Keysight N9923-90001 User’s Guide185Data Analysis FeaturesAll about Limit LinesAll about Limit LinesLimit lines are visual representations, drawn on the FieldFox screen, of thespecified limits for a measurement. With this capability, you can easilycompare measured data versus specifications. Optionally, you can enable anaudible 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 foreach measurement trace allowing you to test all aspects of yourmeasurements.— Limit lines are available in CAT Mode, NA Mode, and SA Mode. Power MeterMode uses different limit settings. Learn more in “Limits” on page 133.— Limit lines and limit testing are NOT allowed in NA Mode with Smith Chartor Polar display formats.— Limit lines can be saved and recalled with an *.sta file. Learn more in “RecallFiles” on page 195. They can also be saved and recalled independentlyfrom the Limit softkeys. Learn more in“How to Save and Recall Limits” onpage 188.How to Create Fixed Limit LinesThere are two ways to build a Fixed limit line:1. Build (limits) From a Trace. Learn how in “Build From Trace” on page 187.2. Enter X/Y data points into the on-screen editor. The limit line is formed asthe FieldFox ‘connects the dots’ on the screen. To create frequency gapsthat are NOT tested, use separate limit lines. The X-axis values for twolines can overlap.— Press Limit 8.— Then Ed it Limits. A limit line table appears.— Use the Up / Down arrows and rotary knob to navigate the cursor to thefollowing editable cells.— Description - Press Ed it, then enter a description for the limit line using theFieldFox labeler. Learn how in “How to use the FieldFox labeler ” onpage 193.—Fixed/Relative – Press Ed it to toggle between the following:——Fixed - the limit line does not move. The X/Y coordinates areabsolute locations on the screen.——Relative - the limit line moves relative to the center frequencyand reference level. Note: It is easiest to first create FixedLimits, then change this setting to Relative. Learn more“Relative Limit Lines” on page 186.—Upper/Lower – Press Ed it to toggle between the following: