N5227B-201 2-port with configurable test set, reference mixer switch
N5227B-205 2-port with configurable test set, ref mixer switch, bias tees, low frequency extension
N5227B-210 2-port with metrology configuration
N5227B-219 2-port with configurable test set, reference mixer switch, source and receiver attenuators, bias tees
N5227B-220 2-port with configurable test set, reference mixer switch, source and receiver attenuators, bias tees, low frequency extension
N5227B-405 4-port with second source, configurable test set, reference mixer switch, bias tees, low frequency extension
N5227B-420 4-port with second source, configurable test set, reference mixer switch, source and receiver attenuators, bias tees, low frequency extension
N5227B-400 4-port with second source
N5227B-401 4-port with second source, configurable test set, reference mixer switch
N5227B-410 4-port with second source, metrology configuration
N5227B-419 4-port with second source, configurable test set, reference mixer switch, source and receiver attenuators, bias tees