HP 70427A User Manual page 105

Downconverter Operation
Phase Noise Measurement <26.5 GHz User Control
Amplitude ................................................................................ +16 dBm
Step 8 - Autorange the downconverter
1. Press the
Amplitudes
2. Press the
AUTO RANGE
This will trigger a one-time autoranging of the downconverter's input
attenuator and IF gain.
Step 9 - Verify beatnote and proceed
If the reference source is under user control, adjust the frequency, if
necessary, to get a beatnote less than 5 % of the peak tune range (VCO
×
Tuning Constant Voltage Tuning Range of VCO). If the reference source is
under system control it will be tuned automatically.
After the beatnote is within the limits the system asks for, proceed with the
measurement.
3-6 HP 70427A/HP 70428A User's Guide
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