One of the main tasks in measurement technique is to reduce measurement errors. In the six-port measurement technique, the measurement error of load reflection coefficients is mainly caused by the errors in measuring power. It is very important to reduce and eliminate the error in measuring power for the enhance ment of the measuring precision in load reflection coefficients. One of the main tasks in measurement technique is to reduce measurement errors. In the six-port measurement technique, the measurement error of load reflection coefficients is mainly caused by the errors in measuring power. It is very important to reduce and eliminate the error in measuring power for the enhance ment of the measuring precision in load reflection coefficients.