EEVblog #709 – EDC 4601 AC Voltage Standard Teardown

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

MV106 DC Voltage Standard

User manual

Datasheets:
Vactrol
XR2228 Multiplier/Decoder
Epson SPG8640 oscillator/divider

Forum HERE

Hires teardown photos:

Podcast: Download