xDevs.com

xDevs.com is dedicated to sharing electronics engineering, digital and analog circuit design, metrology, cryogenics, physics and calibration, PCB layout, FPGA and firmware development for embedded systems and devices.

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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

Resistance metrology

Inter-lab comparisons

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
xDevs.com CalFest 2021 report
xDevs.com CalFest 2022 report

DC Voltage metrology

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

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

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

STI SuperLink RX cryocooled RF filter review

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

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