If the return loss fails the Pass/Fail threshold, the following warning message is displayed:
The user can now choose to abort the measurement and return to the RTF Analysis window, or continue with the PIM
sweep. If the user chooses to continue, the instrument will turn on the two high-power transmit carriers and perform the
sweep.
Note:
The accuracy of PIM vs Distance measurements can be adversely affected by large return loss faults in the device
under test. Therefore it is strongly recommended that any large return loss faults be repaired prior to performing PIM vs
Distance measurements.
5. Upon completion of the PIM sweep, the high-power transmit carriers are automatically turned off, and the results of
the sweep are displayed on the screen.
8.4
Analyzing the Results of an RTF Sweep
The results of an RTF measurement can be viewed in four different display modes:
• Basic Display
• PIM vs Distance Plot
• Return Loss vs Distance Plot
• Overlay of PIM & Return Loss vs Distance Plots
Details of these display modes are provided in the following sections.
8.4.1 Basic Display Mode
Basic display mode is the default results screen. It is activated by pressing the BASIC button at the top of the RTF
Analysis window. The format is a simple numerical readout of the location and amplitude of the largest PIM fault in the
device under test, as shown in Figure 20
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