Programming Examples

Saving ASCII Trace Data in an ASCII File

ViSession defaultRM, viVSA;

ViStatus viStatus= 0;

char sTraceInfo [256]= {0}; char sTraceBuffer[1024*100]= {0}; FILE *fTraceFile;

long lComplete= 0;

unsigned long lBytesRetrieved;

/*open session to GPIB device at address 18 */ viStatus=viOpenDefaultRM (&defaultRM);

viStatus=viOpen (defaultRM, "GPIB0::18::INSTR", VI_NULL,VI_NULL, &viVSA); /*check opening session sucess*/

if(viStatus)

{

printf("Could not open a session to GPIB device at address 18!\n"); exit(0);

}

/* Set the instrument to basic mode */ viPrintf(viVSA, "INST BASIC\n");

/* Reset device */ viPrintf(viVSA, "*RST\n");

/*set the input port to the internal 50MHz reference source*/ viPrintf(viVSA, "SENS:FEED AREF\n");

/*zoom the spectrum display*/ viPrintf(viVSA, "DISP:FORM:ZOOM1\n"); /*tune the analyzer to 50MHz*/ viPrintf(viVSA, "SENS:FREQ:CENT 50E6\n"); /*print message to the standard output*/

printf("Getting the spectrum trace in ASCII format...\nPlease wait...\n\n"); /*set the analyzer in single mode*/

viPrintf(viVSA, "INIT:CONT 0\n");

/*trigger a spectrum measurement and wait for it to complete*/ viPrintf(viVSA, "INIT:IMM;*WAI\n");

/*query the spectrum trace information*/ viPrintf(viVSA, "FETCH:SPEC1?\n"); /*save the info trace to buffer*/

viRead (viVSA,(ViBuf)sTraceInfo,256,&lBytesRetrieved);

Chapter 3

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Agilent Technologies E4406A VSA manual
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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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