VT1433B User's Guide

The Host Interface Library

Host Interrupt Handling

When the VT1433B asserts the VME interrupt line, SICL will cause the specified interrupt handler to get called. Typically the interrupt handler routine will read data from the module and then re-enable VT1433B interrupts with

e1432_reenable_interrupt. The call to e1432_reenable_interrupt must be done unless the host is not interested in any more interrupts.

Inside the interrupt handler, almost any VT1432A Host Interface library function can be called. This works because the Host Interface library disables interrupts around critical sections of code, ensuring that communication with the VT1433B module stays consistent. Things that are not valid in the handler are:

￿Calling e1432_delete_channel_group to delete a group that is simultaneously being used by non-interrupt-handler code.

￿Calling one of the read data functions (e1432_read_raw_data,

e1432_read_float32_data or e1432_read_float64_data), if the non-interrupt-handler code is also calling one of these functions.

￿Calling e1432_assign_channel_numbers to reset the list of channels that are available to the VT1432A library.

As is always the case with interrupt handlers, it is easy to introduce bugs into a program and generally difficult to track them down. Be careful when writing this function.

Data Gating

Sometimes monitoring data from some input channels and not others is desirable. The function e1432_set_enable enables or disables data from an input channel (or group of channels). If data is enabled, then the data can be read using

e1432_block_available and e1432_read_xxx_data. If data is disabled, data from the specified channel is not made available to the host computer.

This parameter can be changed while a measurement is running, to allow the host computer to look at only some of the data being collected by the VT1433B module. While data from a channel is disabled the input module continues to collect data but it is not made available to the host computer. The host can then switch from looking at some channels to looking at others during the measurement. In contrast, the function e1432_set_active completely enables or disables a channel and can’t be changed while a measurement is running.

For order tracking measurements this function can be used to switch between receiving order tracking data ordinary time data or both.

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VXI VT1433B manual Data Gating
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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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