Agilent Technologies HP 8642A/B Spécifications télécharger pdf (Page 116)

100

101

Measure the Detector Constant

When "Measure the Detector Constant" is selected, the HP 3048A system

automatically measures the Phase Detector Constant. Measuring the

Phase Detector Constant is the most accurate method for calibrating the

detector. The system calibrates the Phase Detector Constant by generating

a beatnote frequency at approximately 10% of the entered Peak Tuning

Range. The maximum Peak Tuning Range the system will except is

500 kHz (or 200 MHz if a supported RF Analyzer is configured in the

system).

If the beatnote is less than 1 kHz, the system measures the slope of the

zero crossings to determine the Phase Detector Constant. If the beatnote is

greater than or equal to 1 kHz, the system measures the amplitude of the

fundamental of the beatnote signal and its odd harmonics to determine

the Detector Constant.

Detector Constant^

kHz

= Slope

Bea

tnote

Detector Constant^ ^^z = H\ —

3H%

+ 5#5

—

1H-;

■ ■ ■

where H\ = Peak amplitude of fundamental of beatnote

and H

= Amplitude of harmonics of beatnote

Considerations for the Phase Detector Constant

The HP 11848A External Noise Input must be attenuated as needed to

limit the Phase Detector Constant to less than 1 V/Rad to keep from

overloading the HP 11848A. The beatnote must be DC coupled to the

input for the Phase Lock Loop to operate.

Calibr Process: $N w/PLL 2-47

1 2 ... 111 112 113 114 115 116 117 118 119 120 121 ... 452 453

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Agilent Technologies HP 8642A/B Spécifications Page 116

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