Chapter 4 Remote Interface Reference

RS-232 Interface Configuration

The multimeter holds the DTR line FALSE while output is suspended. A form of interface deadlock exists until the controller asserts the DSR line TRUE to allow the multimeter to complete the transmission.

You can break the interface deadlock by sending the <Ctrl-C> character, which clears the operation in progress and discards pending output (this is equivalent to the IEEE-488 device clear action). For the <Ctrl-C> character to be recognized reliably by the multimeter while it holds DTR FALSE, the controller must first set DSR FALSE.

In addition, you may have difficulty sending the <Ctrl-C> character if you are interrupting a query operation, in which case the multimeter hold the DTR line FALSE. This may prevent the controller from sending anything unless you first reprogram the interface to ignore DTR.

RS-232 Troubleshooting

Here are a few things to check if you are having problems communicating over the RS-232 interface. If you need additional help, refer to the documentation that came with your computer.

•Verify that the multimeter and your computer are configured for the same baud rate, parity, and number of data bits. Make sure that your computer is set up for 1 start bit and 2 stop bits (these values are fixed on the multimeter).

•Make sure to execute the SYSTem:REMote command to place the multimeter in the REMOTE mode.

•Verify that you have connected the correct interface cable and adapters. Even if the cable has the proper connectors for your system, the internal wiring may not be correct. The Agilent 34398A Cable Kit can be used to connect the multimeter to most computers or terminals.

•Verify that you have connected the interface cable to the correct serial port on your computer (COM1, COM2, etc).

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Agilent Technologies 34401A manual RS-232 Troubleshooting
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34401A specifications

Agilent Technologies 34401A is a highly reputable digital multimeter (DMM), renowned for its accuracy, versatility, and performance in a wide range of measurement applications. First introduced in the early 1990s, the 34401A has become a staple in laboratories, manufacturing environments, and educational institutions due to its robust build and comprehensive features.

One of the standout characteristics of the 34401A is its impressive accuracy, boasting a basic DC voltage accuracy of 0.0035%, making it ideal for precise measurements in electronic testing. The multimeter offers a wide range of measurement capabilities, including voltage (DC and AC), current (DC and AC), resistance, frequency, and continuity test, making it a highly versatile tool for engineers and technicians.

The 34401A utilizes a 6½-digit resolution, enabling the user to measure small changes in electrical signals with remarkable precision. With a sampling rate of up to 1000 readings per second, it can handle dynamic test requirements, providing timely results without sacrificing measurement integrity.

In terms of connectivity, the Agilent 34401A includes a GPIB (General Purpose Interface Bus) for remote operation, allowing users to automate their testing processes and integrate the multimeter easily into larger measurement systems. This feature is particularly beneficial in automated test environments, where speed and accuracy are paramount.

Additionally, the DMM incorporates advanced measurement functions, such as statistical analysis, including mean, standard deviation, and minimum/maximum readings, which provide users with valuable insights into their data. The instrument's user-friendly interface, complete with a clear digital display and intuitive controls, enhances usability and ensures that users can easily navigate its various functions.

Robust software support further extends the capabilities of the Agilent 34401A. It is compatible with a range of software tools for data logging and analysis, enabling users to efficiently document and analyze their measurements over time.

In summary, Agilent Technologies 34401A stands out in the realm of digital multimeters due to its high accuracy, extensive measurement functionalities, and user-friendly features. Whether for research and development, quality control, or educational purposes, the 34401A remains a preferred choice for professionals demanding reliable and precise measurement solutions. Its enduring legacy in the industry speaks to its performance and reliability, making it an essential tool for anyone involved in electronic testing and measurement.
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