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Procedure
Performance Tests
Test 7 - AM Detector Noise Floor (AM NOISE)
The following procedure assumes familiarity with HP 3048A operation.
Initial configuration of the test system and DUT is done in steps 1 to 4.
Calibration is done in step 5, and an AM noise measurement is made in step
6.
Step 1 - Define the measurement
Specify measurement type and frequency range
•
Measurement type: AM Noise
•
Start freq: 1 Hz
•
Stop freq: 40 MHz
•
Averages: 4
Enter source and interface parameters
•
Carrier frequency: 600 MHz
•
Detector/discr input frequency: 600 MHz
•
Phase detector: External Phase/AM Detector
Specify a calibration process
•
Calibration technique: Derive from Double Sided Spur.
•
Spur Amplitude: –40 dBc
•
Spur Frequency: 1 kHz
Specify the control of signal sources
•
DUT SOURCE: USER'S SRCE, MANUAL CONTROL
•
AM DETECTOR: USER'S DEV., MANUAL CONTROL
•
CAL SOURCE: USER'S SRCE, MANUAL CONTROL
Define the graph of results
•
Title: Test 3 - Downconverter AM Detector Noise Floor
•
Minimum X coordinate: 10 Hz
•
Maximum X coordinate: 40 MHz
•
Minimum Y coordinate: –170
•
Maximum Y coordinate: 0
•
Horizontal portion of display to be used: 100%
•
Vertical portion of display to be used: 100%
•
Graph type: AM Noise (dBc/Hz)
Enter the spec lines
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.
14-52 HP 70427A/HP 70428A User's Guide
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