Test procedure general flow

Can anyone recommend a general test procedure to determine the throughput of a data acquisition system.  I use a PCI-6052E on a PC with Windows XP Pro 2.8 GHz P4 2 GB of RAM.  My idea is to use a pulse generator and see when I start to lose samples, but being new to LabVIEW I am confused on how to anlyze the data and to know when this happens effectively.  Also, did the complexity of VI affect flow or is the buffer for LabVIEW big enough that this isn't a matter of concern?  To sum up, I am trying to determine the minimum and maximum of my system flow.  Any help would be greatly appreciated.  Thank you.

Hi FuzzyLipton-

You are right that the flow rate depends on the system.  Is the PCI bus bandwidth 132 MB/s theoretical, 110 MB/s typical.  It's a shared bandwidth, all other your system PCI cards will share this 110 MB/s.  With this in mind, you can determine your flow by running all your analog inputs at maximum sampling frequency.  The 6052E has a 16-bit ADC, so each sample take you is 2 bytes (16 bits X (1 byte / 8 bits)).  The maximum sampling rate is 333 Kech. / s, and there are 8 differential channels (asymmetric 16). For example, (2 bytes per sample), X (333000 samples/s) X 16 channels = 10.7 Mbps.  This should be well within the capabilities of your system (I say that without knowing your system completely).  I'm not sure how your computer might behave if it was beyond her capabilities, but I guess you would see irregular behavior.  If you are able to run this rate for a long time (several minutes) without any weird behavior of the computer, then your card cannot max on the speed of your computer.

I hope this gets you on the right foot.  Have a great day!

Tags: NI Hardware

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