https://stream.echo6.co/videos/watch/d2db0e66-7deb-46f4-970c-086cddb4f527 Dave does some performance checks and then tears down a Krohn Hite EDC 4601 0.05% 6 decade 1ppm resolution 0-1000V AC voltage standard. Service Manual with schematics: http://www.eevblog.com/files/4601ServiceManual.pdf MV106 DC Voltage Standard: https://www.youtube.com/watch?v=onqsjDJq4I0 User manual: http://www.krohn-hite.com/htm/ServiceSupport/PDF/Manuals/4601%20Manual.pdf Datasheets: Vactrol: http://www.excelitas.com/downloads/dts_vtl5c3c4.pdf XR2228 Multiplier/Decoder: http://html.alldatasheet.com/html-pdf/119347/EXAR/XR-2228/96/1/XR-2228.html Epson SPG8640 oscillator/divider: http://www5.epsondevice.com/en/quartz/tech/discon/epsondiscon/2000catalog/spg_8640series_e.pdf Forum: http://www.eevblog.com/forum/blog/eevblog-709-edc-4601-ac-voltage-standard-teardown/ EEVblog Main Web Site: http://www.eevblog.com The 2nd EEVblog Channel: http://www.youtube.com/EEVblog2 Support the EEVblog through Patreon! http://www.patreon.com/eevblog EEVblog Amazon Store (Dave gets a cut): http://astore.amazon.com/eevblogstore-20 Donations: http://www.eevblog.com/donations/ Projects: http://www.eevblog.com/projects/ Electronics Info Wiki: http://www.eevblog.com/wiki/ Sun, 17 May 2026 05:25:08 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://stream.echo6.co https://stream.echo6.co/client/assets/images/icons/icon-512x512.png https://stream.echo6.co/videos/watch/d2db0e66-7deb-46f4-970c-086cddb4f527 All rights reserved, unless otherwise specified in the terms specified at https://stream.echo6.co/about and potential licenses granted by each content's rightholder.