Agilent Technologies HP 8642A/B Specifiche Pagina 309

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Description
To configure a supported RF Source into the system, enter the Name (RF
Source), Model Number, and HP-IB Address into the System Configura-
tion Table. (If more than one RF source is needed in the system configu-
ration, enter "RF Source 1", "RF Source 2"... to identify each source.) The
Serial Number and Option Number of the RF Source may also be entered.
Under Define Measurement, configure the Source Control display block
diagram to include the specified RF Source in the Ref. Source or Source
block and press the Control softkey to enable the System Control.
For a User's Source (DUT) under system control, you must enter the
appropriate HP-IB string output statement in the System Control display.
This allows the system to set the source's frequency, output level, and
modulation (if any). Any HP-IB controlled source can be set up under
system control. (Refer to Source Control in Chapter 2, Measurement
Definitions, for further information on the HP-IB string for a Users DUT
under system control).
Verify that the Detector/Disc. Input Frequency is correctly entered in the
Instr. Param display. This entry sets the output frequency of a supported
system controlled RF Source.
Verify that the correct Instrument Parameters are entered for
RF Source that is also the VCO for a PLL measurement.
The application and the performance of the device being measured
determines the selection of the RF Source. Each of the RF Sources
supported by the HP 3048A has different qualities. For example, the
HP 8662A has better phase noise performance close to the carrier than
the HP 8642A, yet the HP 8642A has greater DC FM capabilities and a
lower noise floor at offsets greater than 20 kHz from the carrier.
RF Sources 6-5
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