Obtain Queue Data Type

I am working my way through my first Producer Consumer vi and have two questions.
1. The data I am enqueuing is x,y,z acceleration samples of type Waveform. The snippet shows how I set the data type in Obtain Queue. It's rather ugly and disturbing even though it appears to work. Is there a more elegant and beautiful way to set the data type?
2. The sample rate of the accelerometer is 5120 Hz. The DAQmx Read buffer is of lenght 1024 samples. Hence, it takes 200 [ms] to fill the buffer. I've set the metronome to 100 [ms] to ensure that the Producer doesn't miss any samples. That means the Producer While Loop will spend a good portion of its time waiting. Right? Does having wait cost anything?
In LabVIEW's ProducerConsumerExample.vi the sample rate is 10000. The Read buffer size is 1000. And the metronome is set to 100 [ms]. The sample rate of the device comes from the hardware device in the cDAQ. The 100 [ms] interval comes from the PC. Won't there be a mismatch? I'd like to understand this before I set my metronome to 200 [ms].
Solved!
Go to Solution.

Arizona_Joe wrote:
So, can you shed some light on the behavior of the While Loop you mentioned that does not have a metronome and is is paced by DAQmx? I would think it would do a lot of spinning.
It isn't spinning because it is waiting inside of the DAQmx Read for N samples to be gathered. That is not an instant data request. It takes time to gather those samples. That length of time is dependant on your sample rate and how many samples you are requesting. So because it is waiting inside of the DAQmx Read, there is no need to add an additional wait. Let the DAQmx Read limit the loop rate.
It is actually just like the consumer loop for the Producer Consumer. The reading of the queue will limit the rate at which that loop runs. Therefore, it needs no wait.
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i have a Q that has a cluster as element data type.
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