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IMD Testing of Amplifiers - W0QE
http://www.w0qe.com/Technical_Topics/imd_testing_of_amplifiers.html#:~:text=Test%20Procedure%3A%201.%29%20Decide%20on%20the%20frequencies%20to,the%20amp%20into%20a%20dummy%20load%20or%20high
Online Intermodulation Distortion (IMD) Sound Test
https://www.audiocheck.net/testtones_imd.php
IMD measurements use a two sine wave test signal consisting of a large amplitude low frequency tone linearly mixed with a high-frequency tone at much lower amplitude. The most common standard is SMPTE/DIN which uses 60 Hz, 7 kHz and a 4:1 ratio (12 dB).
IMD Testing of Amplifiers - W0QE
http://www.w0qe.com/Technical_Topics/imd_testing_of_amplifiers.html
than some Yaesu models operating in class A, have good enough IMD to test a high quality amplifier. 2.) Another method is to start with 2 crystal oscillator or very clean RF signal generator sources and combine
IMD - Audio Precision
https://www.ap.com/technical-library/imd/
Inter-Modulation Distortion measurements are made by stimulating a device with a complex signal made up of two component sinewaves. A non-linear device will reproduce the two original sinewaves plus a number of IMD products expressed by the equation mF1 + nF2, where m and n are integers and F1 and F2 are the frequencies of the two component sinewaves.
Intermodulation Distortion (IMD)
https://sound-au.com/articles/intermodulation2.htm
Given that the ITU-R IMD test based on IEC60118 and IEC60268 (apparently) rely on detection of the difference frequency, as discussed in Intermodulation (?) - Something 'New' To Ponder , amplifiers with symmetrical distortion will fail to provide a reliable result (they may fail to give a result at all - even though the amplifier may have considerable IMD).
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