Direct Current Comparator - 1960s forgotten Electromagnetic Metrology Magic

Get the best PCBs for your project at https://pcbway.com/g/Tj5om7
Oscilloscope current probes https://www.welectron.com/Strom
More from me https://www.patreon.com/marcoreps
Unsafe warnings https://www.etsy.com/shop/UnsafeWarnings
Linearity test with unmodified DCC https://github.com/marcoreps/3458a/blob/main/linearity_test_3458B_guildline9930.ipynb
Guildline 9930 docs https://drive.google.com/drive/folders/1yCkxmrz5F6rCXJvoFdVXGDckXsf4VkUX?usp=drive_link

00:00 Intro
02:35 First look
03:57 Small fixes
06:35 Secondary current?
08:48 Guildline docs
10:06 Works!
15:09 INL comparison
16:43 Teardown
18:41 DCC cores
22:55 More teardown
23:46 Constant current source
27:47 More teardown
28:58 Nanovolt amplifier

#metrology #electronicengineering #pcbway