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Source Tuning
Tuning Constant
Sensitivity
.05 ppm/V
0.05× 10
Freq
1 ppm/V
10
2 ×10
20 ppm/V
Freq
Specify a Calibration Process
•
Determining PHASE DETECTOR CONSTANT: Measure the Detector
Constant.
•
Determining VCO TUNING CONSTANT: Measure the VCO Tuning
Constant.
•
PLL suppression: The computed PLL suppression WILL be verified.
Specify the Control of Signal Sources
•
DUT: USER'S SOURCE, MANUAL CONTROL
•
REF SOURCE: USER'S SOURCE, MANUAL CONTROL
Step 8 - Start a new measurement
Connect the sources when the software pauses at the connection diagram.
Step 9 - Verify beatnote and proceed
Adjust the HP 8662/3A's frequency, if necessary, to get a beatnote less than
5% of the peak tune range (VCO Tuning Constant × Voltage Tuning Range
of VCO).
After the beatnote is within the limits the system asks for, proceed with the
measurement.
Tunable Source Operation
Phase Noise Measurement With PLL
Tuning Range
-6
x Carrier
0.2 V
–6
× Carrier Freq
5V
–5
× Carrier
5V
HP 70427A/HP 70428A User's Guide 5-7
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