Agilent Technologies HP 8642A/B Specifikace stáhnout pdf (Strana 121)

100

101

Extending the VCO Tuning Voltage Range value as denned on the Instru-

ment Parameters display to 10V is a valid way to increase the Peak Tun-

ing Range for the measurement. The VCO source being used in this case

must be a signal generator with a calibrated DC FM Input (such as the

HP 8662A). When the tuning range has been extended, select the "Com-

pute from Expected T. Constant" calibration method for the measurement.

Refer to the "Enhanced Tuning Range" description in Instrument Param-

eters in this chapter for complete details on extending the VCO Voltage

Tuning Range.

Compute from Expected T. Constant

Selecting the Compute from Expected Tuning Constant method causes

the system to use the entered VCO Tuning Constant and Tune-port Input

Resistance that have been defined on the Instrument Parameter display.

This method requires that the entered VCO Tuning Constant is within

±5%

of the VCO's actual sensitivity. If it is not, the system will report an

Accuracy Specification Degradation after verifying the Phase Lock Loop

Suppression.

VCO Tuning Constant

—

Entered VCO Tuning Constant x

Where : R{

= VCO Tune Port Input Resistance

2-52 Calibr Process: $N w/PLL

1 2 ... 116 117 118 119 120 121 122 123 124 125 126 ... 452 453

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Agilent Technologies HP 8642A/B Specifikace Strana 121

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