iDSC 1816: When you need the ultimate in signal quality
The iDSC 1816 board combines 16-bit resolution on eight simultaneous channels of data acquisition with brick-wall anti-alias filters on each channel. The iDSC 1816 samples analog inputs at a throughput of 1.2M samples per second, with the sampling rate on each channel ranging from 8 samples per second to 153.6k samples per second. The data stream optionally includes an additional 300k samples per second: information from one or two external timing channels. Software can parse the data stream to correlate the analog data with events on one or both of the timing channels, to a resolution of 51 nanoseconds.
The iDSC 1816 comes with DSCview included, and drivers for DASYLab, Agilent/HP VEE, LabVIEW, LabWindows/CVI, and MATLAB. The iDSC 1816 also includes programming support for Visual Basic, Visual C++, and other Windows programming environments through the DSCIO.DLL, a standard Windows DLL interface. It supports development environments like Delphi and C++Builder through a native DSC Component. It also supports Linux development environments like Kylix and GC++. With the DSCview software on your PC, you can customize the filter characteristics for each channel, and download them to the iDSC board. Download DSCview and check it out.
If you need signal conditioning for your iDSC 1816 system, Microstar Laboratories has the solution. Microstar Laboratories has developed an 8-channel sensor signal-conditioning system, the SCS, that complements the 8-channel iDSC 1816 board to provide a continuous path in a single package: starting with raw measurements at the sensor and ending with conditioned anti-aliased data logged to disk on a PC.
Data Acquisition, Spectral Analysis, and Aliasing
Data acquisition digitizes an analog signal by sampling it at discrete times, several times in each cycle, to produce a stream of numbers. Spectral analysis does the math on these numbers, mostly using the fast Fourier transform, that breaks out the frequency components of the signal. And aliasing – high-frequency results folded into otherwise accurate data – corrupts the results.
The iDSC 1816 removes all aliasing from data acquisition. Guaranteed. Using the latest analog and digital components and proprietary algorithms, it implements onboard brick-wall filters. And that makes spectral analysis reliable.
Microstar Laboratories has produced a unique new board for the PC. And it has applied its trademark onboard intelligence to make the board a must-have product for anyone doing serious data acquisition. The filters in the iDSC 1816 have variable cutoff frequencies – up to 61.44 kHz – and linear phase response. Each channel can have a different filter. And the board requires no user programming.
Sometimes you have to get serious about aliasing. And when you do, contact us.
The iDSC 1816 provides continuous, gap-free input, and allows a different cutoff frequency on each channel.
Software Selectable Acquisition Front End
Menu choices configure which physical inputs to sample. The iDSC 1816 provides up to 8 inputs each with its own separate software-selected filter.
The iDSC can transfer to PC memory continuously at the 1.2M samples per second required for 8 simultaneous channels sampling at its maximum rate per channel of 153.6k samples per second.
Synchronizing Several Boards
Onboard circuitry and special synchronization connectors can support several Microstar Laboratories boards, in any combination of iDSC and DAP models, running in the same PC. A master DAP provides a sampling or an update clock to software-selectable slave DAPs. A software-selectable master iDSC provides a sampling clock to software-selectable slave iDSC boards. The iDSC sampling clock signal, when applied to the external clock input of the master DAP, synchronizes both groups of boards. Each DAP then may sample up to 153.6k samples per second. Microstar Laboratories also provides for synchronization of boards installed in different PCs. Contact us for details.
Onboard fourth-order analog anti-alias filters pass signals to decimation filters in the eight Sigma-Delta A/D converters. This hardware converts signals to simultaneous filtered data at 153.6k samples per second on each channel. Configurable symmetric FIR filters implemented on two DSP chips allow any of these sampling rates:
Valid cutoff frequencies fall in the range 2% to 80% of Nyquist; in other words: 100 to 2.5 samples per cycle. So cutoff frequencies range from 61.44 kHz on down. Above 50% of Nyquist, resulting filters roll off at better than 96 dB per quarter-octave.
Timing Signal Inputs
Software can instruct the iDSC 1816 to enable either or both of the two external timing channels. The board then samples TTL signal inputs at 128 times the maximum data sampling rate to provide a resolution below 51 nanoseconds. It uses this information to time the sample on each data channel closest to an event on a timing channel. Contact Microstar Laboratories before working with this feature at data rates above 78.6k samples per second.
iDSC 1816 Specifications
¹ Benchmark rates vary with PC platform.
* All specifications are applicable from DC through the entire frequency range unless otherwise noted.
Learn about the software side of filtering with DSCview or learn about the wide range of Data Acquisition Processor boards available from Microstar Laboratories. If you need signal conditioning for your iDSC 1816 system, Microstar Laboratories has the solution.