/// <summary>
/// Create DAQ Task with trigger
/// </summary>
/// <param name="properties">The properties of the task</param>
/// <returns>The task to be activated</returns>
public Task CreateTriggeredTask(TriggeredTaskProperties properties)
{
//
// Create anaglog input task with the specified name
//
Task analogInputTask = new Task(c_refTriggeredTask);
//
// Define a voltage channel
//
AIChannel anaglogChannel = analogInputTask.AIChannels.CreateVoltageChannel(Settings.Default.DAQPhysicalChannelName0, string.Empty,
GetAITerminalConfiguration(),
-10, 10, AIVoltageUnits.Volts);
//
// Configure sampling rate
//
analogInputTask.Timing.ConfigureSampleClock(string.Empty, properties.SampleRate,
SampleClockActiveEdge.Falling,
SampleQuantityMode.FiniteSamples,
properties.SamplesPerChannel);
//
// Configure the trigger
//
analogInputTask.Triggers.ReferenceTrigger.ConfigureAnalogEdgeTrigger(anaglogChannel.VirtualName,
properties.TriggerSlope,
properties.TriggerLevel,
properties.PreTriggerSamples);
analogInputTask.Stream.ReadRelativeTo = ReadRelativeTo.FirstPretriggerSample;
analogInputTask.Stream.ReadOffset = 0;
analogInputTask.Stream.Timeout= 600000;
analogInputTask.Stream.ReadAllAvailableSamples = false;
return analogInputTask;
}
public Task CreateMultipleChannelsTriggeredTask(TriggeredTaskProperties properties)
{
//
// Create anaglog input task with the specified name
//
string name = properties.TaskName != null ? properties.TaskName : c_refTriggeredTask;
Task analogInputTask = new Task(name);
//
// Construct the the physical channel name according to the desired inputs.
//
StringBuilder physicalChannelName = new StringBuilder();
foreach (var channel in properties.ActiveChannels)
{
physicalChannelName.Append(channel.PhysicalName);
physicalChannelName.Append(",");
}
//
// Remove last ':' from channel name
//
physicalChannelName.Remove(physicalChannelName.Length - 1, 1);
//
// Define a voltage channel
//
AIChannel anaglogChannel = analogInputTask.AIChannels.CreateVoltageChannel(physicalChannelName.ToString(), string.Empty,
GetAITerminalConfiguration(),
-10, 10, AIVoltageUnits.Volts);
//
// Configure sampling rate
// Buffer's minimum size is 17
//
int bufferSize = properties.SamplesPerChannel > 17 ? properties.SamplesPerChannel : 20;
analogInputTask.Timing.ConfigureSampleClock(string.Empty, properties.SampleRate,
SampleClockActiveEdge.Falling,
SampleQuantityMode.FiniteSamples,
bufferSize);
//
// Configure the trigger according to channel 1
//
analogInputTask.Triggers.ReferenceTrigger.ConfigureAnalogEdgeTrigger(analogInputTask.AIChannels[0].VirtualName,
properties.TriggerSlope,
properties.TriggerLevel,
properties.PreTriggerSamples);
analogInputTask.Stream.ReadRelativeTo = ReadRelativeTo.FirstPretriggerSample;
analogInputTask.Stream.ReadOffset = 0;
analogInputTask.Stream.Timeout = 600000;
analogInputTask.Stream.ReadAllAvailableSamples = false;
return analogInputTask;
}
/// <summary>
/// Get the task for the data aquisition
/// </summary>
/// <param name="settings"></param>
/// <param name="worker"></param>
/// <param name="e"></param>
/// <returns></returns>
private Task GetMultipleChannelsTriggeredTask(SBJControllerSettings settings, string taskName, RunDirection runDirection, AnalogEdgeReferenceTriggerSlope triggerSlope, double triggerVoltage, BackgroundWorker worker, DoWorkEventArgs e)
{
AnalogEdgeReferenceTriggerSlope localTriggerSlope;
double localTriggerVoltage;
//
// Determine the trigger slope direction and voltage according to sign of the measured signal.
//
if (triggerSlope > 0)
{
localTriggerSlope = triggerSlope;
localTriggerVoltage = triggerVoltage;
}
else
{
//
// Reach to contact in order to retrieve the signal.
//
if (settings.ElectromagnetSettings.IsEMEnable)
{
EMTryObtainShortCircuit(settings.ElectromagnetSettings.EMShortCircuitDelayTime, settings.GeneralSettings.ShortCircuitVoltage, worker, e);
}
else
{
TryObtainShortCircuit(settings.GeneralSettings.ShortCircuitVoltage, settings.GeneralSettings.UseShortCircuitDelayTime, settings.GeneralSettings.ShortCircuitDelayTime, worker, e);
}
//
// Determines the direction of the current -
// Either positive (then voltage is negative) or negative (then voltage is positive number)
//
bool isPositiveVoltage = AnalogIn(0) > 0;
//
// Trigger's slope depends both on voltage sign and also on the direction of measurement - break or make junction.
//
if (isPositiveVoltage)
{
localTriggerSlope = (runDirection == RunDirection.Break) ? AnalogEdgeReferenceTriggerSlope.Falling : AnalogEdgeReferenceTriggerSlope.Rising;
}
else
{
localTriggerSlope = (runDirection == RunDirection.Break) ? AnalogEdgeReferenceTriggerSlope.Rising : AnalogEdgeReferenceTriggerSlope.Falling;
}
localTriggerVoltage = isPositiveVoltage ? settings.GeneralSettings.TriggerVoltage * (-1) : settings.GeneralSettings.TriggerVoltage;
//
// Before re-openning the junction set auto range off
// so we can stay at high range suitable to E5 gain.
//
if (settings.GeneralSettings.UseKeithley)
{
m_sourceMeter.SetAutoRange(false);
}
//
// Open the junction once again as if we didn't do anything.
//
if (settings.ElectromagnetSettings.IsEMEnable)
{
EMTryObtainOpenCircuit(settings.ElectromagnetSettings.EMShortCircuitDelayTime, settings.GeneralSettings.OpenCircuitVoltage, worker, e);
}
else
{
TryObtainOpenCircuit(settings.GeneralSettings.OpenCircuitVoltage, worker, e);
}
}
//
// Create the task with its propertites
//
TriggeredTaskProperties taskProperties = new TriggeredTaskProperties(taskName,
settings.ChannelsSettings.ActiveChannels,
settings.GeneralSettings.SampleRate,
settings.GeneralSettings.TotalSamples,
localTriggerVoltage,
settings.GeneralSettings.PretriggerSamples,
localTriggerSlope);
return m_daqController.CreateMultipleChannelsTriggeredTask(taskProperties);
}
