Other topics about Basic Calibration
In full 4-port calibration, calibration data are measured by connecting an OPEN standard, a SHORT standard, or a LOAD standard to the four test ports (or a THRU standard between the four ports). This calibration effectively eliminates the directivity error, crosstalk, source match error, load match error, frequency response reflection tracking error, and frequency response transmission tracking error from the test setup in a transmission or reflection test using those ports. As in full 2-port calibration, this calibration method also makes it possible to perform measurements with the highest possible accuracy. There are unique error terms for directivity, source match, and reflection tracking for each stimulus test port (3 × 4 ports = 12). As for isolation, load match, and transmission tracking errors, there are unique terms for each combination between a stimulus port and a response port (3 × 12 combinations = 36). Therefore, in total, 48 error terms are involved in a full 4-port calibration.
System Z0 should be changed to 1 ohm before calibration when using waveguide calibration kit and measuring waveguide devices.
Press Channel Next/Channel Prev keys to select the channel for which you want to perform the calibration.
Press Cal key.
Click Calibrate > 4-Port Cal.
Click Reflection.
Connect an OPEN calibration standard to test port 1.
Click Port 1 Open to start the calibration measurement.
If you select the calibration kit which has different calibration definitions for each gender, (m) and (f) in the name (label) of the standard displayed in the softkey indicate male (m) and female (f) for the analyzer's connector, respectively.
Disconnect the OPEN calibration standard and replace it with a SHORT calibration standard.
Click Port 1 Short to start the calibration measurement.
Disconnect the SHORT calibration standard and replace it with a LOAD standard.
Click Port 1 Load to start the calibration measurement.
Repeat the above procedure for ports 2, 3 and 4.
Click Return.
Click Transmission.
Make a THRU connection between ports 1 and 2.
Click Port 1-2 Thru to start the calibration measurement.
Repeat above procedure ports 1 and 3.
Repeat the procedure on ports 1 and 4.
Repeat the procedure on ports 2 and 3.
Repeat the procedure on ports 2 and 4.
Repeat the procedure on ports 3 and 4.
Click Return.
If an isolation calibration must be performed using a LOAD standard, follow the procedure below.
Click Isolation (Optional).
Connect a LOAD standard to each of the four test ports (connectors to which the DUT is to be connected).
Click Port 1-2 Isol to start the calibration measurement.
Perform the each calibrations by clicking Port 1-3 Isol, Port 1-4 Isol, Port 2-3 Isol and Port 2-4 Isol.
Click Return.
Click Done to terminate the full 4-port calibration process. Upon pressing this key, calibration coefficients will be calculated and saved. The error correction function will also be automatically enabled.
Connecting standards in full 4-port calibration
