Noise Reduction and Isolation - mccdaq.com

Noise Reduction and Isolation CONTROLLING Noise Control Panel Grounding Controlling Noise in measurement systems is vital because it can become a serious problem Utility Circuit breaker Control even in the best instruments and data acquisi- distribution box panel transformer tion hardware. Most laboratories and industrial Hot phase A. environments contain abundant electrical- Noise sources, including AC power lines, heavy Hot phase B. machinery, radio and TV stations, and a variety of electronic equipment. Radio stations generate Neutral high-frequency Noise , while computers and Ground other electronic equipment generate Noise in all frequency ranges. Building a completely Noise - Earth Earth Enclosure free environment just for running tests and ground ground ground measurements is seldom a practical solution. Fortunately, simple devices and techniques such Fig. Utility power transformers are typically as using proper grounding methods, shielded grounded to earth ground near the transformer, and and twisted wires, signal averaging methods, again at the input to the electrical junction box or filters, and differential input voltage amplifiers first switching panel.

Measurement Computing • 10 Commerce Way • Norton, MA 02766 • (508) 946-5100 • info@mccdaq.com • mccdaq.com 1 Hot phase A

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