a method for using a test data packet signal to test a data packet signal transceiver device under test having an operating characteristic defined by a data packet error rate as a function of data packet signal power . the test data packet signal power is varied and a test per is computed as a function of dut response data packets and test data packets until a measured test per or a computed test per extrapolated from measured pers is equal to a predetermined per less than and greater than maximum and minimum pers , respectively .