User`s guide

Agilent Technologies E5500 Phase Noise Measurement System 12-15
AM Noise Measurement Fundamentals
Method 2: Double-Sided Spur
3. Using a source with AM, set its output power equal to the power
measured in step 2. The source should be adjusted such that the
sidebands are between –30 and –60 dB below the carrier with a
modulationratebetween10Hzand20MHz.
NOTE The carrier-to-sideband ratio for AM is:
To check the AM performance of the source, measure the
carrier-to-sideband ratio of the AM at the source output with a modulation
analyzer.
Figure 12-16 Measuring Carrier-to-Sideband Ratio
4. Enter the carrier-to-sideband ratio and offset frequency, then measure
the calibration constant.
Figure 12-17 Measuring the Calibration Constant
5. Remove the AM source and reconnect the DUT.
6. Measure noise data and interpret the results.
C
sb
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C
sb
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20
percentAM
100
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log 6dB==