I want to choose the right sampling rate such that I don't have too much data or very less data.(saving time with all the information needed).
Hello Chitaranjan Pany
thank you for the crisp explanation.. I have few doubt though
* How would I know the highest frequency?
* Is the thumb rule applicable for both Time domain and Frequency domain analysis..!!
For example: If I am measuring the vibration of a motor. I get time vs amplitude graph. For measuring the vibration in Matlab, I have to set the sampling time and rate. The motor is running at 1500 rpm.
Hi
The simple answer is that without prior knowledge, there is no way for you to know what is the correct or best measurement settings with respect to frequency range or amplitude resolution.
You have to find your way by trial and error to buildup your knowledge.
As you want to measure on a motor, things should be quite repeatable. Try with the widest setting you have, then narrow them down to whatever captures relevant features and is convenient to work with.
If you want to learn the nuts and bolts on practical measurement, signal analysis and machine troubleshooting, take a look here
https://qringtech.com/learnmore/recommended-reading/
Sincerely
Claes
Due to my experience the sampling frequency in many times is due to the total measuring time. Is the measuring du to a few minutes sample whatever you are capable of. If the measuring shall continue for a long time (whatever that is) Think about what kind of frequencies are interesting and beware that you sample so you can analyse almost twice that frequency. Roughly 4-5 times the interesting frequency, but do not over do it. Use a lot of common sence eventhogh things should be strictly scientifical.
8 samples per wave. Sampling rate 8x the oscillation rate. It will catch the peaks, and the transition... relatively good for fft, etc...
Good question Syed Shaul Hameed. I have the exact same question. If I do not have any prior knowledge of the vibrating device I want to measure the vibrations of, how do I set the sampling frequency of my accelerometer that I am using to measure the vibrations?
Theoretical it is 2.56 times the maximum analyze frequency but if the measuring time is short sample much higher. You can always resample after. Often the test is one shot and then it is far more efficient to have to much data.
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