A digital data-recorder for dense storage of continuous voltages

The digital data-recorder stores in digital form continuous voltages from various transducers. It records for 8 minutes with 0.5-per-cent precision one channel of 1,600-cycle bandwidth and eight channels of 200-cycle bandwidth each. The design provides for additional amplitude-modulated (a-m) channels, with a bandwidth up to 80 kc if the operating time is reduced. The volume specification for the recorder is 500 cubic inches. Because of the digital representation of the data, more information can be stored in the limited space, the data can be reduced automatically, and calibration is simplified. While this paper gives block diagrams and wave forms for a specific application, the results are applicable for many instrumentation systems.