A Digital Recorder for Pendulum Measurements

A portable, moderate-speed digital recorder is required for the Bronze Pendulum Apparatus of the Dominion Observatory, Canada. A review of available event recording methods reveals that, in general, contemporary recorders are too bulky and consume too much power to be readily adapted to field applications. Consequently, a miniature 30-channel recorder, having a total power consumption of 5 watts and a speed capability of three print-outs per second, has been designed. The operating speed is limited only by the chart transport mechanism, as the recording medium is capable of speeds greater than two thousand print-outs per second.