Keysight Technologies N9330B, User Manual

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Using Functions 
Processing Traces
44
Trace overlap
The tester allows a previously saved trace to be recalled
onto the currently displayed screen. The two displayed
traces are identified by different colors.
Trace overlap is a real-time tool for quick comparisons
between the current trace and a previously saved trace.
The tester cannot save the overlaid traces into either
local memory or external USB memory stick.
Example:
To compare the current measurement trace
to a saved trace (data) in the local memory of the tester.
They were both measured in the return loss mode, GSM
full band (880 MHz to 960 MHz), resolution 521 points.
Perform the following steps to do a trace overlap
operation:
1 Press
[MEAS/VIEW] > {Trace Overlap} > {Select Trace}
to display a list of trace data stored in the local
memory of the tester.
2 Use the front-panel knob to select a trace and press
[ENTER]
.
The tester will display the saved trace, while
continuously making measurement of the DUT (current
measured trace). The two traces are displayed on the
screen simultaneously:
• Trace one is displayed as a static trace and is green
in color. It is the saved trace results recalled from
the local memory of the tester.
• Trace two is yellow in color and is repeatedly
scanned. It is the currently measured trace result.
NOTE
The previously saved trace must have consistent 
measurement parameters with the current trace. For example, the
same mode, resolution, and frequency/distance range.