Agilent Technologies HP 8642A/B Especificações Página 92

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The PLL
BW
requirement for the measurement is a function of the average
noise level of the signal sources. If the average noise level on the input
signals exceeds approximately 0.1 radians RMS outside of the Phase Lock
Loop (PLL) bandwidth, it can prevent the HP 3048A from attaining phase
lock. Figure 2-10 shows the PTR required to provide an adequate PLL BW
for given average noise levels.
.01 .1 1 10 100 IK 10K 100K 1M 10M 40M
£(f) [dBc/Hz] vs. f[Hz]
Figure 2-10. Graph Showing Peak Tuning Range Required to Provide an
Adequate Phase Lock Loop Bandwidth for Given Average Noise Levels.
Instr. Params: $N w/PLL 2-23
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