Next, while the elevator is stationary, the vertically
acting component of acceleration (component in the
z-direction, perpendicular to the display) is selected using
an appropriate app (iOS: e.g. SPARKvue4; Android: e.g. Accelogger5)
and the measurement is started. When a person
jumps one time in the elevator, it causes it to start oscillating,
which is then recorded using the app.