Agilent Technologies E5500A User Manual page 336

NOTE
Figure 12-16
Figure 12-17
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
modulation rate between 10 Hz and 20 MHz.
The carrier-to-sideband ratio

C percentAM
----------------------------- -
---- -
= 20 log

sb 100
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.
Measuring Carrier-to-Sideband Ratio
4. Enter the carrier-to-sideband ratio and offset frequency, then measure
the calibration constant.
Measuring the Calibration Constant
5. Remove the AM source and reconnect the DUT.
6. Measure noise data and interpret the results.
Agilent Technologies E5500 Phase Noise Measurement System 12-15
AM Noise Measurement Fundamentals
Method 2: Double-Sided Spur
C
for AM is:
-----
sb

= 6dB
