In one implementation, a method is provided for testing a plasma reactor multi-frequency matching network comprised of multiple matching networks, each of the multiple matching networks having an associated RF power source and being tunable within a tunespace. The method includes providing a multi-frequency dynamic dummy load having a frequency response within the tunespace of each of the multiple matching networks at an operating frequency of its associated RF power source. The method further includes characterizing a performance of the multi-frequency matching network based on a response of the multi-frequency matching network while simultaneously operating at multiple frequencies. In one embodiment, a plasma reactor multi-frequency dynamic dummy load is provided that is adapted for a multi-frequency matching network having multiple matching networks. Each of the multiple matching networks being tunable within a tunespace. The plasma reactor dynamic dummy load being capable of simultaneously providing a frequency response within the tunespace of each of the multiple matching networks at the operating frequency of its associated RF power source.