Data acquisition unit for L.D. Vibrometer

[Warrk]

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.

 

[GregLocock]

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

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[Warrk]

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.

 

[Warrk]

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).