Articles
Repair of Valhalla 2720GS DC voltage calibrator
Author: Dipl.-Ing. André Bülau
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
Author: Ilya Tsemenko
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
Author: Ilya Tsemenko
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
Author: Ilya Tsemenko
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
Author: Ilya Tsemenko
Created: 02 March 2022 Quick repair and benchmarks of high-power programmable DC load

Repair of Tektronix P6248 1.5GHz Differential probe
Author: Ilya Tsemenko
Created: 31 August 2021 Teardown and repair of mechanically challenged Tek P6248 active differential probe.

Repair of Keithley 2425 100W SMU
Author: Ilya Tsemenko
Created: 30 August 2021 Troubleshooting, repair and calibration of Keithley 2425 SourceMeter Units (SMU)

Repair of Agilent 3458A Option HFL DMM
Author: Ilya Tsemenko
Created: 02 July 2021 Repair of the special Option HFL 8.5-digit Agilent 3458A DMM

Building 3rd Fluke 5700A "Hulk-III" precision calibrator
Author: Ilya Tsemenko
Created: 08 April 2021 Rebuilding Fluke 5700A calibrator from scrap boards with major malfunctions/damages.

HP/Agilent/Keysight 34420A Nanovoltmeter repair
Author: Ilya Tsemenko
Created: 03 August 2020 Repair and experiments with Keysight 34420A 7½-digit nanovoltmeter.

Tektronix ADA400A Differential Preamplifier repairs
Author: Ilya Tsemenko
Created: 28 April 2020 Restoration of four Tektronix Differential ADA400A Preamplifiers

Repair and teardown of Tektronix TMDP0200 and THDP0100 probes
Author: Ilya Tsemenko
Created: 23 April 2020 Repair and experiments with Tektronix TekVPI high-voltage differential probes.

Tektronix TAP1500 probe repair
Author: Ilya Tsemenko
Created: 13 April 2020 Repair of Tektronix 1.5 GHz single-ended active probe

Teardown and repair of Tektronix TDP1000 differential 1 GHz probe
Author: Ilya Tsemenko
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
Author: Ken Eckert
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
Author:
Created: 06 June 2019 Repair of small, but very capable low-voltage thermocouple calibrator source.

Fluke 8842A repair and calibration
Author: Ilya Tsemenko
Created: 09 September 2018 Repair and calibration of reader's Fluke 8842A benchtop DMM

Fluke 1529 Chub-E4 precision thermometer readout
Author: Ilya Tsemenko
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
Author: Ilya Tsemenko
Created: 19 August 2018 Repair attempt of benchtop multimeter, Fluke 8846A.

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