Standard test signal
Appearance
In telecommunication, a standard test signal is a single-frequency signal with standardized level used for testing the peak power transmission capability and for measuring the total harmonic distortion of circuits or parts of an electric circuit.
Standardized test signal levels and frequencies are listed in MIL-STD-188-100 and in the Code of Federal Regulations Title 47, part 68.
References
This article incorporates public domain material from Federal Standard 1037C. General Services Administration. Archived from the original on 2022-01-22. (in support of MIL-STD-188).
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the standard test signals are used to judge the performance of a system like any control system or any other network in the electrical engineering
if suppose you have only black box view of the system in hand then you can find the performance of this system by applying the test signals and
find the behavior of the system.