[{"data":1,"prerenderedAt":24},["ShallowReactive",2],{"content-vibration-meter-en":3},{"about":4,"steps":7,"faq":11},[5,6],"The vibration meter uses your smartphone’s accelerometer as a simple seismograph. Put the phone on a washing machine, a workbench, a 3D printer or the floor, and you see the vibrations live as a curve – as a total value or split into the X, Y and Z axes.","The tool computes the RMS and peak of the last four seconds in m\u002Fs², remembers the maximum and finds the dominant frequency with a Fourier analysis. That helps you find out at which speed a machine runs rough or whether damping works. Gravity is removed from the readings. Sound instead of vibration is measured by the [[sound-level-meter]], frequencies in a sound are shown by the [[spectrum-analyzer]].",[8,9,10],"Open the page on your smartphone, tap “Start measuring” and, on an iPhone, allow access to “Motion & Orientation”.","Lay the phone flat and as firmly as possible on the vibrating surface. Don’t touch it while measuring.","Read RMS, peak and frequency. “Hold” freezes the curve, “Reset” starts over.",[12,15,18,21],{"q":13,"a":14},"Which frequencies can a phone measure?","Browsers usually deliver motion data at about 60 values per second, some devices at more. Vibrations up to about 30 Hz can therefore be detected – enough for washing machines, slow fans, building and floor vibrations. Faster vibrations, e.g. from electric motors, appear distorted or not at all.",{"q":16,"a":17},"What does RMS mean?","RMS (root mean square) is the quadratic average of the acceleration and describes the strength of a vibration over time. The peak is the largest single value. For an even sine vibration the peak is about 1.4 times the RMS; much higher peaks indicate impacts.",{"q":19,"a":20},"Can I measure earthquakes with it?","A strong nearby earthquake would show up, but the sensor is far too imprecise and noisy for real seismological measurements. The tool is meant for vibrations at home and in the workshop, not as a warning system.",{"q":22,"a":23},"Why doesn’t it work on my laptop?","Laptops and desktop PCs almost never have an accelerometer the browser can read. On a computer, the page shows a QR code to open it right on your phone. On an iPhone you also have to allow access to the motion sensors.",1793808252947]