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Kaman debuts Digital Differential Impedance Transducer

May 3, 2018 – The Measuring Division of Kaman Precision Products has released a new eddy current measurement system, the Digital Differential Impedance Transducer (DDIT). Designed to provide a digital interface for high speed eddy current measurement systems, the DDIT offers a resolution in the micro-inch range at bandwidths as high as 60 kHz.

According to the company, the DDIT is suitable for use in various applications such as magnetic bearing active control, shaft vibration, image stabilization, and adaptive optics. Using a standard 9D connector for reading data, power, and control signals, the system operates from a single power supply with a voltage range of 8-28 volts. Kaman explains its Digital DIT system samples data at eight times the data rate, saying the oversampling provides higher resolution at the defined data rate. The DDIT is available in three configurations: The Digital System is designed to interface directly to an embedded controller with a master serial peripheral interface (SPI) bus. The ANA System provides linear analogue voltage, with a full range output signal of 0-5 VDC with a null position of 2.5 VDC. The FE System is designed for field-programmable gate array (FPGA) interface for high speed operation, with data rates as high as 128 kHz, 48 bits of data, 60 kHz bandwidth, and no internal firmware.