WriteMultiSample with changed data - lag problem

[LiorS]

Hi,

I'm using .Net 2008 (C#), USB-6255 DaQ Mass Termination device + SCB 68.
I am connecting AO0 (Analog Output 0) to AI0, using WriteMultiSample I am writing a sin wave which is constantly changing (for example) to AO0-
and constantly reading the (same) data from AI0.
the problem is that there's a lag between each sample while reading:

an example code:

                myTask = new Task();
                myTask.AOChannels.CreateVoltageChannel("Dev1/ao0",
                                       "aoChannel",
                                       MIN_VOLTAGE,
                                       MAX_VOLTAGE,
                                       AOVoltageUnits.Volts);

                myTask.Control(TaskAction.Verify);
                myTask.Timing.ConfigureSampleClock(
                    "",
                    numberOfSamplePointsInSecond,
                    SampleClockActiveEdge.Rising,
                    SampleQuantityMode.FiniteSamples,
                    numberOfSamplePointsInSecond);

                    double[] data = new double[numberOfSamplePointsInSecond];
                    AnalogSingleChannelWriter writer = new AnalogSingleChannelWriter(myTask.Stream);
                    int i = 0;
                    for (int j=1; j<5; j++)
                    {
                        for (i = 0; i < numberOfSamplePointsInSecond; i++)
                            data[i] = Math.Sin(2 * Math.PI * ((double)i/100.0)) * (double)j;
                        writer.WriteMultiSample(false, data);
                        myTask.Start();
                        myTask.WaitUntilDone();
                        myTask.Stop();
                     }
                    myTask.Dispose();

the problem, while reading the data, there's a lag between each read (using BeginReadMultiSample/EndReadMultiSample, I know I have no problem with reading) can be seen in the attached file - there's a lag between each sample.

I guess it's the myTask.Stop() which causes the lag - but how can I change the data otherwise?
Thanks.

[LiorS]

found solution:

http://forums.ni.com/ni/board/message?board.id=232&thread.id=6412

the DoNotAllowRegeneration was all I missing. it works!


Message Edited by LiorS on 05-28-2008 08:08 AM

[masterron1]

Hello LiorS. Would it be possible for you to show your syntax after implementing DoNotAllowRegeneration? I have the same problem with my coding and, even after looking at the link you posted and following their syntax for chaging the Regeneration settings, I get an error.