HP 3048A Operating Manual page 159

Note To ensure accurate measurements, you should allow the
DUT and measurement equipment to warm up at least
30 minutes before making the noise measurement.
Defining the Measurement
1. Press the Define Msrmnt key which is available at the
Main Software Level on the HP 3048A.
2. Press the Test Files key.
Move the cursor down until it is positioned at the file
labeled "HP EXAMPLE AM NOISE (HP 8662/3 and
HP 33330C)". The appropriate measurement parameters
for this example have been pre-stored in this file.
4. Press the Load File softkey.
5. After the system has completed the file loading
sequence, press the |Done| softkey. Parameter entry is
now completed for this measurement example. (Table
3-23 lists the parameter data that has been entered for
this measurement example.)
Note The stop frequency for the stored measurement is 100 kHz
so the example will run on a standard HP 3048A system. If
you have an RF analyzer configured in your system, you
may want to change the stop frequency to 40 MHz in the
Type/Range parameter menu. This will allow you to
measure over the entire offset range of the HP 3048A.
The amplitude of a source under system control, for an AM
noise measurement, will automatically be set to +10 dBm. If
any other amplitude is desired, the source should be placed
under manual control in the Source Control menu. All other
measurements set the source to +16 dBm automatically.
6. Press Done to return to the Main Software Level.
3-112 Signal Source Applications