![]() Many people use something made of rubber, such as a shoe sole or rubber mallet. Strike it against an object that is not real hard. We suggest striking the fork about 2/3 of the way down the side towards the base. The method used to strike the tuning fork will directly affect how clean your waveform is. So, if you are using a 400 Hz tuning fork, you need to be collecting data at at least 2000 samples/second in order to get enough of the sine wave to see it clearly on the screen. You need to be sampling at about 5 times the rate of the highest frequency signal you want to detect. Keep in mind the relationship between the sampling frequency and the signal. This way, you know that the sound signal will already be reaching the microphone when your data run starts. Be sure to strike the tuning fork first, get it in position, THEN quickly start your data run. When sampling at a high frequency, you are usually only collecting data for a very short amount of time. Many times people try pointing the tuning fork at the microphone, but the side of the microphone will actually produce a cleaner signal.Īnother common problem is the timing of the experiment. One of the best things to do to improve the signal from a tuning fork is to hold it so that the outside of the tuning fork is parallel to the face of the microphone. Hold the tuning fork very close to the microphone, almost touching it. ![]() ![]() What is the best procedure to get a clean sine wave when using a tuning fork with the microphone?
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