16- 14 Keysight N9912-90001 User’s Guide
Data Analysis Features
All about Limit Lines
16-
All about Limit Lines
Limit lines are visual representations, drawn on the FieldFox screen, of the
specified limits for a measurement. With this capability, you can easily
compare measured data versus specifications. Optionally, you can enable an
audible beep and display Pass or Fail information for each measurement.
— You can have up to as many limit line segments as there are data points for
each measurement trace allowing you to test all aspects of your
measurements.
— Limit lines are available in CAT Mode, NA Mode, and SA Mode. Power Meter
Mode uses different limit settings. Learn more in “Limits” on page 11-8.
— Limit lines and limit testing are NOT allowed in NA Mode with Smith Chart
or Polar display formats.
— A simple Display Line is also available in SA Mode ONLY. Learn more in
“Display Line” on page 8-31.
— Limit lines can be saved and recalled with an *.sta file. Learn more in
“Saving and Recalling Files” on page 17-2. They can also be saved and
recalled independently from the Limit softkeys. Learn more in“How to Save
and Recall Limits” on page 16-17.
How to Create Fixed Limit Lines
There are two ways to build a Fixed limit line:
1. Build (limits) From a Trace. Learn how in “Build From Trace” on
page 16-16.
2. Enter X/Y data points into the on-screen editor. The limit line is formed as
the FieldFox ‘connects the dots’ on the screen. To create frequency gaps
that are NOT tested, use separate limit lines. The X-axis values for two
lines can overlap.
—Press Limit 8
.
—Then Edit Limits
. A limit line table appears.
— Use the Up / Down arrows and rotary knob to navigate the cursor to the
following editable cells.
— Description - Press Edit
, then enter a description for the limit line
using the FieldFox labeler. Learn how in “How to use the FieldFox
labeler” on page 17-3.
— Fixed/Relative – Press Edit
to toggle between the following:
——Fixed - the limit line does not move. The X/Y coordinates are
absolute locations on the screen.
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