HP 8753E manual Data Processing Flow Diagram

Data Processing

The analyzer’s receiver converts the R, A, and B input signals into useful measurement information. This conversion occurs in two main steps:

nThe swept high frequency input signals are translated to llxed low frequency IF signals, using analog sampling or mixing techniques. (Refer to the HP 8753E Network Anuliyxer Semrice Guide for more details on the theory of operation.)

nThe IF signals are converted into digital data by an analog to digital converter (ADC). From this point on, ah 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 6-2 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 HP-IB.

A4 B--o

k 4 O-

A U X IN@-+2

A D C

D I G I T A L F I L T E R

S A M P L E R / I F C O R R E C T I O N

I

S W E E P / S W E E P

’ A”ER:GING -$ii+ COR%%N -Fi’ M

T R A C E

A T H

-

GAT I NG	E L E C T R I C A L	C O N V E R S I O N	T P A N S F O R M
( O P T 0 1 0 )			( O P T 0 1 0 )

SMOOTH, NG + F	O R M A T		--) O			F F S E T &	--)	D	I S P L A Y
		A R R A Y S				S C A L E			M E M O R Y
					M A R K E R S
				+ L I M I T T E S T I N G

D M A

+L C D

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Figure 6-2. Data Processing Flow Diagram

6 4 Application and Operation Concepts