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NIST Technical Note 1337: Characterization of Clocks and Oscillators

NIST Technical Note 1337: Characterization of Clocks and Oscillators

NIST Technical Note 1337: Characterization of Clocks and Oscillators

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29. page TN-180If the ratio <strong>of</strong> T/ T is constant <strong>and</strong> greater than 1 (the usual case), the problem describedis eliminated. However, in taking data for a plot <strong>of</strong> Oy( T) versus T, it is difficult toachieve this in the hardware <strong>and</strong> not possible to do it with s<strong>of</strong>tware processing alone. Forfurther discussion see paper D.8 (page TN-296).30. page TN-197The most recent definitions <strong>and</strong> concepts for spectral density are given in a new IEEEst<strong>and</strong>ard (paper CIon page TN-B8). This new st<strong>and</strong>ard should be consulted as the latestauthority on definitions <strong>and</strong> terminology.31. page TN-198The newly accepted definition <strong>of</strong> ~(f) is given in paper Cl. This new definition, ~(f) ==Y2Sif), was always valid for Fourier frequencies far from the carrier. It has now beenextended to cover all frequencies.32. page TN-217Equation (73) should read 20 log (final frequency/original frequency).33. page TN-239On page TN-198 the authors refer to a paper by Glaze (1970). The reference, apparentlylost in printing, is: Glaze, D.J. (1970). "Improvements in Atomic Beam Frequency St<strong>and</strong>ardsat the National Bureau <strong>of</strong> St<strong>and</strong>ards, "IEEE Trans. Instrum. Meas. IM-19(3), 156-160.34. page TN-257There are two errors in Table 2. Under R(n) the first entry should be l/n rather than 1.The second item in the same column is not single valued (1), but takes on different valuesfor different measurement b<strong>and</strong>widths. The reader is referred to section A.6 (page TN-9)for a discussion <strong>of</strong> this topic.35. pages TN-261 <strong>and</strong> TN-262Subsequent work on moda~T) <strong>and</strong> R(n) is reported in section A.6 (page TN-9) <strong>of</strong> thisreport. There are some differences between the results in A.6 <strong>and</strong> the ones reported inTables I <strong>and</strong> II <strong>and</strong> Figure 4 in this paper.36. page TN-264To be consistent with other papers in the literature, ¢(t) in eq (1) should probably bewritten as xl(t).37. page TN-268The term e(t) in eq (3) is normally used to represent the amplitude fluctuations in theoutput voltage <strong>of</strong> an oscillator. This term might be better designated Y1(t).TN-342

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