The board RUSB11-4 uses a powerful FPGA with built-in DSP blocks. Using the FPGA makes it possible to carry out parallel computations needed for multi-channel system. Sample frequency 3MHz is optimal in terms of memory usage and fast data transfer, and it is adequate for most industrial applications.
High-capacity memory chip (4 MBit) buffers the data stream. The waveform can be recorded on all channels simultaneously.
The same memory chip is used for automatic allocation of memory between the descriptions of the pulse and waveforms . Adaptive algorithm and large memory capacity preclude overflow of the memory buffer.
Parametric channel has true differential inputs. The inputs withstand common mode voltage ±120 V. Differential voltage is limited to 40 V. Data is sampled by 16-bit ADC.
Operating modes: switchable voltage/current input, popular current loop 4-20ma mode, for a variety of sensors.
In standard mode, the parametric data is stored at regular intervals in the range from 22ms to several min. If attached to the AE hits, the recording interval can be as low as 17 us.
Built-in oscilloscope, 3MS/s on all channels simultaneously.
Built-in pulse generator provides a sensor test and calibration in automatic and manual modes. The amplitude is digitally controlled in 0-30V range.
Digital attenuator for each channel in the range 0-18dB provides a significant additional gain in special cases. It also provides an opportunity to equalize the channels gain in case of the significant heterogeneity due to adverse acoustic contact for some sensors or the differences in the coefficients of electro-acoustic conversion at the nodes of the acoustic antenna.
10 High Pass, 10 Low Pass digital FIR 18-bit filter selections for each channel, totally under software control, extremely high slope up to 440 dB/oct, linear phase.