Insufficient memory for an acquisition PXI-5620

[Valerio Nobre]

Hi, I'm doing an application I need to acquire a signal during 932ms. I'm using edge trigger on PXI-5620. The problem is that using edge trigger I must use the maximum sample rate (64MS/s), otherwise it shows error, and trying to acquire the amount of samples for 932ms at this rate my 64MB on-board is not enough. Has somebody any suggestion?
Thanks,
Valerio Nobre

[Evan R]

Hi Valerio,

The 5620 has a flexible sample rate on it, and you should be able to set the rate anywhere from 1 kS/s to 64 MS/s.

What is the error message you are receiving when you try to change the sample rate? Perhaps if we can discover the cause of this error message, then we can set the sample rate to an appropriate level for your application.

Best Regards,

Evan R
Applications Engineer
National Instruments
http://www.ni.com/support

[Valerio Nobre]

Hi, thanks for reply. The message error it shows when I set sample rate to 63MS/s, for example, is:
"Error occurred at:
niScope Configure Trigger Edge.vi Driver Status: (0xBFFA0010)
Invalid value for parameter or property.

Analog triggering is only supported at full rate for this device.
"
If a set to 64MS/s and acquire for a small time it works.
Thanks,

Valerio Nobre

[Evan R]

Hi Valerio,

You are correct, for any type of analog triggering, the 5620 must collect at the maximum sample rate of 64 MS/s.

I believe you should be able to stream this information to an array in PC memory, (continuous acquisition). In this configuration, you would only be limited to the amount of memory on your PC.

I recommend looking at the niScope EX Fetch Forever.vi example which ships with the latest version of NI-SCOPE. You can find this example by navigating the example finder in LabVIEW (Help >> Find Examples). Browse for "Hardware Input and Output", then look for "Modular Instruments", and look for "NI-SCOPE" and finally, "niScope EX Fetch Forever.vi".

Best Regards,

Evan R.
Applications Engineer
National Instruments
http://www.ni.com/support