Chapter 5

Operating the Meter Using the Computer Interface

Introduction

The meter can be operated from a host (e.g., a terminal, controller, PC, or computer) by sending commands to it through a computer interface on the rear panel.

Chapter 5 describes how to set up, configure, and operate the meter via the RS-232 or (optional) IEEE-488 computer interface. With the (optional) IEEE-488 computer interface installed, the meter is fully programmable for use on the IEEE Standard 488.1 interface bus (1987). The meter is also designed in compliance with supplemental standard IEEE-488.2 (1987).

This chapter assumes you are familiar with the basics of data communication, the RS-232 interface, and the IEEE-488 bus. For an introduction to the IEEE-488 interface, request Fluke Application Bulletin AB-36, "IEEE Standard 488-1978 Digital Interface for Programmable Instrumentation."

An annotated sample program, illustrating the use of the RS-232 computer interface, is provided at the end of Chapter 5. Refer to Chapter 3 for complete descriptions of all meter functions and features. Remote calibration procedures are provided in the Fluke 45 Dual Display Multimeter Service Manual (P/N 856042).

Local and Remote Operations

When the meter is operated from a host, it is said to be operated "remotely." When the meter is operated from its front panel, it is said to be operated "locally."

Most operations that can be performed locally can also be performed remotely, over the computer interface. Some operations, like setting communications parameters for the RS-232 interface and addressing the meter for IEEE-488 operations, can only be performed from the front panel.

Computer Interfaces

The meter comes equipped with an RS-232 (serial) interface. The IEEE-488 interface is optional and is contained on a single printed circuit assembly (pca). Only one computer interface can be enabled at a time. Using either interface turns the meter into a fully pro- grammable instrument that can be integrated into an automated instrumentation system.

If you are using the RS-232 interface, continue reading. If you are using the IEEE-488 interface, skip to "Preparing Meter for Operations via IEEE-488 Interface" later in Chapter 5.

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Fluke 45 user manual Local and Remote Operations, Computer Interfaces
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45 specifications

The Fluke 45 is a versatile and high-precision Digital Multimeter that is designed for a wide range of applications in electrical testing, troubleshooting, and maintenance. Known for its reliability and advanced features, the Fluke 45 is an essential tool for engineers, technicians, and professionals who require accurate measurement capabilities.

One of the standout features of the Fluke 45 is its ability to measure both AC and DC voltage and current. With a maximum input voltage of 1000 volts and current ranges up to 10 amps, users can conduct a variety of electrical tests with confidence. The device is equipped with an intuitive dual display, allowing for simultaneous viewing of multiple measurements. This feature enhances usability during complex diagnostics.

The Fluke 45 also boasts an impressive resolution of 0.1 mV and a basic accuracy of 0.25%, which translates to highly reliable readings. The auto-ranging capability simplifies the measurement process, automatically selecting the appropriate range based on the input signal, thus saving time and reducing user error.

In addition to voltage and current measurements, the Fluke 45 features resistance measurement capabilities, with a range of up to 40 MΩ. This makes it an effective tool for testing circuits, identifying faults, and ensuring the integrity of electrical systems. The continuity test function, complete with a built-in beeper, assists in quickly diagnosing wiring issues.

Another remarkable characteristic of the Fluke 45 is its frequency measurement capabilities, which can measure frequencies up to 1 MHz. This is particularly useful in applications involving signal analysis and troubleshooting oscillators.

Moreover, the Fluke 45 is designed with user convenience in mind. It is lightweight and portable, making it easy to carry around, whether on a job site or in a workshop. The rugged construction, reinforced with high-quality materials, ensures it can withstand harsh conditions often encountered in the field.

To enhance functionality, the Fluke 45 features a data hold function that freezes the displayed measurement for easier reporting. Additionally, it can store data for later retrieval, making it convenient for users who need to compile test results over time.

In summary, the Fluke 45 Digital Multimeter is an advanced instrument that combines precision, versatility, and user-friendly design. Its wide measurement capabilities, high accuracy, and durable build make it an invaluable tool for professionals in diverse electrical and electronic applications. Whether for routine maintenance or complex troubleshooting, the Fluke 45 stands out as a reliable partner in achieving accurate and efficient results.
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