MATLAB: DAQ at multiple sampling rates with one NI device using analog input

analog inputchanneldaqMATLABmultiple sampling rate

Hello everyone!

I'm wondering if there is any possibility of DAQ at different sampling rates using one NI device. I tried to find some documentation but with not much success. Any references?

I thought at some solution starting more than one analog input objects or setting different sampling rates for the channels. Anyone already tested some of these solutions or have another one to propose ?

Thanks in advance, Best regards,

Csaba

Best Answer

According to http://digital.ni.com/public.nsf/allkb/96FD2F4685065C7686256F25006EE8DE

The only current device that allows multiple analog input sampling rates is the Compact DAQ NI 9174 and NI 9178.

Assuming you have one of these devices, then it should be possible. It probably is not currently possible in MATLAB since I would guess that it falls into the

If specialized analog measurement capabilities such as hardware clocked digital I/O are valuable to you, please let us know by completing the form at the bottom of this page.

http://www.mathworks.co.uk/products/daq/supportedio14005.html#CompactDAQ

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There are two interfaces for data acquisition. The older Session interface and the new DataAcquisition interface. In either case, you just add input channels to your session/daq object for each input and module.

For example, with the Session interface:

s = daq.createSession('ni');
addAnalogInputChannel(s, 'cDAQ1Mod1', 'ai0', 'Voltage');
ch = addCounterInputChannel(s, 'cDAQ1Mod2', 'ctr0', 'EdgeCount');
% ... add more input channels as needed

ch.Terminal % examine the terminal and wire to it accordingly

s.Rate = 10;
s.DurationInSeconds = 1;
data = startForeground(s);

While for the DataAcquisition interface:

dq = daq("ni");
addinput(dq, "cDAQ1Mod1", "ai0", "Voltage");
ch = addinput(d,"cDAQ1Mod5","ctr0","EdgeCount"); 
% ... add more input channels as needed
ch.Terminal % examine the terminal and wire to it accordingly
dq.Rate = 1000;
data = read(dq, seconds(5));

For a comparison, between the interfaces, see:https://www.mathworks.com/help/releases/R2020b/daq/transition-your-code-from-session-to-dataacquisition-interface.html

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