Design and performance characteristics of a high-speed wide-chart recorder

During the past decade, the requirements for null-balance instruments have greatly changed. Dynamic testing applications have increased the need for accurate, high-speed measuring devices. Specifications such as a span of 50 millivolts and full-scale response time of 5 seconds are supplemented with requirements for a span of 1.0 millivolt and a full-scale response time of less than 0.5 second. Such instruments are important in the fields of rocket or jet engine testing, wind tunnel measurements, automatic machine tool positioning control, and analog-to-digital readout systems using high-speed card punch or print-out operations.