Keysight Technologies N9330B, Руководство пользователя

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Using Functions
Processing Traces
43
Processing Traces
Trace overlap and trace operation are used in the tester
for post trace processing. Very useful in comparing
measurements to identify differences and faults.
Trace Operation
Trace operation mathematically adds or subtracts the
current measured trace to a previously saved trace. This
will provide information that may indicate when a cable
or antenna system is degrading in performance and
would require maintenance.i
Example: A saved a trace (data) has been entered into
the local memory of the tester. The trace was measured
under return loss mode in GSM full band (880 MHz to
960 MHz), with 521 data points.
Perform the following steps for a trace operation:
1 Press [MEAS/VIEW] > {Trace Operation} to access the
check box for selecting a math operation mode:
• Trace – Memory 
Current active trace mathematically subtracts the
trace from local memory of the tester.
• Trace + Memory 
Current active trace mathematically adds the trace
from local memory of the tester.
2 Rotate the knob to select a mode and press [ENTER].
3 The tester brings up a list of existing trace data in the
local memory the tester.
4 Rotate the knob to select a trace that has the same
measurement mode, resolution and frequency range,
and press [ENTER].
The tester displays the mathematically calculated trace
on its screen.
NOTE
The previously saved trace must have the same setup, with con-
sistent measurement parameters as the current trace. For exam-
ple, the same mode, resolution, and frequency/distance range.