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xDevs.com in-house projects and hardware
- KX Ultra-stable Voltage reference – public first generation of LTZ1000A 7V DC voltage standard
- Project 792X – 10V “FX” reference and Fluke 792A support pack – second generation of LTZ1000A-based ultra-stable DC Voltage standard
- Calibration procedure and results for xDevs/Fluke 792× 10V DC Reference – calibration procedure for FX-based standard
- LX DC Voltage reference with switching power supply block – third generation ADR1000-based zener reference
- QVR – Ultra-low noise DC Voltage reference – special quad-LTZ1000A reference module
- Neutron Power supply ATE – Power supply automated test system, 12-channel 2kW DC power rating for electronic load, 2% accuracy
- Development boards – ATMEL AVR, ARM, Altera CPLD and FPGA development opensource hardware kits
- Low-cost resistance transfer standard concept build
Calibration Festival meetups and interlab comparisons
- CalFest 2025 progress report
- CalFest 2024 progress report
- CalFest 2023 progress report
- CalFest 2022 progress report
- Calibration tests for Round 3 USA Cal Club
- SI units 2019 redefinition and TW NMI tour – Calibration transfers with Taiwan’s ITRI CMS National Metrology Lab
Resistance metrology
- Tinsley 5685A resistance standards review
- Fluke 742A resistance standards repairs and performance checks
- Study of temperature stability, more than 260 resistors – Methodology and test results of various commercial precision resistors
- Fluke SL935 heated resistance standard prototype
- ESI SR104 10000 Ohm resistance standard review
- DIY 10kΩ reference resistor
- Guildline 6675A/6623 resistance bridge system and experiments
- Benchmarks of old L&N 4040B 10000 Ohm resistance standard
- High-current low resistance and shunt measurements log
- Resistor ratio dividers based on N equal resistors
- Repair and review of Guildline 9330 standard resistor
- Review and benchmarks of Julie Research Labs 1 Ω CH48T4HK resistor elements
DC Voltage metrology
- LTZ1000CH voltage reference – A simplified version of Wavetek/Fluke 7000
- Tale 2 : eBay LTZ1000A reference modules and caveats
- Wavetek 7000 cell reference testing
- Tale 1 : Little jumper, or sharks in voltage references world
- Keithley 262 low thermal divider overhaul
- Datron 4910 series DC voltage reference repair 4910 series DC voltage reference repair
- Keithley 7168 nanovolt switch card and it’s use with RPI
- DataProof 160A low thermal EMF scanner teardown
- Review and application of EM A10 nanovolt amplifier
AC\DC Voltage metrology
- Fluke 792A AC/DC transfer standard repair – Repair of battery block and testing of Fluke 792A metrology AC/DC transfer standard.
- Wavetek 4920M AC standard repair – Repair and calibration of Wavetek 4920M AVMS.
- Fluke 5790A AC Measurement Standard repair
- Review and experiments with Ballantine 1394N TVC kit
Low currents/high resistance metrology
- Keithley 6430/4200 preamplifier teardown and stand-alone use options
- Keithley 6517A electrometer restoration project
- HP 16340A RC calibration box for electrometers
RF equipment
- Agilent E8251A PSG-A 20 GHz analog signal generator repair
- Agilent N5161A MXG ATE RF Analog Signal Generator repair and benchmarks
- Leo Bodnar’s fast pulser (2.92mm version) review
Thermometry and environmental instrumentation
- Keithley 2510 repair – Repair and calibration of Keithley Model 2510 TEC SMU
- Large DIY environmental chamber for DMM/T&M gear testing
- Arroyo TECpak temperature controller unit review and usage
- Building air-bath thermal Peltier chamber
- Using BME280 temperature/humidity/pressure sensor with Raspberry Pi
- Fluke 1529 Chub-E4 precision thermometer readout
Calibrators, repairs and applications
- Fluke 5700A calibrator overhaul – Service and minor repairs for high-end 7½-digit Fluke 5700A series calibrator.
- Fluke 5700A/NAF units repair and troubleshooting – Service of 5700A/NAF units
- Wavetek/Datron 4808 multifunction calibrator restoration log – Service for 7½-digit Wavetek 4808 calibrator.
- Time Electronics 9823 AC-DC calibrator repair – Service for 5½-digit Time Electronics calibrator.
8½-digit DMMs, repairs and reviews
- Agilent 3458A HFL repair
- Keysight 3458A RoHS Black Edition DMM review and evaluation
- HP/Agilent/Keysight 3458A repair worklogs – Detailed worklog covering HP 3458A 8½-digit DMMs repair and upgrades
- HP/Agilent/Keysight 3458A 8.5-digit DMM modifications and tweaks
- HP 3458A second unit service and rebuild – Worklog covering second HP 3458A 8½-digit DMM
- HP 3458A repair for a friend – Third article with HP3458A repairs.
- HP 3458A repair and FRAM upgrade by TEKTRON – FRAM upgrade and other experiments from TEKTRON
- Project P3459, building high-end DMM by using scrap 3458A parts – Work in progress on experiments with HP3458A hardware.
- Datron 1281 DMM repair and calibration worklog – worklog covering two Datron/Wavetek 1281 8½-digit DMMs repair and upgrades
- Keithley 2002 repair – Extensive repair experience for Keithley Model 2002 8½-digit precision multimeter
- Keithley 2002 review – Teardown and review of Keithley Model 2002 8½-digit precision multimeter
Cryogenics and instrumentation
ADC \ DAC and acquisition hardware
- Texas Instruments ADS1262 32-bit ADC evaluation, intro
- Evaluation of Linear DC2390A – Linear LTC2500-32 32-bit SAR ADC solution
Software and automation
- HP 3458A GPIB remote control guide
- Using Agilent/Keysight E5810A with python
- Setting up and using Agilent 82357B GPIB USB pod in RPi Linux
- Setting up and using NI USB-GPIB-HS in Raspberry Pi Linux
- xDevs.com CalKit automation software manual
- Using ALTERA/Terasic DE1-SoC (Cyclone V SE FPGA SoC) kit for linux-gpib
Test equipment repairs and reviews
- Replacement of the lamp backlit LCD for new high-contrast type in MIL 6010B
- INL (Integral non-linearity) performance testing
- DMM noise measurement – public project to measure and compare noise of bench multimeters.
- Keysight B2987A electrometer teardown – Brief look on high-performance electrometer design
- Keithley 2001 repair – Repair experiences with multiple Keithley Model 2001 7½-digit precision multimeters
- Keithley 2400 repair – Repair of broken VFD glass and testing Keithley Model 2400 SourceMeter
- Notes on Keithley DD-51 dual-line VFD replacements
- Repair of Keithley 2425 100W SMU
- Keithley secret menu and settings
- HP/Agilent/Keysight 34420A Nanovoltmeter repair
- HP 3245A Universal source repair – Repair and calibration of rare HP 3245 precision 6½-digit DC/AC signal source
- HP 3456A digital voltmeter restoration
- Tweaks and mods for HP 3457A 6.5-digit DMM
- Evaluation of modern pressure sensors with digital interface
- How to recover white color of old plastic panels and buttons
- Fluke 8842A repair and calibration
- HP 34401A repair and calibration worklog
- Agilent 4142B semiconductor SMU system repair and usage
Oscilloscopes and digital logic
- Review and tests of Femto HVA low-noise amplifier
- Leo Bodnar’s fast pulser (2.92mm version) review
- Tektronix ADA400A Differential Preamplifier repairs
- Repair and teardown of Tektronix TMDP0200 and THDP0100 probes
- Repair and PC HW ugrades for TDS5000B series scope
- Tektronix TDS7000 series repair
- Teardown and repair of Tektronix TDP1000 differential 1 GHz probe
- SensePeek SP200 passive probe review
- Benchmarks and performance of Teledyne LeCroy ZS1500 active single-ended probe
- Picotech TA061 SMA passive probe review
- Teledyne LeCroy PP023 passive probe review
CPU & GPU Overclocking and guides
- Overclocking for Raspberry Pi 3 Model B with liquid nitrogen
- Extreme OC toolkit for EVGA GeForce GTX 3090 K|NGP|N
- EVGA RTX 2080 Ti KINGPIN Edition Technical Guide
- EVGA GTX 1080 Ti K|NGP|N Edition graphics card
- Reference GTX 1080 Ti – Uncorking bigger Pascal
- Reference GTX 1080/1070 – Uncorking Pascal
- Teardown of the EVGA GeForce RTX 2080 Ti XC Ultra
- EVGA GTX 980 Ti K|NGP|N OC Guide
- Extreme OC modifications for NVIDIA GeForce GTX 980
- Using Raspberry Pi to control EPOWER VRM
- Review of NVIDIA Titan V design and power benchmarks
- Design guide for EVGA Z390 DARK motherboard
- Overclocking guide for EVGA X299 DARK motherboard
- Review and usage of EVGA EPOWER V power module