Operating the Meter Using the Computer Interface

5

How the Meter Processes Input

5.Verify that the meter sends the following response FLUKE, 45, nnnnnnn, n.n Dn.n

nnnnnnn is your meter’s serial number, n.n identifies the main software version, and Dn.n identifies the display software version.

If Test Fails

If the meter does not respond to the test procedure as indicated:

1.Check all cable connections.

2.If you are using the RS-232 interface, check to see that the communication parameters (e.g., baud rate, parity, etc.) on the meter and host are identical.

3.If you are using the IEEE-488, check to see that it has been properly enabled and addressed.

How the Meter Processes Input

The following paragraphs summarize how the meter processes input that is received from a host (or stand-alone terminal).

Note

In this manual "input "means a string sent to the meter from a host. "Output " means a string sent from the meter through the computer interface to the host.

Input Strings

The meter processes and executes valid "input strings" sent by the host. A valid input string is one or more syntactically correct commands followed by an "input terminator." ASCII and IEEE-488 bus codes are provided in APPENDIX B.

When the meter receives input, it stores it in a 350-byte input buffer.

Note

Input strings received over the RS-232 interface are not executed or checked for proper syntax until an input terminator is received or the input buffer becomes full.

The meter accepts alphabetic characters in either upper- or lower-case. If a command cannot be understood (i.e. the equivalent of an IEEE-488 "Command Error’,), the com- mand and the rest of the command line are ignored.

Input Terminators

An input terminator is a character or command (IEEE-488.1) sent by the host that identi- fies the end of an string.

In RS-232 applications, when the meter receives an input terminator it executes all com- mands entered since the last terminator was received on a first-in first-out basis. (In IEEE-488 applications, commands are not delayed until receipt of an input terminator, but are executed as they are received.)

As input characters are processed and executed, space is made available in the input buffer for new characters. In RS-232 applications, if a communications error (e.g., parity, framing, over-run) is detected, a device-dependent error is generated, and the input string is discarded. If the meter’s input buffer becomes full when it is used with the RS-232 interface, a device-dependent error is generated (see "Event Status and Event Status

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Fluke 45 user manual How the Meter Processes Input, If Test Fails, Input Strings, Input Terminators
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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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