Query Indicator

Header Convention. In this manual, headers are emphasized with boldface type. The proper short form is shown in upper-case letters, such as DELay.

Header Separator. If a command has more than one header, you must separate them with a colon. (VOLT:PROT

OUTPut:PROTection:CLEar)

Optional Headers. The use of some headers is optional. Optional headers are shown in brackets, such as OUTPut[:STATe] ON. However, if you combine two or more message units into a compound message, you may need to enter the optional header. This is explained under "Traversing the Command Tree."

Query Indicator

Following a header with a question mark turns it into a query (VOLT? VOLT:PROT?). If a query contains a parameter, place the query indicator at the end of the last header (VOLT:PROT? MAX).

Message Unit Separator

When two or more message units are combined into a compound message, separate the units with a semicolon

(STATus:OPERation?;QUEStionable?).

Important

You can combine message units only at the current path of the command tree (see "Traversing the

 

Command Tree").

Root Specifier

When it precedes the first header of a message unit, the colon becomes a "root specifier". This indicates that the command path is at the root or top node of the command tree. Note the difference between root specifiers and header separators in the following examples:

OUTP:PROT:DEL .1

All colons are header separators

OUTP:PROT:DEL .1

The first colon is a root specifier

OUTP:PROT:DEL .l;:VOLT 12.5

The third colon is a root specifier

Message Terminator

A terminator informs SCPI that it has reached the end of a message. Three permitted messages terminators are:

Newline (<NL>), which is ASCII decimal 10 or hex 0A.

End or identify (<END>).

Both of the above (<NL><END>).

In the examples of this manual, there is an assumed message terminator at the end of each message. If the terminator needs to be shown, it is indicated as <NL> regardless of the actual terminator character.

Traversing the Command Tree

Figure 2-2 shows a portion of the subsystem command tree (you can see the complete tree in Figure 3-2). Note the location of the ROOT node at the top of the tree. The SCPI interface is at this location when:

The power supply is powered on.

A device clear (DCL) is sent to the power supply.

The interface encounters a message terminator.

The interface encounters a root specifier.

12 Remote Programming

Page 11
Image 11
Agilent Technologies 664xA, 665xA Traversing the Command Tree, Query Indicator, Message Unit Separator, Root Specifier

668xA, 669xA, 667xA, 664xA, 665xA specifications

Agilent Technologies has long been a pioneer in the production of high-performance electronic test and measurement instruments, particularly in the field of power sources. Among its notable offerings are the Agilent 667xA, 669xA, 665xA, 664xA, and 668xA series of power supplies. These instruments are designed to provide stable, reliable power for a variety of applications, including electronic testing, industrial processes, and research laboratories.

The Agilent 667xA series is characterized by its programmability and advanced measurement functions. These power supplies support a wide range of output voltages and currents, allowing for flexible configurations that cater to different testing needs. The built-in measurement capabilities enable users to monitor the voltage, current, and power with high precision, which is essential for ensuring optimal performance in electronic applications.

The Agilent 669xA series stands out with its high-power outputs, making it suitable for demanding applications. These power supplies deliver high voltage and current levels, making them ideal for testing high-performance devices, such as power amplifiers and motor drives. Additionally, the 669xA series includes features such as overvoltage protection and complex output sequencing to enhance the safety and reliability of the testing process.

The Agilent 665xA and 664xA series focus on delivering high accuracy and excellent regulation. These models are particularly known for their low noise operation, which is critical for sensitive applications where precision is paramount. The integrated programming capabilities allow users to automate testing sequences, thus improving efficiency in research and development settings.

The 668xA series features advanced digital signal processing that enhances the precision and stability of the output. Users benefit from features like remote sensing and monitoring, allowing feedback adjustments that maintain output accuracy despite cable losses. Furthermore, the 668xA models can integrate seamlessly with various test environments thanks to their LAN, GPIB, and USB connectivity options.

Overall, the Agilent 667xA, 669xA, 665xA, 664xA, and 668xA power supplies provide a comprehensive range of solutions for diverse electronic testing needs. With their advanced features, superb measurement capabilities, and robust performance, these instruments empower engineers and researchers to conduct their work with confidence, precision, and efficiency.