• 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

    XR2228 Multiplier/Decoder
    Epson SPG8640 oscillator/divider

    Forum HERE

    Hires teardown photos:

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