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AM Noise Measurement (IF AM Detector) System Control
•
Power: Same as DUT power.
•
Modulation: OFF
Adjust the calibration source power so that the voltage measured at the
output AM detector is within ± 5% of what it was with the DUT connected
to the downconverter.
1. Read the
AM DET Voltage:
2. Press the
READ AM DET
3. Press the
READ AM DET
4. Repeat from step 1 above until the reading on the
display doesn't change from one reading to the next.
5. If necessary, increment/decrement the calibration source's output power.
6. Repeat steps 1 through 4 above to read the detector's output at the new
power.
7. Repeat steps 1 through 5 above until the calibration source's detector
voltage is within ± 5% of the DUT's detector voltage.
Step 6 - Run the calibration
Modulate the calibration source as follows:
•
Type: AM
•
Depth: 10%
•
Frequency: 1 kHz
Step 7 - Proceed with the measurement
Re-connect the DUT to the downconverter's SIGNAL input and proceed
with the measurement.
Downconverter Operation
display.
softkey.
softkey again.
HP 70427A/HP 70428A User's Guide 3-37
AM Det Voltage:
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