Abstract
The Standards and Calibration Laboratory (SCL) has set up calibration facility for the calibration of defibrillator and defibrillator analyzer. Defibrillators are medical devices designed to resume normal heart pulse of a patient by discharging energy pulse to a person who is suffering from an emergency cardiac attack. They are commonly used in hospitals and medical institutes. At the SCL, the energy delivered by a defibrillator is measured using a high quality digital sampling system. The system comprises a high voltage divider, a sampling voltmeter, an impedance analyzer and a control computer. The sampled voltage waveform is digitally processed to derive the delivered energy. The system can also be used to check the accuracy of a defibrillator analyzer. The sampling system and its signal processing are described in this paper. To ensure the accuracy of the sampling system, it is calibrated against the laboratory's voltage and time reference standards. A standard waveform with calculable energy is used to verify the sampling system. It is shown that the system can achieve an energy measuring accuracy of better than 0.7%.
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