EEVblog #709 - EDC 4601 AC Voltage Standard Teardown

Dave does some performance checks and then tears down a Krohn Hite EDC 4601 % 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: EEVblog Main Web Site: The 2nd EEVblog Channel: Support the EEVblog through Patreon! EEVblog Amazon Store (Dave gets a cut): Donations: Projects: Electronics Info Wiki: Теги: voltage standard,ac voltage standard,voltage reference,calibration,calibration standard,dc,ac,teardown,zener diode