The data read into the buffer HAVE lack samples at the beginning

I use a box USB-6251. The program implements two channels of AI (read I and Q) on a single task and one channel on another task. The channel uses the ai\SampleClock as its clock, so that both are synchronized. C creates a digital pulse periodic rising edge (a clock basically) which is used as a trigger on an external function generator. The signal from the unit after going through some material, external signal processing is ultimately what is read by the channel of GOT it.

We know from the relevant signals, they seem to be correctly synchronized scope. IE, the analog signal to read arrived on the channel of the AI of the acquisition of data more or less instananeously when the trigger is activated. If there is a delay, it is of the order of microseconds.

However, when I read in the buffer of HAVE (repeated FiniteSamples), waveform, I always come back has a section of samples at the beginning that seem to be returned of the first actually read data-point (see attached image). This delay is of the order of milliseconds (it varies with each series).

I want to totally eliminate this delay. The signal should be a sinusoid which begins to sample 0 and is continuous through until the last sample read.

I put the code below.

Installation program:

Create analog read the task

analogReadTask = new Task ("analogReadTask");
Create the virtual channel for the component I

analogReadTask.AIChannels.CreateVoltageChannel (initParams.AddrI.ChannelAddress, 'I', AITerminalConfiguration.Differential,-4, 4, AIVoltageUnits.Volts);
Create the virtual channel for the Q component

analogReadTask.AIChannels.CreateVoltageChannel (initParams.AddrQ.ChannelAddress, 'Q', AITerminalConfiguration.Differential,-4, 4, AIVoltageUnits.Volts);
To set the clock for the analog readings

analogReadTask.Timing.ConfigureSampleClock (string. Empty, initParams.SamplingRateHz, SampleClockActiveEdge.Rising, SampleQuantityMode.FiniteSamples, Totalechantillons);
Create the mult-channel drive

analogReader = new AnalogMultiChannelReader (analogReadTask.Stream);

                analogReader.SynchronizeCallbacks = false;
pulseWriterTask = new Task ("pulseWriterTask");
Creating a digital output channel that provides the trigger to the U/S system

pulseWriterTask.DOChannels.CreateChannel (initParams.AddrUsTrigger.PortLineAddress, "US trigger", ChannelLineGrouping.OneChannelForEachLine ");

pulseWriterTask.Timing.ConfigureSampleClock ("/ SampleClock/AI/Dev1", initParams.SamplingRateHz, SampleClockActiveEdge.Rising, SampleQuantityMode.ContinuousSamples, samplesPerPulse);

pulseWriterTask.Stream.Buffer.OutputBufferSize = samplesPerPulse;

pulseWriterTask.Stream.WriteRegenerationMode = WriteRegenerationMode.AllowRegeneration;
pulseWriter = new DigitalSingleChannelWriter (pulseWriterTask.Stream);
pulseWaveform = new DigitalWaveform (samplesPerPulse, 1, DigitalState.ForceDown);

pulseWaveform.Signals [0]. The States [0] = DigitalState.ForceUp;
analogReadTask.Control (TaskAction.Verify);

pulseWriterTask.Control (TaskAction.Verify);

From reading:

analogReadTask.Start ();
Start writing the digital pulse, however it will not start

until the AI/SampleClock begins, so implicitly synchronizing the two tasks

pulseWriter.WriteWaveform (pulseWaveform, true);
analogReader.BeginReadWaveform (Totalechantillons, readerCallback, analogReadTask);

Result (should be a sinusoid from end to end)

Always seems to solve these problems, shortly after their validation.

The problem has start the digital task AFTER the analog task. In the small delay between the two lines of code running, read analog had already begun, and so some of the impulses of the AI/SampleClock were missed by the task. The order of departure between the two tasks of switching solves the problem.

Tags: NI Software

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Suchen für alle die noch immer nach einer Antwort, ich habs jetz!

For all who are looking for this answer, I get it now!

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