User`s guide

304 Agilent E5505A User’s Guide
12 AM Noise Measurement Examples
AM Noise with N5500A Option 001
This example demonstrates the AM noise measurement of an 8662A signal
generator using the AM detector in the N5500A Option 001 phase noise test
set. For more information about various calibration techniques, refer to
Chapter 11, “AM Noise Measurement Fundamentals.
This measurement uses the double sided spur calibration method.
The measurement of a source with amplitude modulation capability is among
the simplest of the AM noise measurements. The modulation sidebands used to
calibrate the AM detector are generated by the DUT. Required Equipment
Required equipment
This measurement requires an 8644B in addition to the phase noise test
system and your DUT. You also need the coaxial cables and adapters necessary
to connect the DUT and reference source to the test set.
Figure 237 shows the configuration used for an AM noise measurement.
Defining the measurement
1 From the File menu, choose Open.
2 If necessary, choose the drive or directory where the file you want is stored.
CAUTION
To prevent damage to the test set’s components, do not apply the signal input
connector until the input attenuator has been correctly set for the desired
configuration, as show in Tab l e 47 on page 311. Apply the input signal when the
connection diagram appears
NOTE
To ensure accurate measurements allow the DUT and measurement equipment to warm
up at least 30 minutes before making the noise measurement.
Figure 237 AM noise measurement configuration
DUT
Signal
input
Test set