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About the application:

Acceleration measurement and determination of the relevant frequency, the acceleration and the amplitude of the oscillation Explanation of the buttons arranged on top of the screen CONTI: Continuous measurement 5 SEC: Fixed measurement duration of 5 sec, then STOP automatically STOP: Stop of measurement, the latest 5 seconds are displayed -: In stop mode, move zoom window (1.28sec) to the left, only for PRO ver +: In stop mode, move zoom window (1.28sec) to the right, only for PRO version There are seven figures below the buttons. Upper figure "Current acceleration values": The accelerations values are displayed. The sampling frequency of most smartphones is 50 Hz. If the actual sampling frequency deviates by ± 1 Hz, then the actual sampling frequency appears (flashing). Various times must then be corrected accordingly. The numerically displayed measured values are corrected automatically. During a swipe action "from bottom left to top right", the APP goes into a diagnostic mode. Then the actual sampling frequency, the standard deviation of the sampling frequency and an internal counter appear. Underneath figure "Accelerations over time": It shows the accelerations curve of the latest 5 seconds. After pressing STOP, a window of 1.28 sec is marked (vertical black bars). in PRO ver: the window can be moved by ±, after a double-tap on the figure it appears twice as really big, after other double-tip it is resized once more. Swipe up, swipe down to change the scaling. Underneath figure "Biggest of the three acceleration components curve": It shows the acceleration component with the maximum acceleration change. The zoom window is represented by 1.28 sec. It is particularly suitable for oscillation frequencies from 1 Hz to 15 Hz. The more sinusoidal the time signal, the more safe are the determined values. In diagnostic mode, trigger points and sine approximations are visible. In PRO ver: after a double advice on the figure it appears twice as really big, after other double-tip it is resized once more. Swipe up, swipe down to change the scaling. Underneath figure "Numerical evaluation from the time signal": Here evaluations from the time domain are displayed numerically. In the diagnostic mode, the number of detected vibrations are displayed. Sx is their standard deviation. The larger n and smaller Sx, the safer the values determined. The acceleration amplitude also specifies a standard deviation. The calculation is done with the least square method. Underneath figure "FFT-writing of the acceleration over time": Here, a plot of the acceleration spectrum over time is shown. Shown are the latest 5 seconds. The zoom window is marked. In PRO ver: after a double advice on the figure it appears twice as really big, after other double-tip it is resized once more. Swipe up, swipe down to change the intensity scale. Underneath figure "FFT spectrum of the zoom window": It shows the FFT spectrum within the zoom window. The black curve is the resulting acceleration. In PRO ver: after a double advice on the figure it appears twice as really big, after other double-tip it is resized once more. Swipe up, swipe down to change the scaling. Underneath figure "FFT, numeric": It is the numeric output of the FFT spectrum within the zoom window. The maximum of the FFT is indicated by a cross. Frequency, Amplitude and maximum acceleration values are shown.