Intermodulation distortion¿its significance

Arguments are put forward to show that for the majority of applications, intermodulation testing has little advantage over the simpler total harmonic testing methods, which are well known. For those special cases where the intermodulation test methods are justified, great care must be taken in the design of equipment, to ensure reasonable accuracy of results. Phase shifts in filters, among other factors, may affect peak values considerably, and results mean little on an absolute basis unless full details of test conditions are quoted. A typical test equipment is described.