S331L UG PN: 10580-00321 Rev. M 3-19
Cable and Antenna Measurements 3-4 Line Sweep Measurements
3. Press the Distance submenu key and then select DTF Aid. Use the
touchscreen, rotary knob, or Up/Down arrow keys to navigate
through all the DTF parameters.
a. Highlight a parameter in the DTF Aid table to edit, then
press Edit or Enter to display a parameter for editing.
b. Edit all required parameters and then highlight Keep
current values -- CONTINUE and press Enter.
4. Connect a phase-stable Test Port cable to the RF Out/Reflect In
connector on the Site Master. Press the Calibration main menu
key to start calibration of the instrument. Refer to Chapter 7 for
details.
5. Connect the Site Master to the Device Under Test using the
calibrated phase-stable test port cable.
Example 1 – DTF with a Short to Measure Cable Length
To measure the length of a cable, DTF measurements can be made with
an open or a short connected at the end of the cable. The peak indicating
the end of the cable should be between 0 dB and 5 dB. In Figure 3-14
on page 3-20 the cable end is at 20.5 meters.
The cable end was found by selecting Marker 3 (Marker > Select M(1-8)
> M3) then using searching for the trace peak (Marker > Marker Search >
Marker to Peak).
Note
If Stop Distance is greater than DMax, increase the number of
data points.
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