160 FieldFox User’s Guide
Each limit line can be changed at any time from Fixed to Relative, and Relative to
Fixed.
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 on page 158. 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.
A lower limit line (red) built from the trace (yellow) shifted down 5 dB.
How to Build Limit Lines from a Trace
NOTE Build from Trace is NOT allowed for traces with more than 1001 data points.
Select the trace from which limits will be built.
Press Limit 8.
Then Edit Limits.
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.
Limit Options
How to set Limit Options
Press Exit if the limit table is visible.
Then Options.
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