Fast simultaneous analogue output

I am using a PCI-6229 multifunction DAQ card and DAQmx/LabVIEW 7.1.
I am attempting to do simultaneous two channel analgoue output. I have used timing property nodes to enable the simultaneous analogue output option, and have switched the sample clock to on-demand. As far as I understand, it is only possible to do a single sample on both channels at once; if a simultaneous waveform is required, then a while loop has to be constructed (I have seen the sample NI code for how to do that)
As far as I can see, this is a software timed output. Given that the only clock I then have access to is the 1kHz system clock, how do I enable two channel simultaneous analogue output at (say) 10ksamples/s.
Apologies if this has already been answered, I couldn't find it.
Thanks.

Can you tell me more about what your inputs and outputs need to be. Do you have any code? even broken code? I think I'm working on something similar, but I don't quite understand what you are trying to do.
-Rick

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Simultaneous analog output 1k sine wave and data acquisition

Although many topics of simultaneous analog output and input can be found in NI Developer Zone, I have not found a case similar to my project. I'm trying to generate a 1kHz sine wave by using the analog output of NI DAQPad-6070E, and acquire one channel input signal simultaneously. I found most of the examples can not work properly above 100Hz. Any suggestions are welcome. Thank you.
Jian

I have sucessfully solve the problem when I observed the increase of
scan backlog number. Simply increase the buffer size of AI/AO and you
can make the 1kHz sine wave output and data acquired properly.
On Tue, 3 Feb 2004 09:03:07 -0600 (CST), jujian wrote:
>Although many topics of simultaneous analog output and input can be
>found in NI Developer Zone, I have not found a case similar to my
>project. I'm trying to generate a 1kHz sine wave by using the analog
>output of NI DAQPad-6070E, and acquire one channel input signal
>simultaneously. I found most of the examples can not work properly
>above 100Hz. Any suggestions are welcome. Thank you.
>
>Jian

Optical audio but Analogue output

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Oh yes, this is the reply I was looking for, so in this case I could avoid using the analogue output (RCA) on ATV ? In the case I'm going to use it anyway which will be the channel used by ATV for outputting audio ?
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Can I get an analogue output from Apple TV?

I am trying to connect my Apple TV to the Zone 2 of my AV receiver and it requires an analogue output. I purchased a digital to analogue converter and am running an optical cable from the Apple TV to the converter. It hasn't worked. Is there something I should be doing or trying?

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Error 10800 when doing Analogue Output with DAQPad-6070E

I'm trying to test out the Analogue Output from my DAQPad 6070E (Firewire). I'm using the Example vi 'Generate N Updates', but get an error:
Error 1080 occured at AO Control
possible reasons: NI-DAQ LV: The opereation could not complete within the time limit.
This example seems to work fine on a PCI E-series card, But the example claims it should also work fine on the DAQPad 6070E.
It seems to sometimes work ok the first time I try after power cycling the DAQPad.
I've tried updating to the latest version of NI-DAQ, with LabView 7.0, Windows 2000.
If i used the test button from withing MAX, then the DAQPad seem to work fine with continuous output of a sine wave.
Any help much appreciated.
Ke
ven.

This is certainly not a solution, especially if you need a lower output rate/buffer.
I've got the same problem with my DAQPAD 6052E. I traced it down to AO START vi. It appears when the output buffer is less than 1000 and the number of output buffer iterations is set to 1. The error does not appear when in the continuous output mode (number of buffer iterations is "0"). I talked to tech support, and they know about the problem, but they do not offer any solutions, except for using a larger buffer. Simply speaking, it is a bug in the driver, which they haven't fixed yet. Way to go, NI.

Analogue output digital output

Hello,
I managed to create my VI in the proper way I think. I am trying to send a ttl every time my analogue output crosses zero. All whats left now is to transform the analogue data into a digital data and input it into the dammx write for the DO line. I would like to trigger on the zero corssing of the waveform and other intervals which I can select. Attached is the VI, I have created. I have trried to use a loop and find the zeros, but I think its simpler than that. I would also like to add the functionality of triggering eery nth zero corssing since the device I am triggering has a lower max freq then my drive signal
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Attachments:
AOTTL.vi ‏209 KB

Hi James,
Thank you for that, Attached is screen shot of the TTL and the analogue output. As you can see the TTL are not trigerring at a specefic instance with relation to the AO, and the pulse width varies(although this is not critical as I am triggering on the rising edge). I think the best solution would be to generate another simple waveform (WV2) at the same time of the equation waveform with the same frequency (low). Then use that signal to generate the trigger at zero crossing (WV2 labelleb in vi). Then to vary the phase with relation to the AO signal shift the simple waveform by a known phase and still trigger at zero crossing. Attached is the trigger illistration and a VI that shows the generation of the other waveform used for triggering. I have been trying to do this but to no avail.
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Attachments:
AOTTL.vi ‏241 KB
Trigger illustration.jpg ‏145 KB

Excessive noise on analogue outputs

We recently installed 2 PCI6014 boards into a PC running Windows XP. The analogue outputs have about 20mV noise peak-to-peak (I estimate 10mV rms) irrespective of the setting of the output. This seems abnormally large to me, my previous experience was noise was less than 1mV with other boards.

Hello,
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1.) Shielded Cable from DAQ Board
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can i obtain the original firmware for this device?
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Maybe you should find with what firmware was it flashed and try drivers for that device.
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patrick85 wrote:
I bought an apple TV and updated the system to the newest version. The Apple TV is connected by a HDMI-to-DVI converter to a Samsung screen. Additionally, my hi-fi system is connected with the analogue output of the Apple TV, because no audio signals can be transfered to my monitor via DVI.
To hear just something, I need to amplify the audio signal that much with my hi-fi system. Why is the analogue output of the Apple TV so weak? When I connect a iPod to my hi-fi system, i don't need to amplify it that much!
Does anybody have a hint, what's the problem? The Apple support told me, that it seems to be normal? Does anybody have the same experiences / problems?
if your hi-fi system has an optical in jack, connect ATV and stereo with a toslink cable.

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i am working on a level control system which has an analogue input (0-10V level measurement probe) and an analogue proportional valve analogue output. I have configured the AO to be 0-10 volts in the measurement and explorer but when running the labview program it reverts to -10 to 10volts.Therefore if i set a tank to be filled to a setpoint of 3 volts it will do this but if i set the set point back to 2volts when the probe is reading 3V the Analogue output reverts to a negative output and opens the valve to fill the tank even if the setpont is reached.
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Hi, thanks for your reply. The card is a PCI-6024E type the version of labview is Labview 6.Enclosed please find my labview code and front panel as an attachment.
Thanks
Micheal Hennessy
Attachments:
PID_auto_Control_Loop.vi ‏70 KB

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Hi,
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Richard

Thanks
Files are attached save under version 11.0/
Attachments:
MeasureFreqandGraphSpeed.vi ‏13 KB
ObtainSpeed.vi ‏23 KB

Analogue output from airport express

Is there something odd about the output in analogue?
I have two analogue inputs I use on my home stereo. From the airport and from Sky. To save me switching cables all the time, I bought an analogue hub.
Sky works fine, it doesn't like the airport. Sky will work in any of the 3 inputs but airport will work in none of them. Oddly, as I change channels from input 1 to 2, there is a fleeting hearing of the airport output. Direct connection to the stereo Works fine.
This is all a bit odd to me but perhaps I am being really dim. Any thoughts?

If you temporarily connect a pair of stereo headphones to the audio port of the 802.11n AirPort Express Base Station (AXn) does the audio quality appear to be normal? If so, then the AXn is not the issue and it could be the cables, the analog hub, or the stereo.

Simultaneous audio outputs on MacPro?

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Are you finding that you can not create and save the Aggregate Device with the Audio MIDI Setup utility? If so, then you might be experiencing the same issue that I appear to have just overcome.
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Fast simultaneous analogue output

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