HP 70427A User Manual page 527

Performance Tests
Test 2 - Phase Noise and Spurs (mW LO)
5. Set tuning sensitivities to 20 ppm/V
Do this on the reference source and the DUT.
a. Press the
Ref Chain
b. Press the
Tune Sens
c. Press the
20 ppm/V
d. If necessary, make the other module active by pressing the
key followed by the
display the module's softkeys.
6. Set the reference source and DUT frequency to 2.4 GHz
a. Press the
Output
b. Press the softkey.
FREQ
c. Enter 2.4 with the numeric keypad.
d. Press the softkey.
GHz
e. If necessary, make the other module active by pressing the
key followed by the
display the module's softkeys.
7. Run the phase-noise measurement
When the phase-noise measurement program stops to prompt a zero-beat
adjustment, do the following:
a. Turn the HP 70428A Option K01 on.
b. Adjust the pot on the HP 70428A Option K01 for a zero beat with 4
kHz. If necessary, switch the NORMAL/REVERSE switch and turn
the pot in the other direction.
c. Press to continue with measurement.
Proceed
8. Print a graph and parameter summary
On the HP 3048A controller press the
Step 7 - Measure Phase Noise at 12.6 GHz (20 ppm/V)
1. Specify measurement type and frequency range
•
Start freq: 10 Hz
2. Enter source and interface parameters
•
Carrier frequency: 12.6 GHz
•
Detector/discr input frequency: 12.6 GHz
•
VCO Tuning constant: 252 kHz/Volt
•
Voltage tuning range of VCO: 2.0 V
14-16 HP 70427A/HP 70428A User's Guide
softkey.
softkey.
softkey.
softkey. Press the
NEXT INSTR
softkey.
softkey. Press the
NEXT INSTR
key and the
SHIFT
DISPLAY
key to
MENU
DISPLAY
key to
MENU
softkey.
Hard Copy