How does the audio analyzer test circuit parameters?
Generally speaking, an audio analysis instrument with complete functions should be able to measure parameters such as signal AC and DC voltage, signal frequency, harmonic distortion, signal-to-noise ratio and so on. Powerful audio analysis instrument provides spectrum analysis, 1/3 octave analysis, octave analysis, sound pressure level measurement, and other functions. If you want to build an audio analysis system, you also need a standard audio generator as the source of the excitation.
One is to input sinusoidal signals into the device to be tested, and then to analyze the frequency components of the equipment response signal, so that harmonic distortion can be obtained. A more simple measurement method is the first to use bandstop filter filter response frequency components in the signal, voltage and measuring the residual signal directly, compared with the original signal, can get harmonic distortion. Obviously, second methods of harmonic distortion is THD+N, the total value of the voltage signal instead of the fundamental frequency component of voltage, so the harmonic distortion is smaller than the actual value, and the actual harmonic distortion is bigger, the greater the error.
A high precision signal source analyzer has twelve test functions including measurement level, noise, distortion, phase, intermodulation distortion, real-time dual channel ratio of amplitude, frequency jitter, real-time crosstalk, AC voltage parameters and input impedance. In general, three measurement results can be displayed simultaneously on the dot matrix liquid crystal display (LCD) on the panel. The instrument can produce sine, Fang Bo, and signals for intermodulation distortion testing. The machine contains standard tunable 1/3 Octave bandpass filtering, 400Hz high pass and 22KHz and 80KHz low-pass filters, A weighted and CCIR (QPK, ARM and RMS) weighted filtering.
