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Say, for example, that you use a microwave in your house. The microwave can affect the wireless LAN and Bluetooth connections and cause some problems. It is a case where the microwave is causing electromagnetic interference to devices via wireless LAN or Bluetooth.
Similar cases are found when a vacuum cleaner or hair dryer is used near the TV. Many forms of electromagnetic interference may prevent regular operation. The EMC measure ensures that a variety of different items of electronic equipment can operate nearby without causing any undue interference.
In other words, the EMC has compatibility to suppress noise emissions as well as immunity to noise.
The Electromagnetic Interference, also known as emissions, is related to the noise generated by electronic equipment and components during operation. And Electromagnetic Susceptibility or EMS refers to the sensitivity of electromagnetic equipment and components to noise during operation, also called immunity.
Nowadays, many things are electronic, and many wirelessly connected electronic devices operate simultaneously. EMC is of increasing importance.

The arc dischrage has two methods: hot cathode arc discharge and cold cathode arc discharge. The hot cathode arc discharge occurs under the cathode is heated and emits thermal electrons.
Hot cathode arc discharge is used to generate plasma for fluorescent lamps, xenon lamps, metal hydride lamps, mercury lamps, and other light sources, as well as thermal plasma and plasma torches.
In cold cathode arc discharge, on the other hand, electrons are directly emitted by a very strong electric field on the cathode surface. A different discharge phenomenon, glow discharge, is used for cold cathode discharge lamps (CCFLs).

Fluorescent lights are the most typical applications in arc discharge. The heat electrons emit and collide with mercury electrons inside the fluorescent tube, generating ultraviolet light. Then, the phosphor-coated inside the tube is emitted by the ultraviolet.
The arc discharge is also used in metal processing, such as arc welding and electrical discharge machining, while it involves many risks because of its high temperatures. Matsusada Precision offers arc discharge solutions and high voltage power supplies to prevent unwanted arc discharge.

When used in high-voltage power circuits, the isolation prevents equipment malfunctions and electric shock to users due to current surges, etc. In high-speed and long-distance communications, it prevents noise generation due to ground loops by connecting the grounds of each communication point.

The isolation system is mostly used in programmable power supplies or motor control system, industrial sensors and various interfaces, and measurement devices. Isolators have certain important parameters to select: power supply current, input signal current, and ranges of power supply and signal voltage. Creepage distance and spatial distance are also important in parameters.
The isolation system comprises of isolation amplifiers, digital isolators, optical isolators, photocouplers, transformers, coils, and other devices. They are to follow individual standards depending on the applications in various areas of industry, information technology, medication, home, measurement, control, and telecommunication.

In AC circuits, however, not only resistors, but also coils, capacitors, and the circuit itself act like resistors to block current.
As for a coil, if the voltage is constant, the current is also constant. However, when the voltage is not constant, electromagnetic induction tries to oppose the change, resulting in a phenomenon that interferes with the current. Because of it, the coil will be an impedance.

Thus, things that interfere with current in an AC circuit are all regarded as impedance.
Impedance has the property of resistance. It does not change the values by the frequency of electrical resistance. On the other hand, reactance is the property that changes values with frequency. The use of self and mutual impedances in a circuit that could cause equipment malfunction requires particular attention.

For example, a washing machine has presetting modes selectable in advance and proceeds with washing, rinsing, and dehydration in specific methods. This is unlike an air conditioner that keeps the room temperature constant and controls the operation by feedback based on information sent from the sensor.
A washing machine is not controlled by feedback but performs in a series of predetermined operation modes, which is some kind of a sequence control.

For developing advanced solutions and flexibility of the production system, Matsusada Precision provides a broad lineup of programmable DC power supplies, Bipolar amplifiers, and DC electronic loads employing effective sequential programs; pulse sequence, ramp sequence, step control, and other programs. Furthermore, Matsusada's products are suited to your various purposes and applications, including models featuring advanced program functions with detailed output patterns and complex sequence settings without a computer.

Saturated water vapor amount in the air changes with temperature. Even if the amount of moisture in the air is the same, the relative humidity also changes as the temperature changes.
Another way to measure humidity is Absolute humidity. It represents the water vapor in the air regardless of temperature. It is expressed as grams cubic meter of air (g/m³). If the amount of moisture in the air does not change, absolute humidity will not change with changes in temperature.

Relative humidity is widely used to describe the environment in daily life and manufacturing and inspection areas of products. Absolute humidity is not commonly used since relative humidity affects how we feel the temperature.
During product manufacturing, Condensation on the products could affect quality. Using relative humidity is easy to maintain the optimal environment where condensation is less likely to occur.
Generally, relative humidity between 45 to 50 percent feels comfortable for electronic equipment usage. If the humidity is too high, the possibility of condensation increases, and if it is too low, the possibility of static electricity increases.

For example, a circuit with a DC motor is modeled using the equivalent circuit with resistance, inductance, mechanical elements to friction, etc. Thus, you can obtain information on the voltage/current characteristics similar to those of the motor.
Using an LCR meter that measures Inductance (l), Capacitance (C), and Resistance (R), all the parameters of the equivalent circuit model can be calculated in a "series" or "parallel" circuit" depending upon capacitance, inductance, or resistance.

The equivalent circuit helps secure better solutions to your measurement application by simplifying complex objects under certain conditions to make it easier to observe phenomena.
The equivalent circuit can also simulate things that are not electric circuits, such as mechanical vibrations. Therefore, it is available in various analysis fields, including impedance models of living organisms.

At turn-on, a high current exceeding the rated value flows through the circuit immediately, reaching the peak current value. The current value then drops and gradually converges to the rated current value. The inrush current may put a lot of stress on the circuit and be regarded as an overload or short circuit. In some cases, it may cause the breaker to trip or the voltage to drop, and shut down the equipment connected.

Inrush currents could cause by several reasons. In the case of equipment with capacitors, a high current may flow because the capacitors must first be charged. Regarding the devices with filaments, as the resistance of the filament is low before heating the filament, there is highly possible the current flowing gets very high.

Matsusada Precision provides a broad product lineup of power supplies to protect the circuit from the inrush current occurrence. Also, our products are available to support supply power while adjusting to operating within their ratings.

Pulses are used to control stepping motors and servo motors, as well as to signal CDs and DVDs.
Matsusada Precision offers SK series, AMP series, AP series, and a broad lineup of high voltage amplifiers that can supply high-voltage pulses. Our high voltage amplifiers are suited for various applications such as beam deflection, corona discharge, and dielectric strength testing, in addition to solar cell panel evaluation and piezo drivers.
Note that, however, pulse signals can be a source of noise because the power supply is repeatedly turned on and off. When you use some models in Japan, they apply to "High-frequency use equipment" depending on the output device of high voltage pulses. The products require a license for use from the Minister of Internal Affairs and Communications under the provisions of Article 100 of the Radio Law. The requirement applies to use in Japan. Please follow the laws of the country or region as of usage.
Before installation, confirm the necessary parameters and also requirements of the high-frequency use equipment facility.