In the intricate web of electrical systems, ensuring precision and stability is undoubtedly critical. From monitoring frequencies to tracking signal strengths and recording vital data, specialized instruments play a crucial role. Among these instruments are Frequency Meters, Field-Strength Meters, and Recorders. Each serves a unique purpose, contributing to the smooth operation and maintenance of various electrical systems.
Continue reading “Guide to Special-Purpose Meters”
Digital amplifiers, also known as Class-D amplifiers, are a modern solution to amplify audio signals with efficiency and precision. Unlike traditional analog amplifiers that modulate continuous signals, digital amplifiers function by transforming the audio stream into a series of binary pulses, which modulate continuous signals. At the output step, these pulses are subsequently amplified and reconfigured back into an analog signal.
Coils
In both the moving-coil and moving-iron meter movements, the current being measured flows through the coil. Except for this similarity, the coils in each type of movement are different. When current flows through the coil of the moving-coil meter movement, a magnetic field is produced that causes the coil to rotate. For the coil to rotate easily, it must be as light as possible. To make the coil light, it is wound on an aluminum frame. Furthermore, the coil is made from very fine wire, and when compared with the coil in the other meter movements, it contains very few turns to keep it as light as possible.
Continue reading “Electromagnetic Meter Construction: Part 2”
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