An electrostatic voltmeter measures surface voltage without transferring excess current charge, ensuring accurate measurements of material tension. It requires no contact and can cancel the electric field between the probe and surface, minimizing arcing and achieving high accuracy. It is commonly used in the industrial sector for various applications.
An electrostatic voltmeter measures the surface voltage of a particular material without transferring excess current charge. In other words, this instrument more accurately measures the static charge generated by the surface of a material without contributing excessive charge to the process results. When measuring the tension of a material, the current generated between the meter and the surface of the material creates a natural charge that can distort the results of the actual material tension. Therefore, an electrostatic voltmeter is essential to prevent inaccurate measurements and results.
While an electrostatic voltmeter may need to touch the surface to measure, most desired electrostatic voltmeters require no contact between its probe and the surface of a material ensuring clean results. In effect, the probe is positioned approximately 0.04-0.20 inches (1-5 mm) away from the surface, close to but not touching the material. Additionally, many of these types of voltmeters have the ability to cancel the electric field between the probe and the surface. This is possible because the voltmeter will raise the voltage of the meter’s probe to match the voltage of the surface in question. When both voltages are equal, the voltmeter is able to measure the surface voltage more accurately, often achieving an accuracy within 0.05 to 0.1 percent of full scale.
There are a number of significant benefits to using an electrostatic voltmeter beyond its high measurement accuracy rate. Such voltmeters make it easy to measure the voltage of a moving surface. Canceling the electrostatic field between the probe and the surface allows more leeway in spacing changes between the probe and the surface area being measured at any time.
Collecting data through the use of an electrostatic voltmeter also minimizes the possibility of arcing between the probe and the surface. Arc-over refers to the resultant charge created by the interaction between a high voltage surface and an instrument probe. Thanks to electrostatic cancellation, the electric arc is eliminated, allowing for more stable direct current (DC) electricity. The more stable DC electricity, in turn, leads to the electrostatic voltmeter’s remarkable accuracy when compared to its more common counterpart, the electrostatic field meter. Field meters measure the total voltage of a material and not simply the surface tension of the material, which is important for determining the electrostatic potential between the surface of a material and an industrial machine.
Electrostatic voltmeters are typically used in the industrial sector. They are used for a wide variety of applications specific to companies in that industry. Uses could include measuring the surface tension of industrial materials such as rubbers, plastics and polymers; evaluate the effects of radiation; and analyzing the properties of photoreceptors.
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