Full 2-Port Calibration

Other topics about Basic Calibration

Overview

In full 2-port calibration, calibration data are measured by connecting an OPEN standard, a SHORT standard, or a LOAD standard on ports 1 and 2 for S-parameter (or a THRU standard between two ports).This calibration effectively eliminates the directivity error, crosstalk, source match error, frequency response reflection tracking error, and frequency response transmission tracking error from the test setup in a transmission or reflection test tat uses those ports. This calibration makes it possible to perform measurements with the highest possible accuracy. A total of twelve error terms, six each in the forward direction and the reverse direction, are used in the calibration.

 

Procedure

  1. Press Channel Next (or Channel Prev) to select the channel fof which you want to perform the calibration.

  2. Press Cal >  Calibrate > 2-Port Cal.

  3. Click Reflection.

  4. Connect an OPEN calibration standard to test port x (the connector to which the DUT is to be connected).

  5. Click Port x Open to start the calibration measurement (x denotes the test port to which the standard is connected).

  6. Disconnect the OPEN calibration standard and replace it with a SHORT calibration standard.

  7. Click Port x Short to start the calibration measurement (x denotes the test port to which the standard is connected).

  8. Disconnect the SHORT calibration standard and replace it with a LOAD standard.

  9. Click Port x Load to start the calibration measurement (x denotes the test port to which the standard is connected).

  10. Repeat the above procedure for port y.

  11. Click Return.

  12. Click Transmission.

  13. Make a THRU connection between ports x and y (between the connectors to which the DUT is to be connected).

  14. Click Port 1-2 Thru to start the calibration measurement.

  15. Click Return.

  16. If an isolation calibration must be performed using a LOAD standard, follow the procedure below.

  17. Click Isolation (Optional).

  18. Connect a LOAD standard to each of the two test ports (connectors to which the DUT is to be connected).

  19. Click Port 1-2 Isol to start the calibration measurement.

  20. Click Return.

  21. Click Done to terminate the full 2-port calibration process. Upon pressing this key, calibration coefficients are calculated and saved. The error correction function is also enabled automatically.

  Connecting standards in full 2-port calibration