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Thursday, March 17, 2011

EMF meter

What Is An EMF Meter
An EMF meter is a device that is able to detect and measure an electromagnetic field. EMF meters are available in many different types and can be used for a variety of applications, including ghost hunting. Most EMF meters are “AC EMF meters” and can only detect the rate of change in an oscillating magnetic field. Commercial-grade EMF meters can be found, however, that are able to detect specific electromagnetic frequency ranges. While any EMF meter is generally capable of taking accurate measurements of most electromagnetic fields, the user should do research before purchasing an EMF meter for any specific project, experiment, or task.
How An EMF Meter Works
In a basic EMF meter, a coil is connected to an amplifier that is then connected to an inverter and a gauge. When an electromagnetic field is present, it induces a small voltage in the coil. This voltage is then amplified several thousand times in order to give a measurement that can actually be represented in terms that average people can understand. The voltage is then passed along to an inverter that converts the AC (Alternating Current) electricity into DC (Direct Current) electricity. The DC voltage is then relayed to a guage that displays the measurement in Volts, Hertz, Teslas, or another form of measurement.

EMF meters can be used for a wide variety of applications. For example, EMF meters are commonly used for detecting leaks from microwave ovens, detecting radio frequencies, and measuring output levels from electrical appliances. EMF meters are also used in the research of ghosts and other paranormal phenomena as it is believed that these paranormal entities radiate their own electromagnetic field and can cause disturbances when in the presence of other electromagnetic fields, such as those being emitted from power lines, households, and large electrical appliances.
EMF meters are very easy to use when handled by an experienced user and pose no risk to the user or nearby appliances. EMF meters are compact and can fit into most travel bags, toolboxes, and other storage containers. EMF meters are available in many different types and can be calibrated to measure specific frequencies ranges, making them ideal for situations that call for a precise measurement. EMF meters also only measure alternating current, which is usually emitted from man-made appliances, and are not confused by direct current, which is naturally produced by the Earth’s geometric field.
EMF meters are available in a wide variety of types but the most sensitive models can be quite expensive. Also, single-axis EMF meters must be tilted and rotated on three different sides to measure all three dimensions of an electromagnetic field. Tri-axis EMF meters are able to measure all three dimensions of an electromagnetic field but these are more expensive than single-axis models.
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