Problems of acquisition & visualization: fails at 100 Hz, OK more low or more freqs

Hi all

I have some data acquisition & visualitzating problems.

The acquired data is a voltage (0 - 10V) from RDP LVDT & conditioner. My pourpose is simple: I want to gain everything by visualizing and recording to disk. I use a card BNC-2101 & 6062E. I also use LabView 8.5 on Windows XP s.p.3. I tried three ways: my own .vi and examples of LabView with internal clock and the external clock. They all consist of two steps: aquire, visualize data on a graph. and my own .vi also saves the data in a .lvm.

On the first try, I was able to acquire data with sample on request mode. But I want to get to a known frequency, so I put 1-sample (controlled HW). I set the frequency and the number of samples as well as the number of samples is of approximately 1/5 of the frequency, for a rate of graphics path 5 times / sec., BUT I found the following problems:

(1) for the acquisition in the low frequencies, say 50 Hz, there is a large gap between read data a shown in the data graphic: from 2 to 8 seconds.

(2) for the acquisition to high and very high frequencies, say 20 kHz to 100 kHz, the graphic works OK. But in this way, the file I'm writing is too much. I don't understand why when I put the computer work harder, with more data, it appears without delay.

(3) for the acquisition to 100 Hz, it does not work. An error (just know don't remember the #, is one who says this time-out has been reached whithout having given to read aviable). 99.9 Hz works, but not at 100 Hz or 200 Hz.  I really don't understand this point.

Can someone help me please?

Thank you for your attention,

usuario

Just writing to tell you that we have tried with another computer and had no problems with the hardware and the same .vi.

And have had no problem for the las 2 months.

Thank you all for your dedication.

Tags: NI Software

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