Addressing the Switch Driver

Remote Operation

Programming Syntax

Since GPIB can address multiple devices through the same interface card, the device selector passed with the program message must include not only the correct interface code, but also the correct instrument address.

Interface Select Code (Selects Interface)

Each interface card has a unique interface select code. This code is used by the controller to direct commands and communications to the proper interface. The default is typically 7 for GPIB controllers.

Instrument Address (Selects Instrument)

Each instrument on an GPIB bus must have a unique instrument address between decimal 0 and 30. The address must not be the address of the controller. (Refer to Chapter 2, “Installing the 87130A Attenuator/Switch Driver.”) The device address passed with the program message must include both the correct instrument address and the correct interface select code.

Example DEVICE SELECTOR = (Interface Select Code x 100) + (Instrument Address)

Program Message Syntax

If the instrument address for the switch driver is 9 and the interface select code is 7, when the program message is passed, the routine performs its function on the instrument at device selector 709.

For the switch driver, the instrument address is typically set to 9 at the factory. The program examples in this manual assume the switch driver is set to device address 709.

To program the switch driver over the bus, you must have an understanding of the command format and structure expected by the switch driver.

The switch driver is remotely programmed with program messages. These are composed of sequences of program message units, with each unit representing a program command or query.

A program command or query is composed of a sequence of functional elements that include separators (a blank space which is required to separate the program mnemonic from the program data), headers, program data, and terminators. These elements are sent to the switch driver over the system interface as a sequence of ASCII data messages.

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Agilent Technologies 87130A Addressing the Switch Driver, Program Message Syntax, Interface Select Code Selects Interface

87130A specifications

Agilent Technologies 87130A is a highly regarded network analyzer that has been widely adopted in the field of RF and microwave testing. Known for its versatility and precision, the 87130A is designed for evaluating components and devices in various applications, including telecommunications and electronics.

One of the main features of the 87130A is its frequency range, which spans from 300 kHz to 3 GHz. This broad spectrum allows engineers to test a wide variety of RF components, including amplifiers, filters, and antennas. The analyzer provides vector network analysis capabilities, enabling users to measure both the magnitude and phase of S-parameters, essential for characterizing components effectively.

The instrument is equipped with a powerful internal calibration capability, which ensures accurate measurements by compensating for test fixture errors and other variables. The built-in electronic calibration options further enhance measurement accuracy and repeatability, giving engineers confidence in their results.

Another notable characteristic of the 87130A is its graphical user interface, which is intuitive and user-friendly. The display provides clear visual representations of measurement data, allowing for easy interpretation and analysis. Users can access a variety of measurement functions, such as gain compression, group delay, and return loss, making it a versatile tool for multi-faceted testing.

The Agilent 87130A employs advanced measurement algorithms that improve speed and accuracy. These enhancements facilitate rapid data acquisition, which is particularly beneficial in production environments where time is critical. The analyzer also supports multiple calibration techniques, including through-reflect-match (TRM) and short-open-load (SOL), catering to diverse testing needs.

Connectivity options are abundant, with GPIB, LAN, and USB interfaces, allowing seamless integration into automated test setups. This modularity supports remote operation, making it easier to incorporate the analyzer into various testing environments.

Overall, Agilent Technologies 87130A stands out for its precision, ease of use, and flexibility in RF and microwave testing applications. Its combination of advanced features and robust performance makes it a staple in laboratories, production lines, and research settings, helping engineers and technicians achieve optimal results in their measurement endeavors.