Agilent Technologies 24A Podręcznik Użytkownika Pobierz pdf (Strona 350)

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7-5

Operating Concepts

Processing

The analyzer's receiver converts the R, A, and B input signals into useful measurement

information. This conversion occurs in two main steps:

• The swept high frequency input signals are translated to ﬁxed low frequency IF signals,

using analog sampling or mixing techniques. (Refer to the service guide for more details

on the theory of operation.)

• The IF signals are converted into digital data by an analog to digital converter (ADC).

From this point on, all further signal processing is performed mathematically by the

analyzer microprocessors.

The following paragraphs describe the sequence of math operations and the resulting data

arrays as the information ﬂows from the ADC to the display. They provide a good

foundation for understanding most of the response functions, and the order in which they

are performed.

Figure 7-2 is a data processing ﬂow diagram that represents the ﬂow of numerical data

from IF detection to display. The data passes through several math operations, denoted in

the ﬁgure by single line boxes. Most of these operations can be selected and controlled with

the front panel response block menus. The data, stored in arrays along the way and

denoted by double line boxes, are places in the ﬂow path where data is accessible via GPIB.

Figure 7-2 Data Processing Flow Diagram

1 2 ... 345 346 347 348 349 350 351 352 353 354 355 ... 452 453

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