By T. W. Kerlin
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Extra resources for Frequency Response Testing in Nuclear Reactors
Barnes and Noble, New York, 1970. CHAPTER 3 Properties of Important Test Signals In this chapter, the important signals for use in frequency response tests are considered. As described in the previous chapter, Fourier analysis can be used to obtain frequency response information from nonsinusoidal tests that use periodic or nonperiodic input disturbances. We restrict our attention to those currently k n o w n test signals that are practical to input with standard reactor hardware and that have power spectra that can give results over frequency ranges of interest.
For a Ζ bit sequence, there are (Z 4- l)/2 zero crossings. This gives the number of shifts required of the input hardware per period and may be useful for assessing possible wear on this hardware during a test. (2) Runs. Successive occurrence of one of the states is called a run. There are (Z + l)/2 runs per period. Half of the runs are of one-bit length; onefourth are of two-bit length ; one-eighth are of three-bit length ; and so on, provided that the number of bits generated is greater than 1.
Nevertheless, there has been some interest in the P R T S signal, and a discussion of its characteristics is included here. f See the literature (32, 38, 49, 50, 56-61).