A microprocessor controled electronic distance meter

To realize fully the impact of electronic distance measurement on surveying technology, one must have had the experience of measuring a distance with a steel tape. However, an appreciation of the method used in making a distance measurement and the relative ease with which the measurement is made can be gained by understanding the basic operation of the HP-3805 electronic distance meter. So, this article begins by discussing distance meter operation, and then describes the microprocessor that was incorporated into the electronic distance meter. Next, the criteria considered in choosing the microprocessor are reviewed. Finally, we will point out the benefits of the union of a microprocessor and a distance meter to the design team, the manufacturer, and the customer.