2013EN 61689:2013 Ultrasonics - Physiotherapy systems - Field specifications and methods of measurement in the frequency range 0,5 MHz to 5 MHz
2007EN 61689:2007 Ultrasonics - Physiotherapy systems - Field specifications and methods of measurement in the frequency range 0,5 MHz to 5 MHz (Remains Current)
1996EN 61689:1996 Ultrasonics - Physiotherapy Systems Performance Requirements and Methods of Measurement in the Frequency Range 0@5 MHz to 5 MHz