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4 Requiring more test information The frequency-only measurements were postulated as sufficient in [1], but our experience shows that, in many cases, they lead to relatively poor fault coverage rates [25]-[41]. From a rigorous defect-driven viewpoint, it has been demonstrated elsewhere [25]-[41] and discussed in previous sections that measuring the oscillation frequency may not be enough to achieve a reasonable fault coverage. In fact, there is also a clear evidence of this matter in Arabi and Kaminska references [2], where authors set out that a single oscillation frequency is not enough to cover all target faults.

In both cases, the stabilization of the oscillation signal is not attained in the saturation range of the amplifier because other factors determine this phenomenon. As mentioned before, by introducing an extra nonlinear mechanism, we have two parameters to play with. Two test parameters would be available to distinguish if a fault is in the amplifier or in the added circuitry, for example. Nevertheless, these nonlinear mechanisms require to handle complex nonlinear analysis techniques to establish with precision the steady-state output [100].

7: Frequency Deviations in relation to a exceeds the limit of 500, a deviation of the ideal frequency translates into a similar deviation of the actual frequency, regardless of the value of α . 1, to verify the oscillation condition 9 α > --- , until 459, in order not to exceed the upper limit of 500). Then, it can 2 be seen from Fig. 8 that as α is regarded smaller, a deviation of its value translates into a higher deviation of the actual frequency and, of course, it occurs independently the value of the ideal frequency value.

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Air Engine


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