Agilent Technologies HP 8642A/B Dokumentacja Pobierz pdf (Strona 128)

100

101

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

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

1 2 ... 123 124 125 126 127 128 129 130 131 132 133 ... 452 453

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