Recording Data using Level Crossing?

[work3r]

I am looking for input on the most eligant way to record data per level incriments.

For example, if some external pressure source builds pressure in a cylinder, that cyliner is monitored using a voltage type pressure transducer,  the said pressure data is what I'm interested in recording using level crossing.

I do not wat a timed based sampling rate but rather use a method that logs a pressure value (say every 0.5 psi) and places that information is a deliminated ASCII file, which would be independant of time

Any ideas?

Thaanks,

Mike

[tannerite]

Hi Mike,

I think it would be easist to create an algorithm on the block diagram that only logs the data based on the the thresholds you are looking for. Based on the example you spoke about, would the data that is being logged look like 0, 0.5, 1, 1.5 ,2 .. etc.? It seems like you would be "triggering" the data logger and then recording that data.

You could use the continuous sampling mode on the DAQ device and use software to check if it should record the point, possibly using a shift register. I have attached an example I just created. You should be able to replace the "simulated ramp function" with you DAQ device. This example would be useful for finding the maximum readings, if that is what you are looking for.

Regards,