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Data acquisition unit for L.D. Vibrometer

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-group.com/docs/display_product.php?product_item_id=3


I would appreciate any help.

RE: Data acquisition unit for L.D. Vibrometer

Doesn't sound very hard, the old HP Paragon units would handle that in their sleep, and they are 17 years or more old. Scrapped a bunch of those 4 years ago.

What's the peak voltage? Is your signal antialiased? What low frequency cutoff do you want?




Cheers

Greg Locock

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RE: Data acquisition unit for L.D. Vibrometer

(OP)
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 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

(OP)
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 (vibrometer voltage range is +-10 and sound card -+0,4V) but with voltage converter should work fine.... (I hope fine).

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