EEVblog #457 – Oscillator Calibration FollowupPosted on April 20th, 2013 3 comments
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
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)
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
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.
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