1. Introduction
This chapter describes the Metron’s QA-45 Defibrillator /
Transcutaneous Pacemaker Analyzer features and specifications.
1.1 QA-45 Features
The QA-45 Analyzer is a precision instrument for testing defibrilla-
tors 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 require-
ments. QA-45 has a built-in load resistance of 50 ohm, which
roughly corresponds to the impedance of the human body. The de-
fibrillator pads are placed on the QA-45 contact plates. Thus, the de-
fibrillator is connected through the load resistance. When the defib-
rillator is discharged, QA-45 calculates and displays the energy de-
livered.
In the pacer function the QA-45 tests all types of transthoracic pace-
makers. 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 re-
fractory periods, and immunity tests, which determine the pacemak-
er’s susceptibility to 50/60 Hz interference.
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