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NOTE
NOTE
AM Noise Measurement (IF AM Detector) System Control
Step 1 - Define the measurement
Follow the instructions in the HP 3048A manual along with the following
information:
1. System Configuration
Enter the downconverter in the system configuration table. Refer to chapter 1
in this manual for information on determining and setting the
HP 70427A's HP-IB address.
2. Specify Measurement Type and Frequency Range
•
Measurement Type: AM Noise.
3. Enter Source and Interface Parameters
•
Carrier Frequency: DUT frequency.
•
Detector/Discr. Input Frequency: downconverter's IF frequency.
To find the IF frequency, manually enter the carrier frequency into the
HP 70427A. It will calculate and display the IF frequency.
•
Detector - HP 70427A IF AM Detector.
4. Specify a Calibration Process
•
Phase Detector Constant: Derive from Double Sided Spur
•
Spur amplitude: –26 dBc
•
Spur frequency: 1 kHz
5. Specify the Control of Signal Sources
AM Detector: 70427A, SYSTEM CONTROL
CAL source: USERS DEVICE, MANUAL CONTROL.
70427A Parms
Press the
70427A Parms
The Up/Down arrow keys select the parameters, and the Left/Right arrow
keys select the parameters value.
•
Spectrum Analyzer View: IF
•
Microwave/mm Band: select (μW) 0 - 26.5 if an external harmonic
mixer is not being used, otherwise select the mm band of the external
mixer.
•
Auto/Manual Input Attenuation & IF Gain: AUTO
softkey on the HP 70428A controller.
HP 70427A/HP 70428A User's Guide 3-35
Downconverter Operation
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