6259 analog integrated Output error with the sample clock

I run into some problems outputing a sinusoid of analog output with my acquisition of data using the sampleclock aboard. At one point, I was able to get the vi works pretty good and repeatable. When revisited however, I started to see error that the driver could not provide the unit with the points quickly. I was running at 250 k 1 k sampling rate a tone to one, but it seems only to be able to get about 20 k, sampling frequency. This creates a pretty rough signal, expecially when the rate fell to 8 k. I produce only 1 second of data.

See attached bmp. The I/O moved references aren't channels of tasks. Could be the problem? I'm a little frustrated because he has to be a very simple to create vi and I'm having all sorts of problems with it.

Hi klessm1,

I want to stress that the behavior you're seeing is atypical - under normal circumstances, DMA transfers must take place fast enough to keep the data in the FIFO embedded permanently until at least the max (2.86 MHz single channel) sampling rate. After saying that the error you receive indicates that we get no data for the 6259 fast enough for some reason - there are a few options at this point, it should get you operational:

Remove the need to transfer data to the device. As Sarah suggested, you can do so by regenerating the on-board FIFO. The FIFO output on the 6259 is 8 191 samples (shared between the channels), so if you build a periodic signal and this is a sufficient number of samples to characterize a period then this should be a viable option.

Try using interrupts instead of DMA. This may seem paradoxical since DMA is generally the fastest method of data transfer on our DAQ hardware, but something rings the Bell with the DMA transfer from your computer to the 6259. I imagine that you will actually have a faster rate using interrupts if that is the case.

You can configure the appliance to use only the quantity of memory onboard or interruptions using a channel property node DAQmx (Analog Output > General Properties > advanced > memory and data transfer)

Implement a delay between the start of the task and the first sample. If the problem is with the first DMA transfer latency (and not the total throughput on the PCI bus), then adding a delay before attempting to write the first sample should solve the problem. Some motherboards have been found to have a latency higher than the others (so the question of Sarah #3).

You can configure the delay with the property node Trigger DAQmx (start > more > Delay / delay units). This applies even if you do not explicitly have a configured start trigger.

I think the three above are good ideas to try depending on what you need exactly. I would also check for updates to the BIOS available for your motherboard that could address the issue (but it would be something that the manufacturer would be more known). I hope this help - made - know us how it goes!

-John

Tags: NI Hardware

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Hello world

After 10 years of LabVIEW experience I'm totally lost.

It's my first project with DAQmx and I do not know how to handle.

My configuration: Windows7. LabVIEW 2012 DevSuite; X Series USB-6366

My goal: trigger value encoder and 2 inputs analog

I would get a result for the value of the encoder and each of the two analog inputs for each change of the value of the encoder (not more! I do not want to sort a huge amount of data afterwards)

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I have attached the confiuration exported from the measurement and Automation Explorer.

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Balze

P.S.: Sorry I got COMPRESS the *.nce file, because NEITHER allows you to attach files *.nce

You'll get there, but yes, the first exhibition to DAQmx is probably a little overwhelming. A few other tips based on your screenshot (I'm on LV2010 & can't open the code).

1. "allow buffer overwrites" is that a functional but description is not text. It lies under the Read DAQmx property node and must be configured before starting the task. Here is an excerpt:

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(It is possible to specify just several channels in a single call, but separate calls gives you the ability to configure different setting on the scale or range of entry).

3. the 'random', which IA task gave you the error is due to the lack of sequencing in your attempts to start tasks. The question which is the fortunate success that happens to run first can (and does) vary from run to run. By combining the two channels to HAVE in a single task, this problem will disappear, but you want to be sure that the tasks of the AI and the counter are started * before * any clock signals come to PFI8.

4. "change detection" will be available for digital input assignments, not tasks of meter. And it is also generally supported only for a digital port a-bit value. Other ports then that support data acq clocked by the software on demand. I guess one of these questions is the source of your error.

On the boards of the M series that I used, change detection has been supported only on port 0 - I think that the same thing will be true for the X-series cards. The following took place without error for me using a simulated X series device. By selecting another port gave an error.

Buffer the output AO, refresh rate is different from the sample clock frequency

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I am an AO output in the buffer using a single channel. I have a stamp with a ripple of 200000 points with a triangular waves of a 1000pts each repeated 200 times. If I want a frequency of 1 Hz, I simply update this waveform 1000pts and if I wanted to 5 Hz, then 5000pts and so on. But there is some frequency that I won't be able to use like the refresh rate (the number of samples that I ask to update) is different from the sample clock frequency, which makes synchronization with the other difficult to trigger (incomplete cycle). Frequency 3 Hz (update 3000pts), as (update 7000pts) 7, 6 Hz (update 6000pts), 9 (update 9000pts)... 11Hz at 15 Hz and is not valid in the sense that the refresh rate is different from the sample clock frequency. That makes a whole lot of inaccessible CONFIGURED! Can someone tell me what determines the banned frequency? Is this something to do with the material?

concerning

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120 Hz, the error is currently about 400 parts per million (ppm). The accuracy of the time base is 50 ppm, then this error is less than 10 times the inherent error due to the time base.

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Event ID: 1001
Task category: no
Level: Information
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User: n/a
Computer: Tony-TOSH
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P2: 1.0.0.0
P3: 4a769d0e
P4: WindowsBase
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P6: 4b5950b7
P7: a86
P8: 18
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Symbol of the analysis:
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State: 0
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1001
4
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37886
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Tony-TOSH

1223018385
5
CLR20r3
Not available
0
tosreeltime.exe
1.0.0.0
4a769d0e
WindowsBase
3.0.0.0
4b5950b7
A86
18
System.InvalidOperationException

C:\Users\Tony\AppData\Local\Temp\WER7C9E.tmp.WERIn ternalMetadata.xml
C:\Users\Tony\AppData\Local\Microsoft\Window s\WER\ReportArchive\AppCrash_tosreeltime.exe_25c5a 6496c7ad44943ce88637e3389e8a80bd45_07f0c745

0
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6259 analog integrated Output error with the sample clock

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