RESUMEN
To develop a standard defibrillation energy source which can output monophasic and biphasic de-fibrillation impulses and can display standard energy values. The storage capacitor was charged by single-end flyback transformator and discharged through the H bridge composed of insulated gate bipolar transistor (IGBT). Impulse voltage and current were collected by divider while discharging, and the energy value was calculated by STM32. The en-ergy value and waveform were displayed through the control module. The energy source could output both monophsic and biphasic waveforms, and the accuracy of displayed value was higher than ±2% or ±1 J. The standard defibrillation energy source can be used as standard device for defibrillator analyzer, and the metrological trace-ability system of defibrillation energy may come to be completed.
RESUMEN
Firstly,this article analyzes the requirement of the standard voltage for the ECG & EEG verification instrument.Then it analyzes the feasibility of measurement using 34401A multimeter and provides the test method.This method is proved to be exact and reliable by experiment.
RESUMEN
Objective To determine the purity of sodium nitrite(NaNO2) using in stray light standard substance which was applied to check semiautomatic clinical chemistry analyzer.Methods Titration was used to determine the purity of NaNO2,the uncertainty of the purity was assessed,and a parallel test was used to validate the uncertainty.Results The purity of NaNO2 was 99.81%,and its uncertainty was 0.86%.Conclusion The uncertainty of the purity passes the validation,it shows that the purity test is credible,and its uncertainty assessment is logical.
RESUMEN
The digital EEG instrument is the use of that the electrical activity of cerebral cortex are extracted and recorded by electrodes, which diagnose and treat the human brain and nervous system. The examination methods that is strong interoperability is introduced based on JJG 954 -2000 Digital Electroencephalogram Mapping & Brain Electric Activity Mapping and combined with practical work experience for years.