Thread Subject: delay getdata, start(analoginput)

Hi, I'm using the data acquisition toolbox to continuously sample from an analog input channel of a National Instruments card. However, there seems to be a varying delay of at least 40 ms between signal change and matlab response. This is due to the functions "start(ai)" and "getdata(ai)". Is there a way to speed up the acquisition, maybe by changing the analog input object configuration? My current configuration is as follows:
 
SampleRate: 10000
SamplesPerTrigger: 2

I'm looping through following code:

                start(ai)
                pause(0.001);
                data = mean(getdata(ai));
                stop(ai)

Thx for any response.

Jonas

Hi Jonas,
Rather than stopping and restarting the analog input object, which will introduce the delay you are seeing, use callbacks which you can begin learning about here:
http://www.mathworks.com/access/helpdesk/help/toolbox/daq/f9-34753.html

Pay particular attention to the Timer and SamplesAcquired events.

All the best,
Sherryl