90
Measuring Noise
Improving Phase Noise Measurements by Subtracting Signal Analyzer Noise
Figure 7-12 Measurement of Analyzer Noise
8 Subtract the noise from the
DUT phase noise
measurement using the
Power Diff math function.
a. Press Trace/Detector, Select Trace,
Trace 3, Clear Write.
b. Press More, More, Math, Power
Diff, Trace Operands, Operand 1,
Trace 1, Operand 2, Trace 2.
Notice the phase noise
improvement at 100 kHz
offset between trace 1
(yellow trace) and trace 3
(magenta trace).
See Figure 7-13.
Step Action Notes
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