Fluke 731B restoration and "improvement" 🤞 (Patreon)

1975 Voltage Standard Restoration & "Improvement"? 😬 Fluke 731B

Joulescope 🇪🇺 https://www.welectron.com/Jetperch-Joulescope-JS220-Precision-DC-Energy-Analyzer Joulescope 🌎 https://www.joulescope.com/ Use marcoreps5 coupon for many brands at Welectron including Joulescope, Beymen & Siglent More from me https://patreon.com/marcoreps EEVBlog Forum thread https://www.eevblog.com/forum/metrology/the-ltflu-(aka-sza263)-reference-zener-diode-circuit/msg905545/#msg905545 Original circuit sim https://tinyurl.com/2mqa6krr Modified circuit sim https://tinyurl.com/2naeonpj More results here soon^TM https://github.com/marcoreps/ADRmu/tree/main/results 00:00 Intro 01:27 Teardown 02:34 Reference PCB 03:49 Circuit analysis 08:27 Improvement? 11:29 Battery stuff 12:51 Joulescope 14:54 Front assembly 17:07 Modded reference 18:51 First results #engineering #restoration #metrology