16- 16 Keysight N9912-90001 User’s Guide
Data Analysis Features
All about Limit Lines
16-
How to Create a Relative Limit Line
The easiest way to create a Relative limit line is to create a Fixed Limit at a
specific center frequency and reference level. Learn how “Relative Limit Lines”
on page 16-15. Then change the limit line to Relative. The X/Y data points will
be re-calculated relative to the center frequency and reference level.
Build From Trace
A limit line can be built from an existing trace. One X/Y point is made from each
measured data point. Then, using an offset value, you can shift the limit line UP
for upper limits or DOWN for lower limits.
Once limit lines have been built from the trace, changes that you make to the
trace, such as frequency range, do NOT change the limits. However, the limit
line properties can be edited just like standard limit lines.
Figure 16-6 A lower limit line (red) built from the trace (yellow) shifted down 5 dB.
How to Build Limit Lines from a Trace
— Select the trace from which limits will be built.
—Press Limit 8
.
—Then Edit
.
—Then Build From Trace
. A limit line table appears.
— Use the arrows to select ON.
—Use Offset
to shift the limit line UP or DOWN. Learn how below.
Build from Trace is NOT allowed for traces with more than 1001 data
points.
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