24-bit analog output with Audigy Val

Is it true that the Audigy Value does support 24-bit output only for digital out? Thanks.

chapas wrote:
Is it true that the Audigy Value does support 24-bit output only for digital out? Thanks.
By the
Comparison chart and
Audigy 2 Value Specs, not true.
jiitee

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How do I configure 128 channels of DIO and 128 channels of Analog output with the availability of 3 pci slots

I have only 3 slots of PCI or 4 slots of ISA bus, I want to configure with the minimum possible modules to attain 128 channels of DIO and 128 channels of analog output. This is inturn fed to the PCM (Pulse code Modulator). The cards will be placed in industrial PC.

Associate Engineer-Marketing,
Using just those 3 PCI slots you're not going to be able to get the 128 analog output channels. You will probably want to go either the MXI-3 (PCI bus extender) to a PXI chassis or E Series DAQ card to a SCXI chassis for such a high channel count system. Which analog output cards and which digital I/O cards you will want depends on your application. You will have to decide whether you will need static or dynamic analog output as well as whether you need clocked digital I/O or not. I highly recommend contacting our internal sales department at 1-800-433-3488. They are great at helping specify systems.
Ames
Applications Engineering
National Instruments

How to synchronize two analog output with USB-6353 sharing a trigger

I'm have the need to synchronize two analog output on the same device (USB 6353) sharing a trigger signal on PFI0.
The programming environement is Visual C++ , and the code I wrote is as following:
DAQmxCreateTask ("", &Ao0TaskHandle); // is the task handle for the analog output Ao0
DAQmxCreateVoltageChan((Ao0taskHandle,"Dev1/Ao0","",-5.0,5.0,DAQmx_Val_Volts,NULL);
DAQmxCfgSampClkTiming(Ao0taskHandle,5000.0,DAQmx_Val_Rising,DAQmx_Val_ContSamps,1000);
DAQmxCfgDigEdgeStartTrig(Ao0taskHandle,"/Dev1/PFI0",DAQmx_Val_Rising);
DAQmxCreateTask ("", &Ao1TaskHandle); // is the task handle for the analog output Ao1
DAQmxCreateVoltageChan((Ao1taskHandle,"Dev1/Ao1","",-5.0,5.0,DAQmx_Val_Volts,NULL);
DAQmxCfgSampClkTiming(Ao1taskHandle,5000.0,DAQmx_Val_Rising,DAQmx_Val_ContSamps,1000);
DAQmxCfgDigEdgeStartTrig(Ao1taskHandle,"/Dev1/PFI0",DAQmx_Val_Rising);
DAQmxWriteAnalgF64(Ao0taskHandle,1000,FALSE,10.0,DAQmx_Val_GroupByChannel,AOdata,NULL,NULL); AOdata is a buffer containing a sinwave
DAQmxWriteAnalgF64(Ao1taskHandle,1000,FALSE,10.0,DAQmx_Val_GroupByChannel,AOdata,NULL,NULL);
DAQmxStartTask(Ao0taskHandle);
DAQmxStartTask(Ao1taskHandle);
What happen as result of the code is that only the Ao0 channel get the sinwave output , but not the Ao1 . It seems the two channels are not synchronized.
What is wrong in my code?
Please any help non referred to a LabView soloution , first because I'm not a LavView programmder and secondly the project impose C++ as the unique environement.
Thanks
Enky

It will depend on what you are programming the NI 5112 device with.
If you are using LabVIEW, you can use the example program attached below. In it, it will show you how this is done.
If you are using VB, VC++ or CVI, you can look at one of the NI 5112 shipping examples that are installed on your computer. These are located in the VXIPNP folder. For example, the VC++ example would be located here:
C:\VXIpnp\WinNT\NISCOPE\Examples\c\MStudioC++\5112Sync
These examples will show you how to synchronize the two digitizers.
Let me know if you have any questions about these examples.
Brian
Attachments:
Multiple_NI_PXI-5112_Synchronization_Demo.llb ‏151 KB

How to structure the DMA buffer for PXie 6341 DAQ card for analog output with different frequencies on each channel

I'm using the MHDDK for analog out/in with the PXIe 6341 DAQ card.
The examples, e.g. aoex5, show a single Timer (outTimerHelper::loadUI method), but the example shows DMA data loaded with the same vector size.
There is a comment in the outTimerHelper:rogramUpdateCount call which implies that different buffer sizes per channel can be used.
(the comment is: Switching between different buffer sizes will not be used)
Does anyone know what the format of the DMA buffer should be for data for multiple channels with different frequencies ?
For example, say we want a0 with a 1Khz Sine wave and a1 with a 1.5Khz sine wave. What does the DMA buffer look like ?
With the same frequency for each channel, the data is interleaved, e.g. (ao0#0, ao1#0; ao0#1, ao1#1, ...), but when the frequencies for each channel is different, what does the buffer look like ?

Hello Kenstern,
The data is always interleaved because each card only has a single timing engine for each subsystem.
For AO you must specify the number of samples that AO will output. You also specify the number of channels. Because there is only one timing engine for AO, each AO will channel will get updated at the same time tick of the update clock. The data will be arranged interleaved exactly as the example shows because each AO channel needs data to output at each tick of the update clock. The data itself can change based on the frequency you want to output.
kenstern wrote:
For example, say we want a0 with a 1Khz Sine wave and a1 with a 1.5Khz sine wave. What does the DMA buffer look like ?
With the same frequency for each channel, the data is interleaved, e.g. (ao0#0, ao1#0; ao0#1, ao1#1, ...), but when the frequencies for each channel is different, what does the buffer look like ?
In your example, you need to come up with an update rate that works for both waveforms (1 KHz and 1.5 KHz sine waves). To get a good representation of a sine wave, you need to update more than 10x as fast as your fastest frequency...I would recommend 100x if possible.
Update Frequency: 150 KHz
Channels: 2
Then you create buffers that include full cycles of each waveform you want to output based on the update frequency. These buffers must also be the same size.
Buffer 1: Contains data for the 1 KHz sine wave, 300 points, 2 sine wave cycles
Buffer 2: Contains data for the 1.5 KHz sine wave, 300 points, 3 sine wave cycles
You then interleave them as before. When the data is run through the ADC, they are outputting different sine waves even though the AO channels are updating at the same rate.

Simple single point analog output with NI-DAQmx in VC++ 6.0

Specs: NI-DAQmx 7, VisualStudio C++ 6.0, PCI-6722,8channel AO
We have a very simple application: set a voltage (actually 6 different channels) and keep until we want it changed again, perform the change very quickly in response to an image capturing algorithm. So I don't need any waveforms or buffering.
In this forum post http://forums.ni.com/ni/board/message?board.id=231&message.id=3283&query.id=18094 you talk about an AOOnePoint example, but I get an error that the NI-DAQ driver does not support my device.
I may need to use NI-DAQmx, but how? I have a working sample, but it seems a bit slow and certainly overkill of this simple application:
// Link with \DAQmx ANSI C Dev\lib\msvc\NIDAQmx.lib
#include "NIDAQmx.h"
void SetVoltage( double voltage )
DAQmxErrChk (DAQmxCreateTask("",&taskHandleAnalog));
DAQmxErrChk (DAQmxCreateAOVoltageChan(taskHandleAnalog,sChannel,"",m_MinVoltage,m_MaxVoltage,DAQmx_Val_Volts,NULL));
DAQmxErrChk (DAQmxCfgSampClkTiming(taskHandleAnalog,"",Freq,DAQmx_Val_Rising,DAQmx_Val_ContSamps,NUMBER_OF_AO_SAAMPLES));
DAQmxErrChk (DAQmxWriteAnalogF64(taskHandleAnalog,NUMBER_OF_AO_SAAMPLES,0,1.0,DAQmx_Val_GroupByChannel,data,&written,NULL));
DAQmxErrChk (DAQmxStartTask(taskHandleAnalog));

Sorry about this multi posting, I don't know how to delete it

How to disable SP-DIF (digital) output on Audigy

Hi, I am using Audigy 2 soundcard connected to Altec Lansing ADA885 speakers. These speakers have built-in Dolby Digital Decoder, and of course SPDIF input for this. Additionally, they have inputs for analog front and rear speakers signal. They can be switched to different operation modes : Dolby Digital decoding, Dolby ProLogic decoding, stereo, and quad modes. I have connected them to my Audigy 2 using analog connections, and also digital output. The problem is, that they process both kind of inputs (analog and digital) all the time in most modes simultaneously. For example, when I set them to "quad" mode (for gaming) they process analog signal that Audigy deli'vers them, but also they attempt to decode the signal from digital input. This produces some kind of phase distortions (basses dissappear and the sound becomes slightly muffled). Possible solutions could be : - disable digital decoding in speakers when using analog output from Audigy - this can't be done, these speakers' decoder is not configurable, - disconnect digital cable when using analog output from Audigy - obvious solution, however not very comfortable - disable "ON-DEMAND" spdif output on Audigy card and enable it when necessary. This would be most satisfying option for me. But.... is it possible at all ? Just something similar to the "Digital output only" setting in soundcard panel, but in my case i'd like to have an option of "Analog outputs only". Thanks in advance for any help Greetings, Martin

Hi Terry,
According to your description, my understanding is that you don’t want the yollow bar notification to display when you open Access documents.
This issue seems to be about the client application. Please compare the followings with the things that you did:
1.Open the documents
2.Click File->Options->Trust Center->Trust Center Settings
3.Click Protected View, unselect ‘Enable Protected View for originating from the Internet’
4.Click Message Bar, select ‘Never show information about blocked content’
5.Click Macro Settings, select ‘Disable all macros without notification’
In addition, as this issue is about Office, I commend you create a new thread in Office forum, more experts will assist you with this issue.
Office forum:
http://social.technet.microsoft.com/Forums/en-US/home?category=officeitpro
I hope this helps.
Thanks,
Wendy
Wendy Li
TechNet Community Support

Error 10403:AO Buffer Config (i just want to command an analog output)

just wanna command an analog output with a little program using intermediate vi/but when i execute it an error 10403 appears/need sone to help me

What type of DAQ device do you have? You can check the KB below about getting this error on certain boards.
http://digital.ni.com/public.nsf/websearch/6ED30C2CBB5FF447862562C10056D61B?OpenDocument
You might also try the simple example that ships with LabVIEW. Write N Updates.vi
Hope this helps.

Hardware buffered analog output single shot

Using DAQmx and M-Series hardware i'm trying to fire a single shot analog output buffered waveform. I need the output hardware timed. I'm able to output a hardware buffered waveform but can't figure on how to configure it for or stop it after prescribed number of cycle runs.
Thanks in advance.
Solved!
Go to Solution.

Hi,
You have a couple of options. You can set your timing to N
samples and you acquisition will stop when N samples have passed. Or you can
use a counter to control the clock of the analog output and then the counter
can be paused whenever you can. Before
we go and dig into the specific details of the scheme let me suggest a couple
excellent reading materials and let me know if they help. M Series Synchronization
with LabVIEW and NI-DAQmx, Continuous Analog Output
with Pause Trigger and Programmatic Grounding of Output in DAQmx, NI-DAQmx: Retriggerable
Analog Output -- LabVIEW and M Series: Analog Trigger
Source.
Also don’t forget to take a look at simpler examples like: Cont
Gen Voltage Wfm-Int Clk-Pause Trigger.vi
I hope it helps
Jaime Hoffiz
National Instruments
Product Expert
Digital Multimeters and LCR Meters

Use soundcard for analog output

Is it possible to use soundcard for analog output with LabView6?

nicke wrote:
> Is it possible to use soundcard for analog output with LabView6?
Have a look in the examples under Hardware Input and Output|Sound (LV6.1)
Dunno where it is under 6i, but the files are there.
Impressed the crap out of some Fortran hackers by showing them how
easy I could turn my laptop into a spectrum analyser.
Remove "spamkill." when replying to this message

2 analog output channels with different frequencies

Hi,
hope that somebody can help me:
I created two physical tasks, analog output channels.
I should give signals (triangle signals) to a scanner. The problem ist that I need these triangle signals with two different frequencies.
I can create the signal with each of the task, but not together. Can I solve this problem somehow?
Ah, and of course the 2 tasks should start together...
Thanks for your help!!
Telly

You didn't mention the type of device you're using, so I'll assume it's a standard MIO. A typical MIO only has one AO timing engine, so you'll have to create one task for both channels and use a single update rate for the task. You will have to make the output frequencies different by passing different data for both channels.
For example, let's say your update rate is 1KHz. The data for channel 0 is 1000 data points of a single cycle of a triangle wave. The data for channel 1 is 1000 data point of two cycles of a triangle wave. When you run the task, you will get a 1Hz triangle wave on channel 0 and a 2Hz triangle wave on channel 1.
Good luck,
Joe

Loop in combination with Analog output

Hi
I have modified the script thats translate a value in to a static analog output voltage. The value comes from another online running application. The analog output value must remain static until a new value arise. I'm using VB6 and DAQmx 8.5 on a XP computer. The DA converter is NI USB-6211. I have tried to play around with the Start/Stop and clear commands but my script still makes the program highly unstabile.
So am I using the commands correctly?. And have I setup the write commands correctly too. Can anyone allso explain how to use the command Doevent correctly
Dim taskHandle As Long
    Dim clockEdge As Long
    Dim sampsPerCycle As Double
    Dim desiredSampleClockRate As Double
    Dim resultingFrequency As Double
    Dim amplitude As Double
    Dim numSampsPerChannel As Long
    Dim numChannels As Long
    Dim errorCode As Long
    Dim errorString As String
    Dim sampsPerChanWritten As Long
    Dim XICVolt As Double
' Create the DAQmx task.
    Call DAQmxCreateTask("", taskHandle)
    ' Add an analog output channel to the task and check to see whether there is only ONE task.
    Call DAQmxCreateAOVoltageChan(taskHandle, "Dev2/ao0", "aoChannel", "-10", "10", DAQmx_Val_VoltageUnits2_Volts, "")
    Call DAQmxGetTaskNumChans(taskHandle, numChannels)
    If numChannels > 1 Then
        errorCode = -1
        errorString = "Please specify only one channel."
        Err.Raise errorCode, , errorString
    End If
Data_is_recorded:
    If Actualcycles = expectedcycles Then
    GoTo end_script
    Else
    If Actualcycles > lastcycles Then
    DoEvents
     Call DataPoint.GetDataPoint(thenumberOfDataPoint, theXvalue, theYvalue)
        XICVolt = (theYvalue / 10000000#)
    ' Write to the desired channel(s).
    Call DAQmxWriteAnalogF64(taskHandle, 1, True, 10#, _
        DAQmx_Val_GroupByScanNumber, XICVolt, sampsPerChanWritten, ByVal 0&
    Else
     lastcycles = theWF.GetActualNumberOfCycles(sampleIndex, 0)
     End If
    GoTo Data_is_recorded
end_script:
End If
call DAQmx.stopTask(Taskhandle)
call DAQmx.clearTask(taskhandle)
Best regards
Peter

David Weber wrote:
thanks lot for all the great feedback. That's really helpful. I think I'll go for the NO_MERGE hint. A first test with this looks good.Keep in mind, only undocumented hint MATERIALIZE along with subquery factoring clause WITH (for which this hint was created) will work in real queries:
SQL> select my_id as id
2       , my_id as same_id
3 from (select /*+ NO_MERGE */ xxx_test_pkg.get_id(1) as my_id from dual),emp where rownum < 6;
        ID    SAME_ID
        20         20
        21         21
        21         21
        21         21
        21         21
SQL> select my_id as id
2       , my_id as same_id
3 from (select xxx_test_pkg.get_id(1) as my_id from dual where rownum=1),emp where rownum < 6;
        ID    SAME_ID
        22         22
        23         23
        23         23
        23         23
        23         23
SQL> select my_id as id
2       , my_id as same_id
3 from (select /*+ MATERIALIZE */ xxx_test_pkg.get_id(1) as my_id from dual),emp where rownum < 6;
        ID    SAME_ID
        24         25
        26         27
        28         29
        30         31
        32         33
SQL> with t as (select /*+ MATERIALIZE */ xxx_test_pkg.get_id(1) as my_id from dual)
2 select my_id as id
3       , my_id as same_id
4 from t,emp where rownum < 6;
        ID    SAME_ID
        34         34
        34         34
        34         34
        34         34
        34         34
SQL> SY.

PICe-6259 with DasyLAB 9 - How to do Analog Output

Hi,
I'm trying to get a small project working in DasyLAB 9.0.2 and I need some serious help.
I'm working with a PCIe-6259 and NiDAQmx 8 is installed. I simply want to create a program that uses a slider to adjust the analog output on 4 channels and read the slider value on a meter. This is a fresh installation of DasyLAB.
Here's the program that I setup and the errors that I get.
I select: Modules -> Input/Output -> NIDAQ -> Analog Output.
I adjust the properties of the DAC module to include channels 0,1,2,3 and select OK. (I don't adjust any of the other properties)
I then select: Modules -> Control -> Slider
I adjust the properties of the slider to include the same channels as above.
I then select: Modules -> Display -> Analog Meter
I adjust the properties of the meter to include the same channes.
The meters and Analog output are wired in parallel.
I get the following errors:
NI-DAQmx: Error Message
Driver: Task DA00, Version: 0.15
Possibly Reason:
-> The module can process the number of "values to be written".
File: ProcessData_KONTINUIERLICH.H, Line: 39
When I press OK I get:
NI-DAQmx: Error Message
Driver: Task DA00, Version: 0.15
Possibly Reason:
-> The driver does not use all NI-DAQmx task channel names. This is not valid, reconfigure the module to use all task channels.
Note: A NI-DAQmx task for analog / digital / frequency output must not have more than 16 channels. If you need more than 16 channels for the output, you must use more NI-DAQmx tasks.
File: MODUL_DA.C, Line: 2131
Any help to point me in the right direction would be greatly appreciated.
The next part of my program will include acquiring data from the analog channels, but I need to get the AO working first. I've run into some issues with Analog Input as well, but I thought I should start with AO first.
Thanks in advance!
Chris

Here's what I did using the NI-DAQmx simulation mode:
    - create two tasks
            Analog Output - 4 channels, 1k output rate, 100 samples to write, Continuous
          Analog Input - 4 channels, 1k input rate, 100 samples to read, Continuous
    Save them. Start up or synchronize DASYLab (Under Measurement Boards Settings - NI-DAQmx - Synchronize with... in earlier versions, it's under Hardware Setup)
    - Create Slider. Open Slider properties, click on Options, Synchronize to the AO task that you created. This step is really important - it ensures that the data rate matches what NI-DAQmx is expecting.
    - Connect Slider to NI-DAQmx AO module, configured for 4 channels.
    - Create AI module. Connect to the AI task that you created.
    Press Start. It should run. I can't verify absolute accuracy in simulation mode, but, I received no errors.
    Your first error is probably the result of the timing being wrong - the Slider defaults to the "Driver" timebase. The rest of the errors seem to be a cascade off the first.
    Note - my simulation did not work without the Analog Input. It generated no data. That may be an artifact of the simulator, but, once I put an Analog Input on the worksheet, it ran okay.
    I hope this helps.
- cj
Measurement Computing (MCC) has free technical support. Visit www.mccdaq.com and click on the "Support" tab for all support options, including DASYLab.

How to trigger a TTL output with an analog input

Hello,
I have an apparatus for measuring the flame speed of various hydrocarbon/air mixtures. The chamber uses central ignition as the means for igniting the mixture. My goal is to film the ignition process with a high speed Phantom video camera. I control the ignition with an analog output signal from a SCC-68 DAQ. I would like to trigger the camera with the same signal that triggers the ignition sequence. The camera is triggered with one TTL pulse so ideally I would connect the output analog voltage signal to an input analog voltage port that would be used to trigger a counter output that generates one pulse.
I have a sample VI that triggers a digital pulse each time the analog trigger level is met and it works for what I am trying to do but I do not understand how the two channels are connected. I also can't figure out how to make the VI end after just one pulse. In the VI the digital counter is supposedly triggered using the /Dev1/ai/StartTrigger slot on the DAQ but nothing is connected to this slot.
I need to first figure out how to make the output_pulses_on_sine_wave.vi terminate after a single pulse is generated. Then I can try to incorporate it into the VI that I use to control the ignition and measure the temperature and pressure once the mixture is ignited.
John
Attachments:
output_pulses_on_sine_wave.vi ‏27 KB

I am using the USB-6259, sorry for the confusion. I would be nice if I could trigger with an analog signal to the ignition system but it is controlled with a high voltage relay that operates when 12 volts are supplied to it. It really isn't a trigger as much as powering on the high voltage relay. To control it, I have a 12 V supply line that is switched closed using a SCC-RLY module. Could I somehow connect the 12 V supply to one of the buses and use a digital trigger to supply the 12V on command to the high voltage relay?
Thanks for the quick response.

Do we have Digital to Analog converter with high current output?

Do we have Digital to Analog converter with high current output? I need 8 channels and each channel has at least 100mA current output.Thanks!

I have never heard of such a device. You will probably need to follow the D/A with an amplifer for each channel.
What is the voltage range and speed required? Any special protection requirements (such as current limiting)?
Lynn

What is the best way to Sync Digital Output(TTL) with Analog Output?

I am trying to generate Analog waveform that synchronize the rising edge of a digital signal(TTL). The ttl will be used as trigger for camera. The board I have is USB-6343X. In my draft, I used a clock as ttl so I can tune frequency easily. Could any one tell me what's the best way to accomplish such task? My draft seems working, but I hope there's more neat way. Thanks in advance for any help!
Kind regards,
Eric

Hi Econg,
You should be able to trigger your TTL output with the analog output by using the ao/StartTrigger as your trigger source on the counter task. You wouldn't have to have the extra Get Full Terminal Name.vi in your analog output task.
Here is an example using your modified code. You will have to change the cDAQ1/ao/StartTigger to *your device*/ao/StartTrigger, but it should then trigger the counter output at the exact time when the analog output starts.

24-bit analog output with Audigy Val

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