User`s guide

160 Agilent E5505A User’s Guide
6 Absolute Measurement Examples
RF Synthesizer Using DCFM
This measurement example will help you measure the absolute phase noise of
an RF synthesizer using DCFM.
Required equipment
This measurement requires an Agilent 8257x with a DCFM Input port, in
addition to the phase noise test system and your DUT. (For more information,
see “Selecting a reference source" on page 132.) You also need the coaxial
cables and adapters necessary to connect the DUT and reference source to the
test set.
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.
3 In the File Name box, choose “RFSynth_DCFM.pnm”. See Figure 108.
CAUTION
To prevent damage to the test set’s components, do not apply the input signal to
the signal input connector until the input attenuator has been correctly set for the
desired configuration, as shown in Tab l e 2 1 on page 167. 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 108 Select the parameters definition file