HP 70427A User Manual page 557

Performance Tests
Test 6 - Phase Noise and Spurs of Downconverter
If necessary, make the other module active by pressing the DISPLAY key
followed by the NEXT INSTR softkey. Press the MENU key to display the
module's softkeys.
5. Set the reference source output frequency to 9.6 GHz
a. Press the
Output
b. Press the
FREQ
c. Enter 9.6 with the numeric keypad.
d. Press the softkey.
GHz
e. If necessary, make the DUT module active by pressing the
key followed by the
display the module's softkeys.
6. Set the DUT input frequency to 9.6 GHz
a. Press the
Freqs
b. Press the
INPUT FREQ
c. Enter 9.6 with the numeric keypad.
d. Press the softkey.
GHz
7. Run the phase-noise measurement
When the phase-noise measurement program stops to prompt a zero-beat
adjustment, do the following:
a. Make sure the HP 70428A Option K01 is turned ON.
b. Adjust the pot on the HP 70428A Option K01 for a zero beat within
19 kHz. If necessary, switch the NORMAL/REVERSE switch and
turn the pot in the other direction.
c. Press softkey to continue measurement.
Proceed
8. Print a graph and parameter summary
On the HP 3048A controller press the
softkey.
Step 6 - Measure Downconverter phase noise at 25.8
1. Enter source and interface parameters
•
Carrier frequency: 28.5 GHz
•
VCO Tuning constant: 500 kHz/Volt
•
Voltage tuning range of VCO: 2.0 V
2. Define graph of results
•
Title: Downconverter at 25.8 GHz.
14-46 HP 70427A/HP 70428A User's Guide
softkey.
softkey.
softkey. Press the
NEXT INSTR
softkey.
softkey.
key and the
SHIFT
DISPLAY
key to
MENU
Hard Copy