DTF Measurement (Determining the Length of the Cable)
Step 15. Disconnect the Load and connect the test port extension cable to the Site Master
test port.
Step 16. Connect the Short to the open end of the test port extension cable.
Setting the Amplitude Scale
Step 17. Press the
AMPLITUDE
or
LIMIT
key to call up the Scale Menu.
Optional: Press the
AUTO SCALE
key to optimize the amplitude scale.
Step 18. In SWR mode, press the
TOP
soft key and enter 3, 0 using the keypad or
Up/Down arrow key. Press
ENTER
to set the top scale. (In Return Loss mode,
enter 0.)
Step 19. 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 Marker
Step 20. Press the
MARKER
key to call up the Markers menu.
Step 21. Press the
M1
soft key to select the M1 marker function. (Note: pressing the
ON/OFF
soft key activates or deactivates the M1 marker function.)
Step 22. Press the
MARKER TO PEAK
soft key to find the cable length.
Step 23. Press the
BACK
soft key or the
ESCAPE
key to return to the previous menu.
Figures 4-8 and 4-9 show cable length displays in SWR and Return Loss modes.
NOTE:
Refer to page 4-4 for instructions on saving and recalling a setup or display.
4-14
Chapter 4 Measurements