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Cesium-Beam Servo System Using Square-Wave Frequency Modulation

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1 Author(s)
Daams, H. ; National Research Council of Canada, Ottawa, Ont., Canada.

This paper describes a new modulation and servo system that is being tested in the NRC long-beam cesium-frequency standard. Square-wave frequency modulation is employed; it is introduced by switching between two separately generated frequencies. The synthesizer producing these frequencies and the problems caused by switching transients are described. Since in a laboratory standard systematic errors play a very important role these errors are discussed in the description of the servo system. The resulting systematic error as calculated from results of experiments on its components is less than 1 part in 1013.

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Instrumentation and Measurement, IEEE Transactions on  (Volume:IM-20 ,  Issue: 1 )