Data acquisition high speed (200 ksps / s) with pci-6224 or usb-6211 is possible?

Hello

I need assistance to complete a task.

The task:

Record a switch contacts twists every 5 microseconds (200 ksps / s).  DAQ cards I have at my disposal at the present time are PCI-6224 and the USB-6211. The two cards are rated up to 250 kech. / s. I only watch 1 channel that will monitor the voltage.

Here are the settings I use:

CSR

Continuous samples

Sampling rate of 200 kech. / s

Analog DBL1 1 sam chan

timeout of 10 seconds (Read DAQmx)

The problem:

(1) every time I try to taste 200 kech. / s I get an error that reads

Measurements: Tried to read samples that are no longer available. The requested sample was already available, but has since been replaced.

Increase in the size of buffer, most frequently the reading of data or by specifying a fixed number of samples to read instead of reading all available samples would correct the problem.

(2) when you try to taste at a much slower pace of 50 kech. / s, the speed of the loop iteration is not realizing this speed setting.

My question is this: are these 2 cards (PCI-6224 or USB-6211) DAQ fast enough at my request and I do something wrong? OR

I use the wrong hardware to accomplish my task?

Thank you in advance,

Gerardo

The number of iterations has nothing to do with the number of samples if you do it right. You specify the rate and the number of samples you want and number of samples returned. You DO NOT loop 200,000 times. If you ask for 200 000 s/s and 200,000 samples, you will get this number of samples every second. It's really as simple as that.

Tags: NI Hardware

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