Agilent Technologies HP 8642A/B Especificaciones Pagina 99

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When Enhanced Tuning Range is used the system is unable to measure
the VCO Tuning Constant and you must select the "Compute from
Expected T. Constant" in the Calib. Process display, and enter the exact
VCO Tuning Constant and Tune Port Resistance in the Instrument
Parameter display. Normally the System measures the VCO Tuning
Constant by applying ± 15 and 45% of the Voltage Tuning Range
to the tune port of the VCO. Enhanced Tuning Range increases the
Voltage Tuning Range to where 45% of the Voltage Tuning Range
would drive the tune port into its non-linear region. This would create
a VCO non-linear error message and stop the measurement.
The Verification of the Phase Lock Loop Suppression is recommended
to ensure the validity of the entered VCO Tuning Constant and the
Phase Detector Constant.
The beatnote must be within 10% of the PTR to insure that the system
can measure the Phase Detector Constant. The software applies 10%
of the Voltage Tuning Range to create a beatnote to measure the Phase
Detector Constant.
2-30 Instr. Params: $N w/PLL
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