Sources of error in the determination of output voltage of pulse generators by pacemaker system analyzers. 
The use of threshold or pacemaker system analyzers with widely different characteristics has introduced potential sources of error in the determination of the output voltage of pulse generators.  This is further compounded by the availability of pulse generators with diverse waveform configurations and programmability capabilities.  Because of this non-uniformity, the physician must have some rudimentary knowledge of waveform characteristics and appreciate the limitations of threshold or pacemaker system analyzers to avoid the unnecessary replacement of normally-functioning pulse generators.