VT1433B User's Guide

The Host Interface Library

In the example above, Mainframe A contains the Slot 0 Controller for a multiple mainframe system. Mainframe A is connected to Mainframe B with a VXI-MXI interface, Agilent/HP E1482B. To successfully manage this multiple mainframe environment, use the following guidelines.

￿Locate modules with logical addresses less than 128 in Mainframe A.

￿Locate modules with logical addresses greater than 127 in Mainframe B.

￿Locate the highest-numbered channels in Mainframe A.

￿Locate the last module in the module list specified in the call to e1432_assign_channels() in Mainframe A.

￿Locate the module that generates the group synchronization pulse in Mainframe A.

￿Locate the channels performing channel triggering in Mainframe A.

￿Locate the module with the shared sample clock in Mainframe A.

￿If a groupID is not used with the call e1432_read_data(), empty the VT1433Bs’ FIFOs in Mainframe B before Mainframe A. In other words, do not empty the FIFOs in Mainframe A unless the FIFOs in Mainframe B have been emptied. For more information about groupID see “Grouping of Channels/Modules.”

￿If more than two mainframes are needed, daisy-chain them together. Treat each mainframe after the first as a Mainframe B. See the example on the next page.

Phase Performance in Multiple Mainframe Measurements

Phase specifications are degraded by the delay that the inter-mainframe interface gives the sample clock. This delay is insignificant for many low-frequency applications because the phase error is proportional to frequency. A system with two VXI-MXI modules and a 1 meter cable, typically has a 76 nanosecond (ns) sample clock delay in Mainframe B. This corresponds to an additional

0.007 degree phase error at 256 Hz and an additional 0.55 degree phase error at 20 kHz.

A 4-meter cable adds approximately 18 ns of delay for a total of 94 ns clock delay in Mainframe B. This corresponds to an additional 0.0087 degree phase error at 256 Hz and an additional 0.68 degree phase error at 20 kHz.

The cable adds approximately 6 ns per meter of cable.

Each daisy-chained mainframe adds another increment of delay, but only for the additional cabling length.

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VXI VT1433B manual Phase Performance in Multiple Mainframe Measurements
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VT1433B specifications

The VXI VT1433B is a versatile and sophisticated instrument designed for testing and measurement applications, particularly in the realm of telecommunications and electronics. Designed with the needs of engineers in mind, it brings a comprehensive set of features and technologies that enable accurate and efficient performance.

One of the standout features of the VT1433B is its ability to function as a high-performance data acquisition system. With up to 32 input channels, users can capture a wide range of signals simultaneously. This capability is particularly beneficial for applications requiring the monitoring of multiple parameters or systems concurrently, such as in complex electronic testing scenarios.

The VT1433B utilizes advanced technology for signal processing and analysis. Equipped with high-resolution analog-to-digital converters, the unit ensures precise measurement of various signal types, including voltage, current, and frequency. This precision is critical for engineers who rely on accurate data to make informed decisions during the design and testing phases.

In addition to its measurement capabilities, the VT1433B also supports multiple communication protocols, including GPIB, USB, and LAN, allowing for easy integration into existing test systems. This flexibility enhances its usability in both laboratory settings and field operations, where different setups may be required.

The instrument also comes with a user-friendly interface, featuring a clear display and intuitive controls that simplify operation. This design consideration allows users, regardless of their experience level, to navigate the system seamlessly and access the features they need without unnecessary delays.

Moreover, the VT1433B incorporates robust software support, including various programming tools and libraries. This aspect allows for easy implementation of automated test sequences and extensive data analysis capabilities, streamlining the workflow significantly.

Another notable characteristic of the VT1433B is its reliability and durability, designed to withstand the rigors of continuous use in demanding environments. It is engineered to operate under a broad range of temperatures and conditions, making it suitable for diverse applications, from laboratory research to field testing.

In summary, the VXI VT1433B stands out as a comprehensive testing solution, characterized by its extensive input channels, high precision measurement capabilities, multi-protocol communication, user-friendly interface, and robust software support. This combination of features and technologies makes it an invaluable tool for engineers and researchers looking to optimize their testing and data acquisition processes in various fields.
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