Chapter 4 Remote Interface Reference

Simplified Programming Overview

C a u t i o n

If you send two query commands without reading the response from the

 

first, and then attempt to read the second response, you may receive some

 

data from the first response followed by the complete second response.

 

To avoid this, do not send a query command without reading the

 

response. When you cannot avoid this situation, send a device clear

 

before sending the second query command.

 

 

Using the INITiate and FETCh? Commands

 

The INITiate and FETCh? commands provide the lowest level of

 

 

control (with the most flexibility) of measurement triggering and

 

 

 

 

reading retrieval. Use the INITiate command after you have

 

 

configured the multimeter for the measurement. This changes the state

 

 

of the triggering system from the “idle” state to the “wait-for-trigger”

 

 

state. Measurements will begin when the specified trigger conditions

4

 

are satisfied after the INITiate command is received. The readings are

 

placed in the multimeter’s internal memory (up to 512 readings can be

 

 

 

 

stored). Readings are stored in memory until you are able to retrieve them.

 

 

Use the FETCh? command to transfer the readings from the

 

 

multimeter’s internal memory to the multimeter’s output buffer where

 

 

you can read them into your bus controller.

 

 

 

 

MEASure?

The following program segment shows how to use the MEASure?

 

Example

command to make a measurement. This example configures the

 

 

multimeter for dc voltage measurements, automatically places the

 

 

multimeter in the “wait-for-trigger” state, internally triggers the

 

multimeter to take one reading, and then sends the reading to the output buffer.

MEAS:VOLT:DC? 10,0.003 bus enter statement

This is the simplest way to take a reading. However, you do not have any flexibility with MEASure? to set the trigger count, sample count, trigger delay, etc. All measurement parameters except function, range, and resolution are preset for you automatically (see the table on page 112).

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Agilent Technologies 34401A Using the INITiate and FETCh? Commands, Before sending the second query command, MEASure?
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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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