Per forming a cal i bra tion 4-17, Performing a calibration -17 – Anritsu S251B User Manual
Page 63
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–CONTINUE
and 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.
4-17
Chapter 4 Measurements