NOTE

NOTE

Programming Fundamentals

Improving the Speed of Your Measurements

These two commands are repeated until the condition is set, so we know that the trigger is armed and ready.

•Trigger your DUT to send the burst.

•Return the measurement data to your computer.

This process cannot be done by using with the current VXI plug-n-play driver implementation. You will need to use the above SCPI commands.

When making power measurements on multiple bursts or slots, use CALCulate:DATA[n]:COMPress?

The CALC:DATA:COMP? query is the fastest way to measure power data for multiple bursts/slots. There are two reasons for this: 1. it can be used to measure data across multiple, consecutive slots/frames with just one measurement, instead of a separate measurement on each slot, and 2. it can pre-process and/or decimate the data so that you only return the information that you need which minimizes data transfer to the computer.

For example: let’s say you want to do a power measurement for a GSM base station where you generate a repeating frame with 8 different power levels. You can gather all the data with a single CALC:DATA:COMP? acquisition, using the waveform measurement.

With CALC:DATA2:COMP? MEAN,9,197,1730 you can measure the mean power in those bursts. This single command will measure the data across all 8 frames, locate the first slot/burst in each of the frames, calculate the mean power of those bursts, then return the resulting 8 values.

For later version of firmware (after A.05.00) you can use equivalent time values for the CALC:DATA:COMP? query. The command would then be CALC:DATA2:COMP? MEAN,25us,526us,579.6us,8

Let’s set up the GSM Waveform measurement:

•:CONF:WAV? turns on the waveform measurement

•:WAV:BAND 300khz sets a resolution bandwidth of 300 kHz

•:WAV:SWE:TIME 5ms sets a sweep time of 5 milliseconds

•:WAV:BAND:TYPE FLAT selects the flat filter type

•:WAV:DEC 4;DEC:STAT ON selects a decimation of 4 and turns on decimation. This reduces the amount of data that needs to be sent since the instrument hardware decimates (throws some away).

•:INIT to initiate a measurement and acquire the data

•CALC:DATA2:COMP? MEAN,25us,526us,579.6us,8 to return the desired data

72

Chapter 2

Page 71 Page 73
Page 72
Image 72
Agilent Technologies E4406A VSA manual Improving the Speed of Your Measurements
Page 71 Page 73

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.
Top Page Image Contents