Anritsu S251B 4-17, Performing a Calibration, Measurements, Press ENTER to start the calibration

Chapter 4 Measurements

Step 7. Use the Up/Down arrow key to scroll to F1, then press ENTER to select the start frequency F1.

Step 8. Enter 6, 2, 5 using the keypad or the Up/Down arrow key. Press ENTER to set F1 to 625 MHz.

Step 9. Use the Up/Down arrow key to scroll to F2, then press ENTER to select the start frequency F2.

Step 10. Enter 2, 5, 0, 0 using the keypad or the Up/Down arrow key. Press ENTER to set F2 to 2500 MHz.

Step 11. Scroll to PROP VEL and press ENTER to select Propagation Velocity parameters.

NOTE:

Propagation velocity and cable loss can be accessed by selecting CABLE FUNCTION from the DTF AID parameter table.

Step 12. Enter ., 8, 6 and press ENTER to set the Propagation Velocity to 0.86.

Step 13. Press ENTER to start the calibration.

NOTE:

If the calibration is valid, scroll to CALIBRATION VALID–CONTINUEand press ENTER. If calibration is necessary, proceed to the calibration instructions.

Performing a Calibration

This procedure is used to perform a calibration.

Step 14. At the Perform Calibration menu, follow the instructions on the display to con- nect the respective calibration components to the Site Master test port. (Refer to the calibration procedure on page 4-3.)

NOTES:

For best calibration results — compensation for all measurement system uncer- tainties — ensure that the Open/Short/Load is at the end of the test port or op- tional extension cable; that is, at the same point that you will connect the antenna or device to be tested.

For best results, use a phase stable Test Port Extension Cable (see Optional Accessories). If you use a typical laboratory cable to extend the Anritsu test port to the device-under-test, cable bending subsequent to the Open/Short/Load cal- ibration will cause uncompensated phase reflections inside the cable. Thus, ca- bles which are not phase stable may cause measurement errors that are more pronounced as the test frequency increases.

For optimum calibration, Anritsu recommends using precision calibration com- ponents.

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