Helfrick, Albert D. Modern electronic instrumentation and measurement techniques / Albert D. Helfrick and William D. Cooper. - 1st ed - New Delhi : PHI Learning Pvt. Ltd., 1990 - xii, 446 p. : ill. ; 24 cm. Includes bibliographical references and index. Subjects--Topical Terms: Electric measurements.Electronic measurements. Dewey Class. No.: 621.381 / HEM