Energy calibration technique of defibrillator analyzer

Defibrillator is one of the indispensable equipment in medical emergency system. It is mainly calibrated using commercial defibrillation analyzer. However, since the measurement criteria that various metrological services in China follow at present are not able to guarantee the traceability of calibration, the accuracy and reliability of registration inspection and measurement calibration are restricted. Therefore, it is particularly necessary to develop a set of standard measuring unit of defibrillation energy for solving the problems in measurement calibration of defibrillation analyzer and ensuring the integrity of traceability chain of defibrillation monitoring equipment. Discharge theory of defibrillator, discharge waveform and rationale of energy calibration technique of defibrillator analyzer were analyzed. Voltage divider and current divider of the developed energy measuring system as well as the methods and error analysis of energy measurement were introduced. Generation of sinusoidal signal in power source was used to check the error of system measurement. Test results showed that the error between the two test methods of self-developed measuring system was below 0.05%. However, as the nominal error of commercial measuring system has an absolute value, the error displayed is relatively large in the case of small measurement range. As evidenced in results, the developed energy calibration system is able to solve the problems in measurement calibration of defibrillation analyzer and ensure the integrity of traceability chain of defibrillation monitoring equipment.