Abstract：Objective To analyze the main technical indicators of the alarm system in medical electrical equipment and medical
electrical systems- the standard requirements for the characteristics of the visual alarm signal and the auditory alarm signal. Methods
Combining the design instances and the common problems, the “distance” requirement and the “operator’s position” requirement
of the visual alarm signal characteristics, the “time domain characteristic” and the “frequency domain characteristic” of the auditory
alarm signals were analyzed. The suggestions on the design of the alarm signals were provided. Results The characteristics of the
visual alarm signal and the time-frequency characteristics of the auditory alarm signal were discussed, including pulse number,
pulse spacing, interburst interval, pulse amplitude difference, effective pulse duration, rise time, fall time, pulse frequency, harmonic
quantity, the difference between harmonic and fundamental amplitude and melodies. Conclusion Correct understanding of the
standard requirements is of great significance in the product design and inspection, which helps improve the product quality and
ensure the safety of the people.
陈甜甜，张克，蒋硕，付丽. YY0709-2009医用报警系统标准难点分析与解读[J]. 中国医疗设备, 2020, 35(2): 147-149.
CHEN Tiantian , ZHANG Ke, JIANG Shuo, FU Li. Analysis and Interpretation for the Difficult Clauses of the YY0709-2009
Medical Alarm System Standard. China Medical Devices, 2020, 35(2): 147-149.
