| 摘要 |
The invention relates to a method for calibrating a test apparatus, having a first and a second directional coupler (200, 202), for gauging a two-port test object (20) that has a first port (114) and a second port (118) in a calibration plane, wherein for the purpose of calibrating the test apparatus a vectorial network analyser (204) having a first, a second, a third, a fourth, a fifth and a sixth test port is connected to the first and second ports in the calibration plane such that the first test port (206) is connected to the first port in the calibration plane (16), the second test port (208) is connected to the second port in the calibration plane, the third and fourth test ports (210, 212) are connected to the first directional coupler and the fifth and sixth test ports (214, 216) are connected to the second directional coupler via a respective waveguide for electromagnetic waves. For different calibration standards, scatter parameters are determined for each desired frequency point and are used to calculate a respective scatter matrix that describes the transmission via the directional couplers. For the different calibration standards, corrections to the scatter matrix are made in order to obtain a corrected scatter matrix. The scatter parameters of the corrected scatter matrix are used to determine terms for error matrices for signal transmission between the test ports on the one hand and the ports on the other hand using a predetermined calibration algorithm. |
