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<blockquote data-quote="HNaga" data-source="post: 5517590" data-attributes="member: 603453">As mentioned in DSSF manualTHD analyzer measures the Total Harmonic Distortion of the system. THD is a measure to evaluate the linearity of the system,and it is defined as the ratio of the geometric mean of the harmonic components (v1, v2, v3, v4, v5, ... v30) and thefundamental component (v1) when the sinusoidal wave is inputted to the system. Usually it is expressed in dB or %.In the THD analyzer, three different measurements are available: a) manual measurement, in which the distortion ismeasured for the specific frequency and the output level, b) frequency sweep measurement, in which the measurementfrequency is changed automatically, and c) level sweep measurement, in which the output level is changed automatically.THD analyzer can measure the distortion of the amplifier very effectively. For example, connect the soundcard&#039;s output to theamplifier, and connect the amplifier&#039;s output to the soundcard&#039;s input. You don&#039;t need to connect the soundcard&#039;s output andinput directly. THD analyzer compares the input and the output signals automatically and gives the result (distortion).Measurement result can be saved as a screen picture. MMLIB can be used to manage the image file.</blockquote>

[QUOTE="HNaga, post: 5517590, member: 603453"] As mentioned in DSSF manual THD analyzer measures the Total Harmonic Distortion of the system. THD is a measure to evaluate the linearity of the system, and it is defined as the ratio of the geometric mean of the harmonic components (v1, v2, v3, v4, v5, ... v30) and the fundamental component (v1) when the sinusoidal wave is inputted to the system. Usually it is expressed in dB or %. In the THD analyzer, three different measurements are available: a) manual measurement, in which the distortion is measured for the specific frequency and the output level, b) frequency sweep measurement, in which the measurement frequency is changed automatically, and c) level sweep measurement, in which the output level is changed automatically. THD analyzer can measure the distortion of the amplifier very effectively. For example, connect the soundcard's output to the amplifier, and connect the amplifier's output to the soundcard's input. You don't need to connect the soundcard's output and input directly. THD analyzer compares the input and the output signals automatically and gives the result (distortion). Measurement result can be saved as a screen picture. MMLIB can be used to manage the image file. [/QUOTE]

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