HP 70427A User Manual page 576

Offset Frequency
Point
(Hz)
8 100E3
9 1E6
10 10E6
11 40E6
12 40E6
13 10E6
14 1E3
15 100
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 the reference source frequency to 25.8 GHz
a. Press the
Output
b. Press the
FREQ
c. Enter 25.8 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.
6. Set the DUT output frequency to 25.8 GHz
a. Press the
Output
b. Press the
OUTPUT FREQ
c. Enter 25.8 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. Turn the HP 70428A Option K01 on.
b. Adjust the pot on the HP 70428A Option K01 for a zero beat within
4 Hz. If necessary, switch the NORMAL/REVERSE switch and turn
the pot in the other direction.
Test 8 - Phase Noise and Spurs (RF)
Amplitude
(dBc/Hz)
– 123
– 127
– 131
– 131
– 60
– 60
– 34
– 34
softkey.
softkey.
softkey. Press the
NEXT INSTR
softkey.
softkey.
HP 70427A/HP 70428A User's Guide 14-65
Performance Tests
DISPLAY
key to
MENU