Anritsu S251B - Manual (Page 66)

DTF Measurement (Determining the quality of the cable.)
NOTE:
If cable length measurement has not been done, calibration must be done be-
fore determining the quality of the cable (steps 1-15).
Step 24. Disconnect the Short and connect the Load to the test port extension cable
Setting the Amplitude Scale
Step 25. Press the AMPLITUDE or LIMIT key to call up the Scale Menu..
Optional: Press the AUTO SCALE key to optimize the amplitude scale.
Step 26. In SWR mode, press the TOP soft key and enter 1, ., 0, 5 using the keypad or
Up/Down arrow key. Press ENTER to set the top scale. (In Return Loss mode,
enter 20.)
Step 27. In SWR mode, press the BOTTOM soft key and enter 1 using the keypad or
Up/Down arrow key. Press ENTER to set the bottom scale. (In Return Loss
mode, enter 54.)
Setting the Markers
Step 28. Press the MARKER key to call up the Markers menu.
Step 29. Press the M2 soft key to select the M2 marker function. (Note: pressing the
ON/OFF soft key activates or deactivates the M2 marker function.)
Step 30. Press the MARKER TO PEAK soft key to find the maximum SWR or Return
Loss reading. (See Figures 4-15 and 4-16.)
NOTE:
Refer to page 4-4 for instructions on saving and recalling a setup or display.
4-20
Chapter 4 Measurements