Programming Fundamentals

SCPI Language Basics

The following are some examples of good and bad commands. The examples are created from a theoretical instrument with the simple set of commands indicated below:

[:SENSe]

:POWer

[:RF] :ATTenuation 40dB

:TRIGger

[:SEQuence] :EXTernal [1]

:SLOPe POSitive

[:SENSe]

:FREQuency

:STARt

:POWer

[:RF]

:MIXer

:RANGe

[:UPPer]

Bad Command

Good Command

 

 

PWR:ATT 40dB

POW:ATT 40dB

 

 

The short form of POWER is POW, not PWR.

 

 

 

FREQ:STAR 30MHz;MIX:RANG -20dBm

FREQ:STAR 30MHz;POW:MIX:RANG

 

-20dBm

 

 

The MIX:RANG command is in the same :SENSE subsystem as FREQ, but executing the FREQ command puts you back at the SENSE level. You must specify POW to get to the MIX:RANG command.

FREQ:STAR 30MHz;POW:MIX RANG

FREQ:STAR 30MHz;POW:MIX:RANG

-20dBm

-20dBm

 

 

MIX and RANG require a colon to separate them.

 

 

:POW:ATT 40dB;TRIG:FREQ:STAR

:POW:ATT 40dB;:FREQ:STAR

2.3GHz

2.3GHz

 

 

:FREQ:STAR is in the :SENSE subsystem, not the :TRIGGER subsystem.

 

 

:POW:ATT?:FREQ:STAR?

:POW:ATT?;:FREQ:STAR?

 

 

:POW and FREQ are within the same :SENSE subsystem, but they are two separate commands, so they should be separated with a semicolon, not a colon.

:POW:ATT -5dB;:FREQ:STAR 10MHz

:POW:ATT 5dB;:FREQ:STAR 10MHz

 

 

Attenuation cannot be a negative value.

 

66

Chapter 2

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Agilent Technologies E4406A VSA manual SENSe POWer
Page 65 Page 67

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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