Agilent Technologies HP 8642A/B Especificaciones Pagina 128

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Use the Current Detector Constant
Introduction
This calibration method configures the system to use the Phase Detector
Constant currently in memory. This eliminates the time spent calibrating
the Phase Detector Constant. The Phase Detector Constant in memory
is the value that was determined by the last measurement made (unless
a stored Test File has been loaded). The Phase Detector Constant value
appears in the Calibration Process display.
The Phase Detector Constant is valid for repeat measurements of similar
devices as long as the input power levels remain the same (within
±0.3 dB).
Parameter Entry Descriptions
Entering a Detector Constant
The Phase Detector Constant's value may be changed by keying in
the desired value when "Use the Current Detector Constant Method
7
'
is displayed in inverse video. The Acceptable Limits for the Phase
Detector Constant are shown on the display. (Keep in mind that absolute
measurement accuracy depends on the accuracy of the Phase Detector
Constant.)
Estimating a Detector Constant
An estimate of the Phase Detector Constant can be made directly from
the R port input power level. (Providing the power level requirements for
driving the L port of the phase detector are being met.) A power meter
or a spectrum analyzer can be used to measure the power level. Compare
the measured R port level to the following graph to determine the Phase
Detector Constant.
Calibr Process: $N w/o PLL 2-59
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