Keysight Technologies FieldFox N9918A User Manual

Data Analysis Features
All about Limit Lines
Keysight N9927-90001 User’s Guide 613
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, NF Mode, and SA Mode. Power Meter Mode
uses different limit settings. Learn more in “Limits” on page 458.
— 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 I/Q Analyzer, NF, and SA Modes ONLY. Learn more in
“Display Line (I/Q, NF, and SA Modes Only)” on page 617.
— Limit lines can be saved and recalled with an *.sta file. Learn more in“How to Save and Recall
Limits” on page 616. They can also be saved and recalled independently from the Limit softkeys.
Learn more in“How to Save and Recall Limits” on page 616.
How to Create Fixed Limit Lines
There are two ways to build a Fixed limit line:
1. 1. Build (limits) From a Trace. Learn how in “Build From Trace” on page 614.
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 674.
— 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.
——Relative - the limit line moves relative to the center frequency and acquisition.
Note: It is easiest to first create Fixed Limits, then change this setting to Relative.
Learn more “Relative Limit Lines” on page 614.
— Upper/Lower – Press Edit
to toggle between the following:
IMPORTANT! For CAT and NA modes, limit lines do not apply
where F1 = F2.

Keysight Technologies FieldFox N9918A Specifications

General

Brand	Keysight Technologies
Model	FieldFox N9918A
Category	Measuring Instruments
Language	English