Read from channels

[kdm7]

What is the advantage of reading 25 samples each from 6 channels 10 times to get a 6x250 array , instead of reading directly 250 samples per channel to get 6x250 array of data? Sampling rate is 1000. 

[P@Anand]

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@kdm7 wrote:

What is the advantage of reading 25 samples each from 6 channels 10 times to get a 6x250 array , instead of reading directly 250 samples per channel to get 6x250 array of data? Sampling rate is 1000. 

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It depends on the type of signal you read. What is the actual requirement? What is the 1000 sampling rate when you are trying to read 250 samples? 250 samples/second? Please explain

[Dennis_Knutson]

Difference is mostly how fast a graph will update.

P
The number of requested samples does not change the sample rate.

[kdm7]

Okay

Does using "daqmx read" 10 times in one frame read the same 25 samples 10 times ( i.e again and again)? 

[P@Anand]

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@Dennis_Knutson wrote:
Difference is mostly how fast a graph will update. 

P
The number of requested samples does not change the sample rate.

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Yes it is true when you read the channel with Multiple samples. But When I read the channel 1 single value (1 sample on demand) on every iteration of the loop (Lets say my loop runs at 100 Hz), then what determines my sampling rate?. I am trying to understand, please advice.

[Dennis_Knutson]

No, each time the read is called, you get new samples.

[P@Anand]

So can that be called a 100 Hz sampling rate? Or any other technical term to denote that?

[Dennis_Knutson]

Because of jitter, I'd say you have an unknown sample rate.

[kdm7]

Dennis,

Okay.

Which method updates the graph fast? Reading 25 samples(new samples each time) 10 times or directly reading 250 samples?

Both take 0.25 seconds( if sampling rate is 1000) right? 

[P@Anand]

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@Dennis_Knutson wrote:
Because of jitter, I'd say you have an unknown sample rate.

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Yes, I agree with this.