Of course you would need to calibrate a JJ standard. If you recall, the JJ works by being cooled to some LN2 like temperature, and then being fed with a microwave frequency that is part of the standard's definition. If the temperature is wrong, or the frequency is wrong, or ..., the voltage will be wrong. The whole point behind the JJ is that it connects the standard voltage to the standard frequency/time ... the most accurately specified of the known standards.
Cs standards, even though they are primary standards, are also in need of calibration because the frequency they create is dependent on the magnetic field surrounding the tube, and the construction of the tube. All Josephson Junction V standards produce a slightly different voltage, and all Cs standards produce a slightly different frequency. -Chuck Harris Joe Hobart wrote:
Bill, Would a Josephson Junction standard need to be calibrated? Adjusted and maybe compared, yes, but you should not need to calibrate a primary standard? Years ago we had HP Cesium Frequency Standards at work. There were primary standards and good to 4E-12 with no additional calibration. Joe
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