Keysight N9938-90003 User’s Guide                                                            153
SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)
SA Mode Settings
—Negative Peak [#NPk] Displays the minimum value of all the 
measurements in each bucket. 
—Sample
 [#Smp] Displays the center measurement of all the 
measurements in each bucket. This setting gives a good 
representation of the random noise in each bucket. However, it does 
not ensure that all signals are represented.
—Average
 [#RMS] Displays the Root Mean Squared (RMS) average 
power of all the measurements in each bucket. This is the preferred 
method when making power measurements.
Display Line
A display line is a simple, horizontal line that can be placed at any amplitude 
level on the SA screen or set to any level in IQA. Use a display line as mental 
guide for visual feedback. A display line is similar to a Limit Line, except that no 
PASS/FAIL testing occurs. A display line is easier to create than a Limit Line. 
Learn more in “All about Limit Lines” on page 205.
Figure 7-10 Display Line with Annotations
How to create and move a Display Line
—Press Limit_8 
—Then Display Line OFF ON
— Then enter a Y-axis value using the   arrows or the rotary knob, then 
press Enter
. Or enter a value using the numeric keypad and press a suffix 
key or press Enter
.