Chapter 2

 

 

Functional Description

2-1

INTRODUCTION

This chapter provides brief functional descriptions of the major sub-

 

 

systems that are contained in each model of the Series 682XXB/

 

 

683XXB Synthesized Signal Generators. In addition, the operation of

 

 

the frequency synthesis, automatic level control (ALC), and RF deck

 

 

subsystems is described so that the reader may better understand the

 

 

overall operation of the instrument. Block diagrams are included to

 

 

supplement the written descriptions.

2-2

682XXB/683XXB MAJOR

The 682XXB/683XXB circuitry consists of various distinct subsystems

 

SUBSYSTEMS

that are contained on one or more printed circuit board (PCB) assem-

 

 

blies or in microwave components located on the RF deck. The follow-

 

 

ing paragraphs identify the subsystems that make up the instrument

 

 

and provide a brief description of each. Figure 2-1 (page 2-6) is an

 

 

overall block diagram of a typical 682XXB/683XXB.

 

 

 

NOTE

 

 

Identical model numbers of the series 682XXB signal gen-

 

 

erator and series 683XXB signal generator contain the same

 

 

major subsystems. The only functional difference between

 

 

the two series is that the series 683XXB signal generator

 

 

has the additional capability of generating analog frequency

 

 

sweeps. This functional difference between the series is

 

 

noted in the following descriptions where applicable.

 

 

Digital

This circuit subsystem consists of the A17 CPU and

 

 

Control

A16 CPU Interface PCBs. The central processor unit

 

 

 

(CPU) is the main controller for the 682XXB/

683XXB. This controller directly or indirectly con- trols all functions of the instrument. The CPU con- tains memory that stores the main operating system components and instrument firmware, instrument calibration data, and front panel setups in the power-off condition. It has a GPIB interface that al- lows it to communicate with external devices over the GPIB and it has a serial interface to a serial ter- minal port on the rear panel. The CPU is directly linked via a dedicated data and address bus to the A2 Front Panel PCB, the A8 Function Generator PCB, the A9 PIN Control PCB, the A10 ALC PCB, the A11 FM PCB, the A12 Analog Instruction PCB, and the A16 CPU Interface PCB.

682XXB/683XXB MM

2-3

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Anritsu manual 682XXB/683XXB Major, Subsystems
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682XXB, 683XXB specifications

The Anritsu 683XXB and 682XXB series are advanced vector network analyzers (VNAs) renowned for their precision and versatility in characterizing RF and microwave components. Designed for engineers and technicians involved in the development, manufacturing, and testing of high-frequency devices, these analyzers offer state-of-the-art technology that ensures optimal performance in various applications.

One of the hallmark features of the Anritsu 683XXB and 682XXB is their high dynamic range, which allows for accurate measurements of small reflection and transmission coefficients, essential for assessing the performance of complex RF structures. With frequency coverage extending from DC to 70 GHz, these analyzers cater to a broad spectrum of applications, making them suitable for industries such as telecommunications, aerospace, and automotive.

The user-friendly interface of the Anritsu VNAs is complemented by a high-resolution display, which facilitates easy navigation through measurement setups and results. The analyzers feature multiple measurement modes, including S-parameter measurements, time-domain analysis, and noise figure measurements, providing engineers with comprehensive tools for device characterization.

Both the 683XXB and 682XXB implement advanced calibration techniques, including automated calibration and error correction methods, to enhance measurement accuracy. These methods significantly reduce the uncertainties associated with test setups, enabling reliable performance evaluations of components like filters, amplifiers, and antennas.

Anritsu’s proprietary technologies, such as the VectorStar and ShockLine series integration, further empower the 683XXB and 682XXB models. These technologies enable high-throughput testing and improved measurement stability, addressing the needs of modern production environments that demand rapid turnaround times without sacrificing precision.

Additionally, the analyzers come equipped with various connectivity options, including USB, LAN, and GPIB, ensuring seamless integration into automated test systems. This adaptability enhances the analyzers' utility in both laboratory settings and field operations.

In conclusion, the Anritsu 683XXB and 682XXB series vector network analyzers represent the pinnacle of RF and microwave testing technology. With their unmatched precision, comprehensive measurement capabilities, and advanced calibration techniques, these instruments are indispensable tools for professionals striving to push the boundaries of high-frequency device performance and reliability.
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