Verify my maximum achievable sample rate .

I am using a PXI 6031E and an SCXI 1001 Chassis populated with six 1102c modules. I am setup to multiplex 192 channels to one DAQ channel(0). I am using every channel on every module. The 1102c is cable of 333KS/sec but using all 32 channels my max should be a little more than 10Khz. My PXI 6031E is capable of 100KS/sec but now I am limited by the module speed so the best I can get is around 10Khz. Is this correct?

I have a problem that's kinda similar.
We are using a PXI 6031E in a PXI 1036 housing connected to a computer with a PXI 8360 MXI card.
I was trying to measure 17 Channels at 10k, but it just didn't work. According to the Datasheet, the max. sample rate of the 6031E is 100kHz.
Then I figured, that maybe the whole sum of all used channels may be 100kHz.
The maximum samplerate that works is 7262 Hz.
But 7262 * 17 is about 123 000, which is more then 100 000.
Could someone could explain, whats behind that?
Attachments:
highsamplerate.PNG ‏24 KB

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DDS Compiler (Xilinx Coregen IP) maximum achievable clock rate

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I am using labview FPGA2011 and FlexRIO 7965R (i.e. Virtex5 SX95T). I have compiled a sinusoid generater using the built in Xilinx Coregen IP named 'DDS Compiler'. The output of DDS Compiler is sent to the host VI using DMA FIFO. My SCTL runs at 346MHz, as the largest clock that can be provided is 346.666MHz. The code according to DDS Compiler data sheet (DS558) with the configuration settings that i have used, should burn at 450MHz (mentioned in cloumn 4 of Table8 on page 28). But my code gives a maximum achievable clock rate of 350.63MHz. I have attached my code and images of the compilation results. Can somebody check and tell me why am i not getting the 450MHz rate? Is there any limitation on the clock rate due to the VI scoped or DMA FIFOs?
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Attachments:
DDS Compiler.zip ‏858 KB
images.zip ‏53 KB

Hi Sandee,
What are you planning on doing with this sine wave? Are you using a FlexRIO Adapater Module(FAM)?
The reason you can't get anything higher than 346.66MHz is because the clock that is being generated from is a 40 MHz clock. Once you multiply it up that high, the accuracy of the frequency is not reliable.
The beauty of the FlexRIO is that you are able to bring in external clocks with several of our FAMs. These external clocks are piped directly to the FPGA. On top of that, if you're using the 6587 FAM, for example, you're able to generate up to a 500 MHz clock on the FAM, and provide that to the FPGA.
To do that, you first add your adapter module to the project
Right click on your fpga target -> select new FPGA Base clock - > IO Module clock 0 from the drop down.
Then specify your frequency to be 450 or 500, whatever you want it to be.
Then on your block diagram, you'll provide your single cycle timed loop with the IO Module Clock 0 as the source.
I'm going to compile it now and I'll update with the results.
National Instruments
FlexRIO & R-Series Product Support Engineer

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If I import recordings as AIFFs or WAVs to iTunes it shows the recording parameters in iTunes, but my old Yamaha processor which accepts PCM doesn't show the source data values, though I know it can handle 96kHz 24bit from DVD audio.
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Thank you, that article was helpful, but it did not say what bitrates could be used with AAC. MP3 is from 32 Kbps to 320 Kbps, can I use 320 Kbps for AAC too? What about sample sizes for WAV and AIFF?

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This is my first post to this form
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GB Ram
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-cmsleimanMessage Edited by cmsleiman on -27-2004 09:38 PM

Well, I am new to high-end sound cards, and I may be misinterpreting the terminology, but the sound card is supposed to be a 24bit/96kHz card.
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this does not mean that you cannot change it while the VI is running.
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continuous, this would have the same effect as stopping the vi, i asume.
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this is e.g. often used for acquistion on rotating shafts. the
acquistionrate is always e.g. 24 points per revolution regardless of
the rotational speed of the shaft, except for a maximum frequency of
course.
Norbert B.
NI - Germany
Message Edited by Norbert B on 09-14-2005 04:16 AM
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Well, I am new to high-end sound cards, and I may be misinterpreting the terminology, but the sound card is supposed to be a 24bit/96kHz card.
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Hello Shan405,
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