Flex or FR4, get your advanced PCBs from https://www.pcbway.com/setinvite.aspx?inviteid=65003 5% off Brymen & Siglent w/ coupon 'marcoreps5' https://www.welectron.com/ Miniware LCR tweezers https://www.banggood.com/custlink/vDvho1IbtN Thermal imager https://www.banggood.com/custlink/KvmyouSNJT Stereo microscope https://www.banggood.com/custlink/KmGRl79QFJ Exclusive videos sometimes on https://www.patreon.com/marcoreps IanScottJohnston transformer anatomy https://www.youtube.com/watch?v=BgYZnbLIwc8 Massively simplified 732A Falstad sim https://tinyurl.com/yzcvd2pn LTZ1000A Falstad sim https://tinyurl.com/yj8tvqjo Has cool stuff other than feedthroughs https://twitter.com/GigaBecquerel Alternative hermetic feedthrough pins: Tusonix / CTS 4300 Mu metal cans https://de.rs-online.com/web/p/audio-transformatoren/6675962/ 0.2 ppm/°C VSMP resistors https://de.rs-online.com/web/c/passive-bauelemente/festwiderstande/smd-widerstande/?applied-dimensions=4294097052 R-Core transformer https://s.click.aliexpress.com/e/_Aq6SMY Wavetek 7000 EEVblog forum https://www.eevblog.com/forum/metrology/(3300)-wavetek-7000-the-hidden-gemstone/ Schroff RatiopacPRO AIR https://schroff.nvent.com/en-de/products/enc24571-911 LTZ1000 tests with various 'above' resistors https://snapshot.raintank.io/dashboard/snapshot/y6f9BqnEAGTXXd3IyctaI4C8PiKgosUk A few days in the life of 732A https://snapshot.raintank.io/dashboard/snapshot/FdXwDqNPFZMvbtzDFIvHqIOubY1S2T4c Fluke 5700A cal check logs https://github.com/marcoreps/5700A/tree/master/logs LTZmu stats w/ imbalanced batteries https://snapshot.raintank.io/dashboard/snapshot/DNbQoTWw6M4Rm1AbSv6CCZc9SKTMOZPW LTZmu project WIP https://github.com/marcoreps/LTZmu 00:00 Intro 02:01 Fluke 732A 02:55 732A battery 04:35 732A guarding 06:00 732A pre-regulator 07:32 732A ref assembly 09:11 732A thermals 10:42 732A 'fixes' 12:06 732A heater circuit 12:42 732A ref circuit 14:31 LTZmu 10V standard 15:33 LTZmu-metal cans 16:08 LTZmu SMD resistors 17:00 LTZmu flex PCBs 18:49 LTZmu assembly 20:23 LTZmu concepts 23:20 LTZmu surroundings 26:46 LTZmu circuit 27:48 Wavetek 7000 32:16 732A results 34:07 LTZmu no results yet