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I have a question on the execution duration of data acquisition

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xiaobo wu
xiaobo wu 2014 年 4 月 14 日
閉鎖済み: MATLAB Answer Bot 2021 年 8 月 20 日
ai=analoginput('dataq',0);
addchannel(ai,0);
rates=1000;
samples=5000;
data_acq=1000;
set(ai,'SampleRate',rates);
set(ai,'SamplesPerTrigger',samples);
set(ai,'TriggerType','Immediate');
tic
start(ai)
toc
Q1. when I select 'samples' with 1000,2000,3000...
The elapsed time of start(ai) is always around 1.88 second. Could you explain this, please?
Q2. I add a sentence after start(ai)：
tic
start(ai);
DataAcq=getdata(ai,data_acq);
toc
When I select 'data_acq' as 1000, 2000, 3000...
the corresponding elapsed time is 2.9s,3.9s,4.9s,....
it is about 1 second of interval. I understand here because the rate is 1000. But when I select 'rates' as 250, and 'data_acq' as 250,500, 750,...
the corresponding elapsed time is 2.2s,2.4s,2.7s.
the interval is only 0.2/0.3s. here the rate is 250, it should be 2.2s,3.2s,4.2s...
I feel confused.
Do I set the parameters wrong?

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