Vibration control system offers 130dB dynamic range and Wi-Fi enabled PDA or iPad operation

May 30, 2012 // By Julien Happich
Crystal Instruments has introduced its Spider-81, a highly modular, distributed, scalable vibration control system with centralized DSP architecture and simple operation via PC, Wi-Fi enabled PDA or iPad.

Unlike traditional controllers that rely heavily on an external PC for real-time operation, Spider-81 is the first controller to directly integrate time-synchronized Ethernet connectivity with an embedded DSP centralized architecture. Its patented dual A/D design makes Spider-81 the industry's first vibration control system to achieve a true 130 dB input dynamic range. Each measurement channel can detect signals ranging from 6 µV to 20V, with a design that completely eliminates the need for the input range or gain settings found on traditional controllers. Spider-81 integrates an IEPE output, charge amplifier, AC/DC coupling, and Transducer Electronic Data Sheet capabilities per IEEE P1451.1 standards, facilitating its use within larger channel count applications. Its unique floating ground design significantly reduces potential EMI/ground loop interference during installation. The incorporation of safety routing allows for transducer failure detection within milliseconds, ensuring quick troubleshooting of measurement error sources. Built-in isolated digital I/O and RS-485 serial ports also allow for easy interface with other hardware. A ten-pin D-SUB connection allows for independent monitoring of analog signal on both inputs and outputs.

Spider-81 hardware includes voltage, charge, and IEPE transducer inputs, making it ideal for use with a variety of sensor types. The system’s internal flash memory stores test configuration data for control of up to hundreds of channels simultaneously with real-time analysis and recording. A bright LCD display allows for real-time data testing status, such as control RMS or sweeping frequency, to be instantly viewed. An internal battery backup system allows for continued controller functionality and data saving, in the event of a network or power loss, ensuring fail-safe operation.

The Spider-81 is built on IEEE 1588 time synchronization technology, allowing modules on the same network to be synchronized with up to 100 ns accuracy, for a guaranteed ±1° cross-channel phase match of up to 20 kHz. With such unique technology and high-speed Ethernet data transfer, network distributed components truly act as a single, integrated system. One