Is it possible to stream 60MB to disk at a samplerate of 1MS/s using a NI5112-scope

[Roger_C]

I know you can use the 16 MB buffer on the card and stream (during acquisition) the contents of this buffer to disk. But is it possible to use this buffer as a circular buffer and stream the contents of this buffer to the RAM-memory of the host-pc. Or is the memory on the card the limit. My application requires a high sample-rate (1 MS/s) in combination with a long measure-time (at least 60 s.)

[Leonard]

Hi Buster,

NI-Scope 2.0 allows you to run the 5112 in a continuous mode and includes examples to show you how to do this. This version is posted at http://digital.ni.com/softlib.nsf/ current


We ran some benchmarks here and found that on a 333MHz PXI-8156B controller, that we could stream to disk up to 2.32 MS/s on 1 channel of the 5112. With 2 channels, we could stream to disk at 1.11 MS/s. These rates were found using LabVIEW 6.0.


We also tested a 1 GHz Pentium III desktop with MXI III to the PXI chassis and found that we could stream to disk at 12.5 MS/s on 1 channel and 5.88 MS/s on 2 channels. This was with LabVIEW 6.0.


The rates with C were faster.


So the answer to your question is yes. You should be able to run at 1 MS/s with NI-Scope 2.0.


Please k
eep in mind that this numbers are only benchmarks and that they will vary from computer to computer depending on what things are installed and running on the machine and what kind of machine it is. We are not guaranteeing that you can run at these rates but letting you know that we have achieved them on computers here.


Best Regards,
Brian