Patent ID: 7519509

Claim:
A network analyzer that is connected to a test set that comprises network analyzer side ports, device under test side ports that are connected to a device under test, and a port connecter that selects any one of the device under test side ports, and connects the selected device under test side port to one of the network analyzer side ports, wherein the device under test side ports constitute a main port group and a sub port group whose connection to the network analyzer side ports is independently set, the network analyzer comprising: transmission and reception ports that are connected to the network analyzer side ports one by one, and are used to transmit and receive a signal; a transmission tracking error determiner that determines a transmission tracking error of a combination of one of the possible connections of the main port group and one of the possible connections of the sub port group for all the possible connections of the main port group based on a signal prior to transmission by said transmission and reception port, and a reception signal; and a transmission tracking error deriver that derives a transmission tracking error other than the transmission tracking errors determined by said transmission tracking error determiner based on the transmission tracking error determined by said transmission tracking error determiner.