The QA-45 Analyzer is a precision instrument for testing defibrillators and transcutaneous pacemakers, and is designed to be used by trained service technicians. The defibrillator function of the QA-45 measures the energy output, and ensures that the defibrillator complies with specified requirements. QA-45 has a built-in load resistance of 50 ohm, which roughly corresponds to the impedance of the human body. The defibrillator pads are placed on the QA-45 contact plates. Thus, the defibrillator is connected through the load resistance. When the defibrillator is discharged, QA-45 calculates and displays the energy delivered. In the pacer function the QA-45 tests all types of transthoracic pacemakers. The testing is menu driven, and simple to operate. QA-45 measures and displays a pulse’s amplitude, rate, energy and width. It also conducts demand sensitivity tests, measuring and displaying refractory periods, and immunity tests, which determine the pacemak- er’s susceptibility to 50/60 Hz interference.