Applies to detectors which generate a single continuous wave or quasi-continuous wave ultrasonic beam. It does not cover continuous monitoring devices which generate more than one ultrasound beam and use a flat standard probe strapped to a patient. This standard is not an equipment design standard.
BS EN 61266:1995 history
1995BS EN 61266:1995 Ultrasonics. Hand-held probe Doppler foetal heartbeat detectors. Performance requirements and methods of measurement and reporting