Agilent Technologies HP 8642A/B Specifiche Pagina 203

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K_VCO Method: This is the calibration method selected for determining
the VCO Tuning Constant. If "Measure the VCO Tuning Constant" is
selected, the Tuning Constant of the VCO is accurately measured by the
system. If the Tuning Constant is not measured, then it is recommended
that either the PLL Suppression is verified, the VCO is a calibrated source,
or that the Tuning Constant has been verified in a previous measurement.
Tune port Resist: This is the Tune Port Resistance as defined in the
Instrument Parameter display. The exact Tune Port Resistance is not critical
when the system is instructed to measure the VCO Tuning Constant.
The Tune Port Resistance is typically 1E+6 when the Tuning Constant
is measured. Any correction for the resistance is automatically included in
the measurement.
The HP 11848A Tune Voltage Output port has a 500 internal resistance.
The tune voltage output is divided between the 50H internal resistor
and the input resistance of the Tune Port of the VCO. If the selected
VCO Tuning Constant calibration method is Compute from Expected T.
Constant, the Tune Port Resistance must be accurately defined to correctly
calculate the tune voltage output.
VCO Tune Constant: This is the VCO Tuning Constant the system used
for the measurement. The accuracy of the Tuning Constant determines
the accuracy of the PLL noise measurement for offset frequencies greater
than or equal to the phase lock loop bandwidth. The accuracy of the
Tuning Constant is verified if the PLL Suppression is Verified. The Tuning
Constant times the Voltage Tune Range determines the Peak Tune Range
(PTR) value for the measurement. The PTR sets the drift tracking and
close-in noise suppression capabilities of the system.
3-8 Param Summary
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