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Performance Tests
Test 8 - Phase Noise and Spurs (RF)
c. Enter 9.6 with the numeric keypad.
d. Press the
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
2 Hz. If necessary, switch the NORMAL/REVERSE switch and turn
the pot in the other direction.
c. Press
8. Print a graph and parameter summary
On the HP 3048A controller press the
softkey.
Step 7 - Measure phase-noise at 25.8 GHz
1. Specify measurement type and frequency range
2. Enter source and interface parameters
3. Define graph of results
4. Enter spec lines
Table 14-22
Spec Lines: 25.8 GHz (Test 8)
Point
1
2
3
4
5
6
7
14-64 HP 70427A/HP 70428A User's Guide
softkey.
GHz
softkey to continue measurement.
Proceed
•
Start freq: 10 Hz
•
Carrier frequency: 25.8 GHz
•
Detector/discr input frequency: 25.8 GHz
•
VCO Tuning constant: 400 Hz/V
•
Title: HP 70428A/002, 25.8 GHz with 0.05 ppm/V tuning.
Offset Frequency
(Hz)
1
10
100
1E3
3E3
5E3
10E3
key and the
SHIFT
Hard Copy
Amplitude
(dBc/Hz)
– 27
– 57
– 77
– 105
– 108
– 110
– 117
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