8.4.3 PIM vs Distance Plot (iQA)
The PIM vs Distance plot is shown in Figure 30. This view is activated by pressing the PIM button at the top of the RTF
Analysis window.
Figure 30 PIM vs Distance plot
Key features of this screen are as follows:
1 Peak Marker
The peak marker is aligned with the largest peak on the trace by default, although it can be moved to neighboring peaks
using the Peak Search controls. The amplitude and location of the peak marker are printed in the top right hand corner of
the graticule.
2 Peak Search Controls
The Peak Search controls allow the user to move the peak marker left or right to the next peak on the trace.
Note:
When using the Peak Search controls, only those peaks that are above the PIM reference line are considered.
Any peaks below the PIM reference line are ignored.
3 PIM Reference Line
The PIM reference line determines the sensitivity of the Peak Search controls. Any peaks below the reference line are
ignored when moving the marker from peak to peak. To change the PIM reference line setting, touch the numeric label
immediately above the reference line and type in the desired value.
4 Autoscale Control
The autoscale control allows the user to turn autoscaling on and off on the vertical axis. When the control is colored red,
autoscaling is active and the instrument adjusts the limits on the vertical axis so that the trace occupies as much of the
screen as possible. The axis limits are updated automatically after every sweep. When the autoscale control is colored
light grey, autoscaling is turned off and the axis limits remain the same until changed by the user.
5 PIM Units
The units on the vertical axis of the plot can be toggled between dBm and dBc by touching the units tag at the top of the
axis.
1
6
5
9
2
2
4
6
7
8
7
3
10
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