Duration of the individual sample - OR-6220 and NOR-6723

Hello

We are acquiring data through NOR-6220 and NOR-6723 Renault in our laboratory. The data acquisition process through Data Acquisition Toolbox of Matlab, where we put the sampling rate of the analog inputs to 10 kHz - or 0.1 sec per sample. Now, we wonder what is the time of the sampling process, i.e. the period during which an individual sample. Is there an average process for the duration of the sample (0.1 s), or during a window much shorter? In the latter case, how would know us the exact duration, and it would be possible to control it?

In our case, we see resistance jumps in our system. Even if we get a range of resistances, we suspect that these jumps can actually be between two distinct levels; It is possible that the process of averaging during the sampling results in obtaining intermediate values between these resistances. Have a shorter window of sampling would be useful in addition to interpreting the results.

It seems that this could be a trivial question, or who might be a Matlab thing rather than a thing of the card. Bear with us in these cases; We have made an effort to research on the problems on the forums and elsewhere . Thank you!

There is a sample circuit and hold on the device.  The clock to convert marks the beginning of the sample interval, while the complete signal of cale HAVE mark the end.

I don't know if the waiting time is nowhere specified, but you should be able to measure like this (example LabVIEW... I don't have MATLAB or the Data Acquisition Toolbox unfortunately):

On my PCIe-6351, I get a waiting time between 440 and 450 ns.  The 6220 can be different, but I hope that gives you an estimate.  This setting is not adjustable.

Having said all that I don't think it's relevant to your question.  If your input signal varies between different levels and you want to try that once it has established a new value, you must ensure that the task of IT is synchronized to what generates the signal.

Best regards

Tags: NI Hardware

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