Agilent Technologies HP 8642A/B Specifiche Scaricare il pdf (Pagina 271)

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Description

The Default Table Values

The default FFT Segment Table provides an optimum set of values for

most noise measurements. The default Segment Table values should be

used the first time a new measurement is made. This guarantees that any

measurement problems are not due to the defined segment table.

Storing the Table

Segment Table data is stored whenever a Test File is created. When a Test

File is loaded, the Segment Table data is set to the values stored in the

Test File.

Modifying the Table

Changes made to the Segment Table do not affect measurement accuracy,

but changes can cause gaps in the Results Graph if the segments do not

cover a continuous frequency range. Also, changes can result in longer

then necessary measurement periods.

Any time the Segment Table is changed and Repeat Msrmnt is selected the

entire frequency offset range of interest should be remeasured, as existing

segment data may be overwritten by new data.

Considerations for Modifying the Segment Table

There is a basic trade-off between the resolution of a measurement and

the time the measurement takes. To increase measurement resolution, fre-

quency, or amplitude, you must be willing to accept longer measurement

times.

It may be possible, however, to minimize the increase in measure-

ment time and still get the increased measurement resolution you need

over a specific portion of the graph by decreasing the resolution for other

portions of the graph.

5-14 FFT Segmnts

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Agilent Technologies HP 8642A/B Specifiche Pagina 271

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