The Maximun rate of NI DAQ Card in MATLAB can not reach that in the specification.

Question

Ganwei Yan 2020-12-25

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https://ww2.mathworks.cn/matlabcentral/answers/702162-the-maximun-rate-of-ni-daq-card-in-matlab-can-not-reach-that-in-the-specification

编辑： Edgar Pena 2022-9-14

I'm using PCI 6259 and MATLAB 2020b. The Maximum update rate for a single AO output channel is 2.86MS/S according to the specification, but when I use

daqSession = daq('ni');
daqSession.addoutput('Dev1','ao0','Voltage'); 
daqSession.Rate = 2000000;

Then it says, Rate cannot exceed 1000000 in the current configuration.

Is it the limited by MATLAB? And can I achieve that specified speed using LabView or c++/c#?

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Answer 1

Chidvi Modala 2021-3-30

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https://ww2.mathworks.cn/matlabcentral/answers/702162-the-maximun-rate-of-ni-daq-card-in-matlab-can-not-reach-that-in-the-specification#answer_662414

This is a known issue and our developers are aware of it and will try to fix it in future releases.

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Edgar Pena 2022-9-14

编辑：Edgar Pena 2022-9-14

在 MATLAB Online 中打开

Are there any updates on this issue? I am able to achieve the specified sampling rate using Python and then having MATLAB call a Python script (as in the code below), but I am still unable to achieve any sampling rate above 1 MS/s with MATLAB. Doing everything in MATLAB would be much more convenient.

%%% Run Python code to control DAQ
pe = pyenv;
if (~pe.Status==matlab.pyclient.Status.Loaded)
    pyenv('Version','C:\Users\myusername\Anaconda3\python.exe')
end
path_to_file = fileparts(which('DAQ_simulation_script.py'));
if count(py.sys.path,path_to_file) == 0
    insert(py.sys.path,int32(0),path_to_file);
end
pyrunfile("DAQ_simulation_script.py",...
    f_i=freq,Fs_i=sampling_rate_Hz,ramp_rate_i=ramp_rate_mA_per_sec,max_amplitude_i=ramp_peak_amplitude_mA,duration_at_max_i=duration_at_max_amplitude)