Sorry for mismatch signal WAS antialiased by soundbook.
Finally I've decided to use Creative EMU 1616M sound card (192kHz/24bit) instead of dedicated data aqusition unit. Polytec specialists recommend such solution for digital vibrometers (OFV-2500 is digital).
Never tried it before...
Frequency spectrum is only needed to monitor tests, so it doesn't have to be saved during measurement(timing problems can be eliminated by usage of 3 HDD's 1-system+soft,2-acqured data,3(optional)-FFT results). As You mentioned multi (4)CPU PC is reqiured for this purpose (already got it).
Best...
At the moment I'm using postprocesing soft that calculates 131072 frequency lines every 1,5 sec for spectrum 0-51,2kHz. Unfotunately it can't be used live during measurement.
In this case do You Gentlemen know soft that can record data AND calculate live at least 25k lines for spectrum 0-40kHz ...
Peak voltage is 12 V, signal is not antialiased and i HAVE too analyse whole frequency spectrum.
What i really need is unit that collects data and allows live observation of: amplitude and phase difference variations to stop test at early stage of failure. I mean that perfect unit should not...
Does anybody know what software to analyse output of dual channel Laser Doppler Vibrometer measurement(details of setup: http://www.eng-tips.com/viewthread.cfm?qid=176437&page=1).
Requirements:
determination of PEAK velocity values(not RMS) and its variations live during measurement...
Does anybody know what d.a. unit can be used to acquire data from fatigue tests(freq 20kHz).
Setup: dual LDV measurement (polytec ofv-2500).
requirements as follow
min freq range- 0-40 kHz (0-80kHz prefered)
min sampling rate- 96 kHz (192 kHz or higher prefered)
min dynamics- 16...
