Agilent Technologies HP 8642A/B Spécifications Page 90

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.01 .1 1 10 100 !K 10K 100K 1M 10M 40M
Jl(f) [dBc/Hz] vs. f [Hz]
Figure 2-8. Noise Floor Level Limits for Various PTRs
If you maximized the PTR for your initial measurement to ensure that
the HP 3048A has adequate drift tracking capability to complete the PLL
measurement, it is recommended that you incrementally reduce the PTR
and initiate a new measurement to verify that your Measurement Results
are not being limited by the Noise Floor of the system. Continue to lower
the PTR (by reducing the Tuning Constant or Voltage Tuning Range) and
make new measurements until there is no subsequent reduction in the
measured noise floor, or until the HP 3048A is no longer able to acquire
or maintain phase lock.
Instr. Params: $N w/PLL 2-21
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