HP 3048A Operating Manual page 66

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 STABLE RF OSCILLATOR.
The appropriate measurement definition parameters for
this example have been pre-stored in this file.
4. Press the Load File key.
5. After the system has completed the file loading
sequence, press the
Done
key. (Table 3-3 lists
the parameter data that has been entered for this
measurement example.) Note that the source parameters
entered for step 2^pn the table may not be appropriate
for the sources you are using.
Instr. Params key, 6. To change these values, press the
and enter the carrier (center) frequency of your DUT
(5 MHz to 1.6 GHz). Enter the same frequency for the
Detector Input Frequency.
7. Enter the estimated Tuning Constant (tuning
sensitivity in Hz/V), Tuning Curve Center Voltage
and Range, and Tune-Port Input Resistance for the
VCO source you are using.
Note
If you do not know the exact Tuning Constant for your VCO
source, an estimate that is within a factor of 2 is close
enough as long as you have the HP 3048A measure the
exact value for you before it makes its noise measurement. If
you estimate the Tuning Constant, enter the input resistance
as 1 E + 6. If you do know the exact Tuning Constant, enter
it and enter the actual input resistance of your VCO.
8. When you have completed these operations, press
Done
press
Level
to exit the parameter entry menu, and then
again to return to the Main Software
Done
3-16 Signal Source Applications