Automatic Testing of Pressure Transducers for Fuel Injection Systems

A unique system has been developed for evaluating the performance of large numbers of pressure transducers with minimal operator interaction. The system implements the determination of zero-set, slope, linearity, and temperature coefficient, and prints out the raw data--as well as a histogram--at the end of each 200-unit run, with out-of-tolerance conditions annotated. Such a run, on the present test line, requires approximately 3.5 to 4 hours, most of which is spent bringing the units to the specified test temperatures.