Digital Processing Clock and Remote Display Units Technical Operation and Maintenance Manual.

The Digital Processing Clock is designed to make precision time available in visual and electronic form. The system consists of one digital processing clock and four remote display units and contains state-of-the-art electronic devices. In all instances where it has been available, military-specified hardware has been utilized. The clock provides all necessary timing information to enable the generation of a wide range of time codes and time related information for future applications. Figure 1-0 gives a front view of the Digital Processing Clock. The clock is human engineered for easy setting. It is designed to be driven by precision frequency standards such as cesium beams, rubidium vapor standards, disciplined time and frequency standards, or any other precision frequency standard providing an adequate 1 MHz output, but will operate on its own internal oscillator if no precision standard is available. The clock is capable of being set to an accuracy within 1 microsecond to an applied external pulse. This pulse need not occur on precise 1 second intervals prior knowledge of when the pulse will occur is used to preset the thumbwheel switches on the front of the clock.