Agilent Technologies HP 8642A/B Specifiche Scaricare il pdf (Pagina 85)

100

101

Frequency Parameter Considerations

• If the Carrier Frequency denned for the measurement is incorrect, the

Computed Output calculations may be in error. Verify that the Carrier

Frequency displayed on the Result Graph is the correct frequency.

Also,

when using an HP 11729C under system control, an incorrect

Carrier Frequency entry can result in an incorrect filter selection.

• The HP 3048A will change the Detector/Discr. Input Frequency and

update the Instrument Parameter display when a Source is under

System Control and a frequency change was required to zero the

beatnote. If the change in frequency changes other parameters such

as Peak Deviation for DC FM, the HP 3048A will inform you of the

change and allow you to proceed with the new setting or abort the

measurement.

• The system will not allow a Detector/Disc. Input Frequency of less

than 5 MHz. If you are using an external Phase Detector at a

frequency < 5MHz, enter the fundamental frequency as the carrier

frequency and 5 MHz or the Detector/Disc, frequency. (Note that

when measuring frequency < 5 MHz you must filter out the

fundamental carrier external to the HP 11848A.)

VCO Tune Port Parameters

VCO Tuning Constant is the resulting frequency deviation of the Voltage

Controlled Oscillator (VCO) for a 1 volt change at its tune port. This entry

must be accurate to within ± 5% when the HP 3048A is not going to

measure the VCO Tuning Constant. The entry must be accurate to within

a factor of 2 when the VCO Tuning Constant is going to be measured by

the HP 3048A.

2-16 Instr. Params: $N w/PLL

1 2 ... 80 81 82 83 84 85 86 87 88 89 90 ... 452 453

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Agilent Technologies HP 8642A/B Specifiche Pagina 85

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