Industrial production site for measuring instrument types have a lot of kinds, such as used for the flow measurement of electromagnetic flow meter, intelligent ultrasonic flowmeter
, which is used for liquid level and pressure measurement of liquid level transmitter, pressure transmitter, such as instrument, are a common feature is the need of external power supply.
Electromagnetic interference suppression method mainly has three kinds: shielding, filtering and grounding.
1, shielding shielding is used to reduce electromagnetic field inward or outward penetration measures, generally used in isolation and attenuation radiated interference.
Block according to the principle of electrostatic shielding, electromagnetic shielding and magnetic shielding.
Electrostatic shielding is to eliminate the effect of two circuits, electromagnetic interference caused by distributed capacitance coupling between shield with low resistance of metal materials, shield must be grounded.
Electromagnetic shielding role is to prevent the interference of high frequency electromagnetic field, the shield with low resistance of metal materials, use of shielding metal absorption and reflection on the electromagnetic field to achieve the goal of shielding.
Magnetic shielding role is to prevent interference, low frequency magnetic field shield with high permeability, high saturation magnetic materials to absorb or loss of electromagnetic field in order to achieve the goal of shielding.
Very closely related to the influence of electromagnetic interference and distance, the nearer to the interference sources is, the bigger the interference field strength, the greater the impact.
In the electronic instruments and meters, electronic components arrangement is often restricted by volume, often with low resistance or magnetic material closed metal materials, isolating protection components or parts of the spacing is not enough, in order to reduce or prevent electrostatic or electromagnetic interference.
2, filter filter can inhibit the transmission of electromagnetic interference.
Sensitive electronic devices by the power cord, telephone line, the line of control, signal conduction electromagnetic interference signal, etc.
Low pass filter is often used to filter to conduction disturbance, can effectively inhibit.
But when in the electromagnetic compatibility design, the characteristics of filter must be considered: the frequency characteristics and impedance characteristics, rated voltage and voltage loss, rated current, the leakage current, insulation resistance, temperature, reliability, appearance, size, etc.
3, grounding in equipment or devices, grounding is the interference in order to make the equipment or device itself produces electricity flows through the ground into the earth, and generally used in the conducted interference suppression.
The ideal is a zero voltage and zero impedance grounding body physical entities, as all the signal level in the relevant circuit reference points, no don't need an electric current passes through it produces voltage drop.
This is actually the approximate ideal grounding entities.
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