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เนื้อหาย่อ : This book is addressed to anyone with some knowledge of electricity, electronics, and circuit theory who wishes to become familiar with the great variety of electronic instruments and measuring systems available today and with the kinds of measurements they can make. Because the feld has grown so big and exhibits such diversity, we have had to omit a great deal of material both of a fundamental nature and of a specialized nature. For example, there is no chapter on de measurements as such, although many instruments used in de measurement are described fully in other chapters. At the other extreme, tremendously complex data telemetry systems such as are used in the space program are not treated, though many of the components of such systems are. Thus, we have tried to steer a course that avoids both the obvious and the esoteric, hoping thereby to provide a more generally useful book with wide appeal. Several years ago I was beguiled by the publishers into contracting to write this work. Their arguments were persuasive: the advent of the transistor had obsoleted existing books on the subject, the art had advanced greatly since these works were written, I had personally been involved with much of that advance, etc. Overcome by this suasion, I agreed to accept the assignment. My attitude at the time seemed euphoric, but now appears to me to have been more one of conceit, for as I approached my task closer, it loomed ever larger, and soon humbled me into a state of paralysis. After a long time during which I tried to delude myself that I could simultaneously write a book, be president of the IEEE, and carry out my regular job, a time during which my sense of guilt steadily grew, I had the good fortune to have John Cage offer his