Analog Dialogue, Volume 44, Number 2
Contents:
What problems am I most likely to run into when instrumenting an industrial system? They cause many lost hours troubleshooting obscure and hard-to-diagnose measurement problems.
Analog Dialogue, Volume 44, Number 2 - Kindle edition by Matthew Kessler, Chau Tran, Michael O'Sullivan, Neil Zhao, Maurice Egan, Moshe Gerstenhaber. Analog Dialogue Volume 44 Number 2. 3. The Bit DAC Is the Easiest. Part of a 1-ppm-Accurate. Precision Voltage Source. By Maurice Egan. Introduction.
Do these symptoms sound familiar? Readings slowly drift even though you know the sensor is not changing. Readings shift when another piece of equipment is turned on.
Analog Dialogue, Volume 45, Number 3
Measurements differ when a calibration device is connected at the end of an instrument cable instead of directly at the input. A Hz sine wave is superimposed upon your DC measurement input.
There are unexplained measurement equipment failures. Any of these problems can be caused by ground loops—inadvertent flows of current through "ground", "common" and "reference" paths connected to points at nominally the same potential. And all of these problems can be eliminated by isolation , the key signal-conditioning attribute we offer in all our signal conditioning series. Sometimes separate grounding of two pieces of equipment introduces a potential difference and causes current to flow through signal lines. Why would this happen if they were both grounded? Because the earth and metal structures are actually relatively poor conductors of electricity when compared with the copper wires that carry power and signals.
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This inherent resistance to current flow varies with the weather and time of year and causes current to flow through any wires that are connecting the two devices. Many factory and plant buildings experience potentials of several tens or hundreds of volts. Appropriate signal conditioning eliminates the possibility of ground loops by electrically isolating the equipment. Signal conditioning will also protect equipment, rejecting potentially damaging voltage levels before entering the sensitive measurement system. Isolation provides a completely floating input and output port, where there is no electrical path from field input to output and to power.
Hence, there is no path for current to flow, and no possibility of ground loops.
Multichannel DDS enables efficient FSK/PSK modulation: Page 4 of 4
How is this possible? How can we provide a path for the signal from input to output, without any path for current to flow?
It's done by magnetic isolation. A representation of the signal is passed through a transformer, which creates a magnetic—not a galvanic—connection. Subscribe to receive the latest articles every month! Our newsletter provides updates on newly available products, solutions, published articles, webcasts and other resources that contribute to innovative design.
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Welcome to the September issue of Analog Dialogue. Home on the Range: Unraveling the Mysteries Zero-Drift Amplifiers: Not Black Magic After All. Write a product review. Feedback If you need help or have a question for Customer Service, contact us. Would you like to report poor quality or formatting in this book?
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