Repair of Valhalla 2720GS DC voltage calibrator
Created: 21 July 2023
Worklog with repairs and performance testing of unique Valhalla 8-digit DC Voltage calibrator
EG&G 113 amplifier teardown, repairs and benchmarks
Created: 26 March 2023
Testing and repairs of EG&G PARC Model 113 low-noise preamplifier
Teardown and tests of the HP E4436B ESG-DP signal generator
Created: 01 February 2023
Tests on synthesizer RF generator from HP ESG E44xx family.
Project P3459, building high-end DMM by using scrap 3458A parts
Created: 29 December 2022
Building a fully working 3458A out of rejected scrap parts? Experimental DMM project.
Repair of the Chroma 63204 5.2kW DC load
Created: 02 March 2022
Quick repair and benchmarks of high-power programmable DC load
Repair of Tektronix P6248 1.5GHz Differential probe
Created: 31 August 2021
Teardown and repair of mechanically challenged Tek P6248 active differential probe.
Repair of Keithley 2425 100W SMU
Created: 30 August 2021
Troubleshooting, repair and calibration of Keithley 2425 SourceMeter Units (SMU)
Repair of Agilent 3458A Option HFL DMM
Created: 02 July 2021
Repair of the special Option HFL 8.5-digit Agilent 3458A DMM
Building 3rd Fluke 5700A "Hulk-III" precision calibrator
Created: 08 April 2021
Rebuilding Fluke 5700A calibrator from scrap boards with major malfunctions/damages.
HP/Agilent/Keysight 34420A Nanovoltmeter repair
Created: 03 August 2020
Repair and experiments with Keysight 34420A 7½-digit nanovoltmeter.
Tektronix ADA400A Differential Preamplifier repairs
Created: 28 April 2020
Restoration of four Tektronix Differential ADA400A Preamplifiers
Repair and teardown of Tektronix TMDP0200 and THDP0100 probes
Created: 23 April 2020
Repair and experiments with Tektronix TekVPI high-voltage differential probes.
Tektronix TAP1500 probe repair
Created: 13 April 2020
Repair of Tektronix 1.5 GHz single-ended active probe
Teardown and repair of Tektronix TDP1000 differential 1 GHz probe
Created: 12 April 2020
Service of Tektronix TDP1000 1GHz active 4.25/42.5V differential probe
Notes on Keithley DD-51 dual-line VFD replacements
Created: 15 March 2020
Keithley DD-51 dual-line dot-matrix display replacements and display differences between BOE and Noritake-Itron PCBA.
Ectron 1120 Thermocouple/Voltage-Calibrator repair
Created: 06 June 2019
Repair of small, but very capable low-voltage thermocouple calibrator source.
Fluke 8842A repair and calibration
Created: 09 September 2018
Repair and calibration of reader's Fluke 8842A benchtop DMM
Fluke 1529 Chub-E4 precision thermometer readout
Created: 24 August 2018
Repair and testing of Fluke/Hart-Scientific 1529 Chub-E4 precision thermometer system.
Fluke 8846A 6.5-digit DMM teardown and repair attempt
Created: 19 August 2018
Repair attempt of benchtop multimeter, Fluke 8846A.
Advantest R6581T 8.5-digit DVM/Ohmmeter repair
Created: 28 February 2018
Quick and easy repair of another 8½-digit instrument from Japan.
Keithley 6517A electrometer restoration project
Created: 07 February 2018
Repair of the destroyed Keithley 6517A electrometer/voltage source.