HP 70427A User Manual page 523

Performance Tests
Test 2 - Phase Noise and Spurs (mW LO)
The softkey is under the results graph definition menu. Use the
Spec Lines
offsets from the result table for the offset frequency and the max spec from
the result table for the amplitude. Phase noise specs are entered in order, but
the spurious specs must be entered in reverse order with an extra point at 40
MHz.
5. Set tuning sensitivity to 0.05 ppm/V
a. Do this on the reference source and the DUT.
b. Press the
Ref Chain
c. Press the
Tune Sens
d. Press the
0.05 ppm/V
e. 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 12.6 GHz
a. Press the
Output
b. Press the softkey.
FREQ
c. Enter 12.6 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. Make sure that the HP 70428A Option K01 is turned ON.
b. Adjust the pot on the HP 70428A Option K01 for a zero beat within
2 Hz. If necessary, switch the NORMAL/REVERSE switch and turn
the pot in the other direction.
c. Press to make the phase noise measurement.
Proceed
8. Print a graph and parameter summary
On the HP 3048A controller press the
14-12 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