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Title: On An Improved Way Of Resolving Two Very Stable And Accurate Frequency Signals And The Benefits Conferred As A Result
Author: Richard Percival
Source: 2000 Measurement Science Conference
Year Published: 2000
Abstract: With the advance in accuracy and stability of modern atomic clocks, the need for a very precise method of detecting instabilities in their signals has arisen. Two hydrogen masers have a drift rate of phase due to the frequency difference of 1fs per second or 3.6ps per hour. Quartzlock have developed a state of the art frequency and time interval measurement system. The A7 combines the most advanced phase comparators and PC time interval counting techniques. Stable 32 Stability analysis software is included as standard, as is a 4 way distribution amplifier and a rubidium oscillator. Initial results with a hydrogen maser reference in a temperature controlled room gave an Allen Variance Noise Floor of 5E-14, 8E-15, 1.5E-15 and 3.5E-16 for 1s, 10s, 100s and 1000s averaging times (t). Drift is as low as 5ps/hr, with a temperature sensitivity of 10ps/C. A single shot rms. resolution of 0.3ps was also measured.

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