Agilent Technologies HP 8642A/B Specifiche Scaricare il pdf (Pagina 113)

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Parameter Entry Descriptions

Use the Current Detector Constant

When measuring similar devices the "Use the Current Detector" method

can be used to save calibration time. The system assumes that the

frequency and amplitude are identical to the previous measurement in

which the Phase Detector Constant was established. In most cases, the

accuracy uncertainty is negligible as long as the power levels are very

close (±0.3 dB) to the levels present when the Phase Detector Constant

was established.

User entry of the Phase Detector Constant (within the range of Acceptable

Values displayed) is possible when the sensitivity of the detector being

used is known. Entering the Phase Detector Constant can be helpful when

the system is unable to measure the Phase Detector Constant. Keep in

mind that the accuracy of the measurement is dependent on the accuracy

of the Phase Detector Constant. The HP 3048A verifies the accuracy of the

entered Phase Detector Constant when it is configured to verify the Phase

Lock Loop Suppression. An Accuracy Specification Degradation will be

reported if the entered Phase Detector Constant is in error.

The sensitivity of the phase detector is a function of the input level to

the phase detector. You can estimate the Phase Detector Constant directly

from the input power level at the R port of the phase detector; providing

the input level required for driving the L port of the phase detector has

been met. A power meter or a spectrum analyzer can be used to measure

the input level at the R port. Compare the measured R port level to graph

below to estimate the Phase Detector Constant.

2-44 Calibr Process: $N w/PLL

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Agilent Technologies HP 8642A/B Specifiche Pagina 113

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