Data Sampling and saving

[Rama2141]

Hi! I am using accelerometers to collect my signal using NI DAQ. How do I know what units are displayed in the LABVIEW software. There is an option of entering the sensitivity value of the accelerometer while setting up. But I think the values which are displayed are not consistent or I do not know the unit (Is it in miliVolt or Volt or g or in m/s2 or something else?). Kindly help. How do I confirm the same? Thank you.

[kosist90]

Which exact hardware module do you use? If you create DAQmx task like on the example below, there is possibility to set units of the measurement, and sensitivity units.

[Rama2141]

@ kosist90

Hi! Thank you for your reply. I am not aware of this DAQmx task as you have shown. I am taking the sample using the following video by Measurement Lab:

https://www.youtube.com/watch?v=L-pwsTSYCkY&ab_channel=MeasurementsLab

I am using PXI e1073 Chasis with PXI 4496 module. Hope this helps. Thank you. 

[kosist90]

OK, I see now. But if you follow the video, there are Voltages as the output units. Also, there is shown how to set sensitivity - you need to convert sensitivity from mV to V, because output value is in Volts.

But overall, while creating DAQmx task by DAQ assistant, instead of Analog Input -> Voltage, try to select Analog Input -> Acceleration -> IEPE. It will have more specific settings than simple voltage input measurement.

[Rama2141]

Yes, I am using Read Analog Input --> Acceleration, Then it gives me the option to write down sensitivity value with units. Then I display the signal as I measure. Now my question is what will be the units of this displayed signal? Will it be in mv or V or g or in m/s2? That is, does the software convert it from volt unit to acceleration unit or not? How do I confirm that? 

Thank you.