Re: [ERPS] Vibration testing

[Doug Jones]

Pierce Nichols wrote:

> I'm not sure how you are going to get better than the new data
> aquisition system. IIRC, it's 20 kHz per channel, and therefore
> should record anything you can see on the scope, and most of the
> audible range.

I've run the Omega DAQ-802 at 40 kS/s on a single channel, and as much
as 64 kS/s across 8 channels, each at 8 kS/s. Oddly, though, I could only reach that peak rate on an old Windows 3.1 486 machine- when it died of old age and we replaced it with a not-quite-so-old Win95 Pentium, that best it could do was 8 x 6 kS/s. Greater OS overhead, I suppose.

For the purposes of diagnosing the high frequency problems, you can use a single channel at max speed, of course. The device includes an analog S/H, so there's no problem with the input signal changing fast enough to confuse the succesive approximation ADC, but of course at lower sampling rates you can get aliasing.

Doug

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