Agilent Technologies HP 8642A/B Specifiche Scaricare il pdf (Pagina 118)

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101

The sensitivity of the HP 11848A front panel meter depends on the gain

and attenuation settings within the phase lock circuitry. When the system

is phase locked, 0 V (center scale) on the meter indicates that the sources

are tuned to exactly the same frequency. The HP 3048A detects an out of

lock indication when the meter moves off zero more than ±2.5 divisions.

The full scale meter voltage is determined from the sum of the Center

Voltage of the VCO Tuning Curve (CV) and the Voltage Tuning Range of

VCO (VTR) entered in the Instr Parameter Menu and the configuration of

the HP 11848A's internal attenuator. The following table shows the four

full scale meter voltages possible.

Full Scale

Meter

Voltage

Center Voltage (CV)

Voltage Tuning

Range (VTR)

0.2V < CV +VTR < 1.2V

1.2V < CV + VTR < 2.4V

2.4V < CV + VTR < 6V

6V < CV +VTR < 12V

Spurs on the input signals to the phase detector must be less than

-26 dBc at offsets greater than the PLL BW. At offsets within the PtX

BW, spurs may increase at 20 dB per decade starting at —26 dBc at the

PLL BW.

Harmonics on the input signals to the phase detector must be less than

— 20 dBc or harmonics of a square wave.

Odd harmonics on the beatnote out of the phase detector must be less

than —10 dBc and even harmonics must be less than —30 dBc.

Source Return Loss less than 9.5 dB (2:1 SWR) may degrade the

performance of the HP 3048A system.

Calibr Process: $N w/PLL 2-49

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Agilent Technologies HP 8642A/B Specifiche Pagina 118

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