This type of test is conducted on Control Valves.

If a control valve is subject to a sinwave signal, then its response normally falls behind in phase from its signal, in addition, the magnitude of the response of the valve is reduced at high frequencies.

Control valves are prone to hunting, this is a phenomena that if a control valve is subjected to a sinwave signal and if the dynamic natural response of the valve is in phase with the frequency of the sinwave, then the control valve does not become stable, and its signal is magnified many times.

Thermodyne Engineering Ltd. performs such tests. The dynamic characteristics of control valves are determines in phase shift and response. The hunting characteristics are also determined.

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