DIN EN 61689-2013
超音波学.物理疗法系统.频率范围0.5 MHz至5 MHz的现场规范和测量方法(IEC 61689-2013).德文版本EN 61689-2013
Ultrasonics.Physiotherapy systems.Field specifications and methods of measurement in the frequency range 0,5 MHz to 5 MHz (IEC 61689:2013); German version EN 61689;2013