HP 70427A User Manual page 539

Performance Tests
Test 3 - AM Noise and Spurs (mW LO)
2. Measure and record the DUT power
Figure 14-4 DUT Power Measure and Record
Make sure the AM detector is connected to the DUT's output, and that the
HP 3561A is connected to the detector's output via a Tee connector.
Record the DC voltage measured across the AM detector's output with the
HP 3561A as described in 1 above.
3. Set up the calibration source
14-28 HP 70427A/HP 70428A User's Guide
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Frequency: 1.2 GHz
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Power: +10 dBm
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Modulation: OFF