HP 70427A User Manual page 104

Phase Noise Measurement <26.5 GHz User Control
HP 8662A/3A:EFC ................................................................................ 3Hz/v
HP 8662A/3A: ........................................................... DC FMpeak deviation
•
Center Voltage of VCO Tuning Curve:
HP 70427A: ......................................................................................... 0 V
HP 8662A/3A: ..........................................................0 V (EFC and DC FM)
•
Voltage Tuning Range of VCO:
HP 70427A: .......................................................................................±5 V
HP 8662A/3A: .......................................................±10 V (EFC and DCFM)
•
VCO Tune-port Input Resistance:
HP 70427A: ......................................................................................1 M
HP 8662A/3A:EFC ................................................................................1 M
HP 8662A: DC FM ................................................................................. 1 k
HP 8663A: DC FM ............................................................................... 600
Phase Detector-Internal Phase Detector...............................500 to 1600 MHz
3. Specify a Calibration Process
Determining PHASE DETECTOR CONSTANT: Measure the Detector
Constant.
Determining the VCO TUNING CONSTANT: Measure the VCO
Tuning Constant (unless the HP 8662/3A is being tuned with the
DC FM, then it should be computed).
The Computed PLL Suppression WILL be verified.
4. Specify the control of Signal Sources
Downconverter: USER'S DEVICE, MANUAL CONTROL
Tune Voltage: Select the instrument that will be tuned, unless the
downconverter is being tuned. If the downconverter is being tuned,
select one of the sources. With phase noise using a phase-lock-loop
selected as the measurement type, the software requires that something
be designated as the tuned device, but the downconverter is not one of
the choices. This only affects the connection diagram and does not
change the measurement of the results.
Step 7 - Start a new Measurement
Connect the sources when the software pauses at the connection diagram. set
the reference source output as follows:
Frequency ..................................................Same as downconverter's IF
Downconverter Operation
HP 70427A/HP 70428A User's Guide 3-5
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