quote from: benj38 on February 21, 2025, 09:10:03 pmThe are burned for a minimum 4 Weeks before reading valuesI have a test jig for burring few of them together

author: Furna
author_rank: Frequent Contributor
timestamp: July 12, 2025, 09:50:31 am
content: Hello@RoadRunnerI received a week ago my TEN399 ADR1399 that is also my first Voltage reference based on that shunt.I am really very impressed about temperature coefficient.It woul be nice if also the temperature at which the device was calibreted is reported on the label (I guess you are using your Keithley DMM7510).Thank you.

author: RoadRunner
author_rank: Frequent Contributor
timestamp: July 16, 2025, 08:52:40 pm
content: Hello@FurnaThank you for feedback Will note and mention temperature on device , Temperature in my Lab is normally hangs around 22 to 25 C . Your device was also calibrated around this temperature.Regards