Agilent Technologies HP 8642A/B Specifiche Pagina 152

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measured and used to calculate the Discriminator Constant. This method
compensates for both the non-linearity and harmonics of the phase
detector.
Considerations for the Derive From Double Sided
Spur Method
Requires an RF Spectrum Analyzer capable of measuring the carrier
frequency and the modulation side bands or a modulation analyzer with
phase demodulation capabilities.
Requires a Phase Modulator capable of generating the calibration spurs at
the desired carrier frequency.
Evaluation of the modulated spurs are necessary to insure good accuracy.
Uneven sidebands denote amplitude modulation.
The HP 11848A's front-panel meter can be used as an aid for adjusting
normal quadrature. The meter has a full scale sensitivity of 20 mV with
a 2 mV/Div resolution. The meter reading setting must be within ±1
division of center scale for starting a measurement and must remain within
±2 divisions of the center during the measurement.
An FM rate that is greater than ^ will result in a calibration spur that is
beyond the flat region of the Discriminator frequency response.
2-84 Calibr Process: $N w/FM Discriminator
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