Data acquisition unit for L.D. Vibrometer
Data acquisition unit for L.D. Vibrometer
(OP)
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 bit
I have already tested:
http://www.sinusmess.de/e/produkte/soundbook.htm
next candidate is:
http:// www.lds-gr oup.com/do cs/display _product.p hp?product _item_id=3
I would appreciate any help.
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 bit
I have already tested:
http://www.sinusmess.de/e/produkte/soundbook.htm
next candidate is:
http://
I would appreciate any help.





RE: Data acquisition unit for L.D. Vibrometer
What's the peak voltage? Is your signal antialiased? What low frequency cutoff do you want?
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Data acquisition unit for L.D. Vibrometer
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 only store signals for further analysis - that will not allow me to detect crack initiation in my chips.
I know that given signal requirements are not strict at all.
Thanks in advance.
RE: Data acquisition unit for L.D. Vibrometer
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 (vibrometer voltage range is +-10 and sound card -+0,4V) but with voltage converter should work fine.... (I hope fine).