I have defined [Sensitivity], but I get an error message.

clear all
close all

d = daq("ni")

ch = addinput(d, "Dev1", "ai1", "Accelerometer");

d.Rate = 44100;

ch.Sensitivity = 9.80665;

data = read(d, seconds(20));
plot(data.Time, data.Dev1_ai1);
ylabel("Acceleration (Gravities)");


%this code position is left up

Acceleration in App Designer on MATLAB as shown in the upper left of the attached photo, as shown in the lower left.

Reference URL

https://jp.mathworks.com/help/daq/build-an-analog-trigger-app.html

I want to graph it using [MeasurementTypes] as [Accelerometer].

The error message (in the attached photo on the upper right) says to define "Sensitivity", so I would like to use the code view of the reference URL: after the line break of addinput(~); at line 630, I would like to use the following line to define "Sensitivity".

switch measurementType
    case 'Accelerometer'
        
        Channels(1).Sensitivity=9.80665;
end

I have included the following

However, the

The variable 'Channels' is a structure, and the variable has been modified, but the value does not seem to be used. It is marked as.

Can anyone represent acceleration using App Designer?

I am using Matlab 2021b, NI_USB4431 and accelerometers in my environment.

I'm Japanese, so if you could use a simple syntax, that would be great...

Translated with www.DeepL.com/Translator (free version)

Answer 1

[Walter Roberson]

In your app code, you need to store the output of the addinput() call into the variable Channels

Your code at line 665 calls addinput() but does not save the output of addinput()

[文宏]

Thank you! I got the measurements!

By the way, the vertical axis is in voltage (v), is this the correct unit?

I am using an accelerometer PV-90B.

Specification: Electrification sensitivity 0.167pc/ms^-2　

[Walter Roberson]

The internal measurements would be volts, but after you set the Sensitivity, the readings you get should be in g

What model of accelerometer are you using?

[文宏]

Probably because in the source code I did not set the y-axis for the case of acceleration.

Success! : [before.png] -> [after.png]

In addition, by default, "IEPE" also has a y-axis of voltage, is that correct...?

Environment: Impact Hammer

Sensitivity: 11.2 mv/N

https://www.toyo.co.jp/pcb-pf/products_detail.php?id=086C01