IEEE-488 Option -05 7

Introduction

7-1. Introduction

The IEEE-488 Interface turns the Data Acquisition Unit 2620A into a fully programmable instrument for use with the IEEE Standard 488.1 (1987) interface bus (IEEE-488 bus). With the IEEE-488 Interface, the instrument can become part of an automated instrumentation system.

The IEEE-488 Interface cannot be used with the Hydra Data Logger (2625A).

7-2. Theory of Operation

7-3. Functional Block Description

The IEEE-488 Assembly (A5) requires power supply voltages, address, data and control signals from the instrument Main Assembly (A1) to operate. The A5 assembly implements the circuitry necessary to satisfy the IEEE-488.1 standard for programmable instrumentation.

7-4. IEEE-488 PCA Detailed Circuit Description (2620A Only)

The IEEE-488 PCA comprises the following functional blocks: the Main PCA Connector, the IEEE-488 Controller, and the IEEE-488 Transceivers and Connector. These three blocks are described in the following paragraphs. Refer to Section 8 for a schematic diagram of the IEEE-488 PCA.

Pin numbering for the IEEE Controller (A5U1) differs somewhat on early production units. All A5U1 pin references in this section relate to newer production units. Differences for early production units can be identified by referencing the manufacturer’s number on the A5U1 chip with the information provided in Table 7-1.

Table 7-1. A5U1 Pin Differences

WD9914 (Early Production A5U1)

TMS9914A (Newer Production A5U1)

REFERENCE

A5U1-1

A5U1-2

A5U1-3

A5U1-4

A5U1-5

A5U1-6

A5U1-17

A5U1-19

A5U1-20

A5U1-21

A5U1-22

A5U1-23

A5U1-24

A5U1-25

A5U1-26

A5U1-27

A5U1-28

NAME

ACCRQ*

ACCGR*

CE*

WE*

DBIN (nc) (nc) D1 D0 CLK RESET* VSS TE REN IFC NDAC NRFD

NAME

(nc)

ACCRQ*

ACCGR*

CD*

WE*

DBIN D1 D0 CLK RESET* VSS TE REM IFC NDAC NRFD (nc)

REFERENCE

A5U1-1

A5U1-2

A5U1-3

A5U1-4

A5U1-5

A5U1-6

A5U1-17

A5U1-19

A5U1-20

A5U1-21

A5U1-22

A5U1-23

A5U1-24

A5U1-25

A5U1-26

A5U1-27

A5U1-28

7-3

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Fluke 2625A, 2635A Theory of Operation, IEEE-488 PCA Detailed Circuit Description 2620A Only, Functional Block Description
Page 274 Page 276

2635A, 2625A specifications

The Fluke 2625A is a sophisticated data logger designed for a wide range of industrial and laboratory applications. This versatile instrument excels in capturing and monitoring temperature and voltage measurements with precision and reliability. One of its standout features is its ability to record data from various sensors, making it ideal for environments where comprehensive data acquisition is critical.

Equipped with a large LCD display, the Fluke 2625A provides clear and user-friendly access to real-time measurement data. Its graphical interface allows users to visualize trends and monitor readings easily, which significantly enhances usability. The device supports a variety of input types and can connect to thermocouples, RTDs, and other sensors, offering great flexibility for various measurement tasks.

The Fluke 2625A employs advanced measurement technologies that ensure accuracy in data logging. With a high sampling rate, it captures fast-changing signals while maintaining data integrity. The device features a built-in memory that allows for extensive logging, accommodating long-term monitoring tasks without requiring constant oversight. Users can set it to log data at specified intervals, offering customizable solutions for different monitoring needs.

Another significant characteristic of the Fluke 2625A is its robust communication capabilities. The device supports USB and RS-232 interfaces for easy connectivity with computers and other devices, making data transfer and analysis seamless. This feature is especially beneficial for users who need to compile or analyze large sets of data quickly.

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In summary, the Fluke 2625A is a powerful data logger that combines versatility, accuracy, and reliability. Its user-friendly interface, advanced measurement technologies, and robust design make it an essential tool for professionals in various industries, from manufacturing and HVAC to research and development. Whether monitoring temperature changes in a laboratory or assessing voltage levels in an industrial setting, the Fluke 2625A stands out as a trusted solution for effective data logging and analysis.
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