Agilent Technologies HP 8642A/B Specifiche Pagina 89

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2.
If the drift estimate is based on a period of 10 minutes to | hour, use
the drift estimate directly as the PTR required for the measurement.
If the drift estimate is short term (10 seconds to 1 minute), multiply
the drift estimate by 100 to determine the required PTR. A factor of
100 is recommended to ensure that the HP 3048A has sufficient Drift
Tracking range to complete the initial noise measurement. (Refer to
Noise Floor Level in this section for information about reducing the
PTR for subsequent measurements to verify the measurement noise
floor.)
3.
Divide the required PTR by the VCO's Tune Voltage Range to
determine the VCO Tuning Constant required for the measurement.
NOTE
The PTR can also be modified by changing the Voltage
Tuning Range of the VCO value defined for measurement.
Noise Floor Level
The noise floor available for the measurement can be limited by the
presence of noise at the VCO control port. Narrowing the PTR can reduce
the effect of the control port noise thereby reducing the measurement
noise floor. Figure 2-8 shows the noise floor limits for various PTRs.
2-20 Instr. Params: $N w/PLL
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