• EEVblog #457 – Oscillator Calibration Followup

    A follow-up on another method to calibration adjust the Agilent 53131A frequency counter against the Stanford Research PRS10 rubidium standard.
    The oscillator drift video is HERE

    Forum Topic HERE

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      • Trev v B

        I suspet your ‘unders’ and ‘overs’ are back-to-front…
        If the internal clock in the DFM is OVER, then it normally causes the frequency displayed on the 7 segment display to be slighly LOW (and vice versa).
        When the internal osc in the DFM is too high, it slightly shortens the counting gate period making the display read a little less.
        When a trace on the scope is moving to the left (relative to the locked comparison trace), that trace has a HIGHER frequency (and thus shorter period)

      • marcin

        Frequency meter, has an input 10 MHz, better connect the output frequency standard, the counter inputs.
        I am at home I have a GPS receiver (Trimble Thunderbolt) display (that shows the status of the receiver) and four 10 MHz output.
        You can get STABILITY about 1×10-11, the more I would not count :)
        Cesium clocks gain of about 1×10-13, 1×10-15’s best
        The most accurate clock is made ​​in Poland pulsar clock :) about 1×10-16 :)
        Cool the frequency standard although a little big :)

      • http://www.himmelstein.com/ Frank Statsman

        I’m not so techy about these things. But when I watch your video you make it sounds so simple. Great explanation, now I have ample knowledge about this.