Build From Trace; Limit Options - Keysight N9912A User Manual

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 156. 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 Trace. A limit line table appears.
Build From
 Use the ▲|▼ arrows to select ON.
 Use to shift the limit line UP or DOWN. Learn how below.
Offset

Limit Options

How to set Limit Options
 Press if the limit table is visible.
Exit
 Then Options.
 Then choose from the following:
Beep
o
Audible beep sounds when a sweep passes.
o
On Pass
158 FieldFox User's Guide