Articles
Teardown and analysis of Agilent N4430A RF calibration kit
Author: Hendorog
Created: 12 October 2024 Internal design of Agilent N4430A, photo review.

EX - Compact ovenized DC reference module based on ADR1001
Author: Ilya Tsemenko
Created: 29 February 2024 Development module concept for the new ADR1001 ovenized zener reference.

xDevs.com documents repository is online again
Author: Ilya Tsemenko
Created: 10 November 2023 Update about xDevs T&M documentation repository availability and access.

USAC FX repairs Q4'2023
Author: Ilya Tsemenko
Created: 21 October 2023 Minor repair and recalibration of the USA Cal Club FX 10V reference

Calibration Festival / RepairFest 2023
Author: Ilya Tsemenko
Created: 04 August 2023 Highlights report of calibration / equipment repair meetup 2023 in USA.

Mystery Keithley modular voltmeter KM-VM design review
Author: Ilya Tsemenko
Created: 15 June 2023 Teardown and experiments with interesting Keithley KM-VM-02 head-less milli(nano?)voltmeter for system integration application.

Low thermal post conversion for Keithley 2002 DMM
Author: Ilya Tsemenko
Created: 23 April 2023 Keithley 2002 8.5-digit DMM experimental modification with Low Thermal 5-way posts

Very low-cost resistance transfer standard concept build
Author: Ilya Tsemenko
Created: 05 February 2023 Experiment with very low cost resistance transfer for international comparison.

Calibration tests for Round 3 USA Cal Club
Author: Ilya Tsemenko
Created: 17 November 2022 Calibration of the USA Cal Club 10V, 10 kΩ references and long-scale Keithley 2002 DMM

Pimping a Prema 5017 7.5-digit DMM or can we?
Author: Dr.-Ing. André Bülau
Created: 30 May 2022 DMM Modification experiment with new Analog Devices ADR1399KHZ low-noise voltage reference

ESI Standard Capacitor teardown
Author: Ilya Tsemenko
Created: 30 May 2022 Look inside of old ESI SC10 and SC1000 standard capacitors

CalFest 2022 - interlab comparison experiment
Author: Ilya Tsemenko
Created: 23 May 2022 Report on activities during xDevs metrology meeting in 2022.

Power supplies for voltage references, Part 1
Author: Dr.-Ing. André Bülau
Created: 28 March 2022 Practical designs and theory behind high-isolation DC/DC power converters for metrology applications.

Teardown and tests of Hittite 10 MHz - 20 GHz signal source
Author: Ilya Tsemenko
Created: 23 March 2022 Tests, teardown and applications for Hittite HMC-T2220 programmable RF source

LTZ1000CH voltage reference - A simplified version of Wavetek/Fluke 7000
Author: Dr.-Ing. André Bülau
Created: 12 March 2022 Alternative design of solid-state LTZ1000 DC voltage standard, inspired by Wavetek 7000 reference circuit.

DIY 10kΩ reference resistor
Author: Dr.-Ing. André Bülau
Created: 21 February 2022 Precision DIY 10000 Ohm resistance standard build with temperature compensation network.

Mounting D-shaped circular connectors on panels
Author: Ilya Tsemenko
Created: 28 November 2021 Methods and hardware to make D-shaped holes for binding posts and similar connectors.

Peek inside 53-year old wston cell voltage standard
Author: Ilya Tsemenko
Created: 19 September 2021 A quick teardown of Weston-cell based heated voltage standard from Guildline.

ADI ADR1000, new ultra-low noise zener voltage reference
Author: Ilya Tsemenko
Created: 17 September 2021 Today Analog Devices provided way for public and volt-nuts to order brand-new best in class voltage reference - ADR1000

Nanovolt design challenge : Build your own open-source nanovolt-grade DCV meter…
Author: Ilya Tsemenko
Created: 02 September 2021 Join the friendly contest challenge with your open-hardware nanovoltmeter project and a chance to get unique 10.00000 VDC xDevs.com QVR-A reference.

Guildline 6675A/6623 resistance bridge system and experiments
Author: Ilya Tsemenko
Created: 16 August 2021 Review and experiments with ultra-precision direct-current comparator bridge.

LakeShore 370 AC Resistance bridge for cryogenics thermometry
Author: Ilya Tsemenko
Created: 07 May 2021 Cryogenic applications AC resistance/thermometer teardown and review.

HP/Agilent 66** series system DC power supplies
Author: Ilya Tsemenko
Created: 29 March 2021 Overview and benchmarks of 66**A series precision linear DC power supplies from HP and Agilent.

Large DIY environmental chamber for DMM/T&M gear testing
Author: Ilya Tsemenko
Created: 21 February 2021 Low-cost precision thermal/environmental chamber design and build worklog.

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