Programming Fundamentals

Improving the Speed of Your Measurements

Improving the Speed of Your Measurements

There are a number of things you can do in your programs to make them run faster:

“Turn off the display updates.” on page 67.

“Use binary data format instead of ASCII.” on page 67.

“Minimize the number of GPIB transactions.” on page 68.

“Avoid unnecessary use of *RST.” on page 70.

“Minimize DUT/instrument setup changes.” on page 70.

“Consider using LAN instead of GPIB.” on page 70.

“Avoid automatic attenuator setting.” on page 70.

“Optimize your GSM output RF spectrum switching measurement.” on page 71.

“Avoid using RFBurst trigger for single burst signals.” on page 71.

“When making power measurements on multiple bursts or slots, use CALCulate:DATA[n]:COMPress?” on page 72.

Turn off the display updates.

:DISPlay:ENABle OFF turns off the display. That is, the data may still be visible, but it will no longer be updated. Updating the display slows down the measurement. For remote testing, since the computer is processing the data rather than a person, there is no need to display the data on the analyzer screen.

Use binary data format instead of ASCII.

The ASCII data format is the instrument default since it is easier for people to understand and is required by SCPI for *RST. However, data input/output is faster using the binary formats.

:FORMat:DATA REAL,64 selects the 64-bit binary data format for all your numerical data queries. You may need to swap the byte order if you are using a PC rather than UNIX. NORMal is the default byte order. Use :FORMat:BORDer SWAP to change the byte order so that the least significant byte is sent first. (Real,32 which is smaller and somewhat faster, should only be used if you don’t need full resolution for your data. You probably need full resolution if you have frequency data.)

When using the binary format, data is sent in a block of bytes with an ASCII header. A data query would return the block of data in the following format: #DNNN<nnn binary data bytes>

Chapter 2

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Agilent Technologies E4406A VSA manual Improving the Speed of Your Measurements, Turn off the display updates
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E4406A VSA specifications

The Agilent Technologies E4406A Vector Signal Analyzer (VSA) is a sophisticated instrument designed for the analysis of complex signals. This versatile device is widely used in various fields, including telecommunications, broadcasting, and aerospace, thanks to its high-performance capabilities and advanced features.

One of the standout characteristics of the E4406A is its ability to analyze digital modulation schemes. It supports a wide range of formats, including 2G, 3G, 4G, and emerging standards, providing a comprehensive tool for engineers and researchers working with modern communication systems. The VSA is particularly valued for its flexibility in signal analysis, allowing users to capture and demodulate signals in real-time.

The E4406A utilizes advanced measurement technologies that ensure precise signal analysis. With a frequency range from 50 kHz to 6 GHz, the VSA can handle various applications, making it a suitable choice for both R&D and production testing. The instrument employs digital signal processing techniques, enabling high-resolution measurements and exceptional dynamic range. This ensures accurate interpretation of signals, even in the presence of noise or interference.

Another significant feature of the E4406A is its user-friendly interface. The combination of a graphical display and intuitive controls allows users to visualize complex waveforms and spectra easily. The software capabilities of the E4406A further enhance its usability, providing various analysis options including error vector magnitude (EVM), adjacent channel power (ACP), and spectrum occupancy. These tools allow engineers to diagnose issues rapidly and efficiently optimize their designs.

The modularity of the E4406A is a key aspect of its design. Users can upgrade their instrument with various option packs and software for specific applications, making it adaptable to a variety of testing scenarios. This flexibility ensures that the VSA remains relevant as technology evolves and new standards emerge.

In conclusion, the Agilent E4406A Vector Signal Analyzer stands out due to its combination of advanced measurement capabilities, user-friendly interface, and adaptability. Its extensive feature set makes it an essential tool for professionals involved in the development and testing of modern communication systems. Whether for research, design validation, or quality control, the E4406A delivers high-performance signal analysis that meets the demands of today's fast-paced technology landscape.
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