SN EN 61689 : 1996

INTRODUCTION
1 Scope
2 Normative references
3 Definitions
4 List of symbols
5 Requirements for safety and performance declaration
6 Performance and safety requirements
    6.1 Rated output power
    6.2 Effective intensity
    6.3 Beam non-uniformity ratio
7 Conditions of measurement and test equipment used
    7.1 Test vessel
    7.2 Hydrophone
    7.3 RMS or peak signal measurement
8 Type testing reference procedures and measurements
    8.1 Rated output power
    8.2 Hydrophone measurements
    8.3 Effective radiating area
    8.4 Reference type testing parameters
    8.5 Acceptance criteria for reference type testing
9 Routine measurement procedure
    9.1 Rated output power
    9.2 Beam cross-sectional area at zp
    9.3 Acceptance criteria for routine testing
10 Sampling and uncertainty determination
    10.1 Reference type testing measurements
    10.2 Routine measurements
    10.3 Uncertainty determination
Annexes
A Raster scan measurement and analysis procedures
B Diametrical or line scan measurement and analysis
    procedures
C Rationale concerning the beam cross-sectional area
    definition
D Factor used to convert the beam cross-sectional area
    (ABCS) at the face of the treatment head to the
    effective radiating area (AER)
E Rationale behind using a limiting value for the beam
    non-uniformity ratio (RBN)
F Rationale behind using a limiting value for the beam
    non-uniformity ratio (RBN)
G Determining acoustic power through radiation force
    measurements
H The validity of low-power measurements of the beam
    cross-sectional area (ABCS)
J Influence of hydrophone effective diameter
K Relationship between the effective radiating area (AER)
    and the effective radiating area determined using the
    FDA definition
L Guidance on uncertainty determination
M Bibliography
ZA (normative) Normative references to international
   publications with their corresponding European
   publications

Applies to ultrasonic equipment designed for physiotherapy consisting of an ultrasonic transducer generating continuous or quasi-continuous wave ultrasonic energy in the frequency range 0,5 MHz to 5 MHz.