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In a 4-terminal resistor, an ultra-precise resistor (green) is connected to 4 terminals through small, but unknown, resistors (red). These unknown resistors are the combination of lead resistance, screw terminal resistance, connection wire resistance, and other sources of errors. Typical values for these unknown resistors range from 0.01 ohms to 0.2 ohms, and the values are often unstable. The values can change when you loosen or tighten a screw, for example, or if you substitute a longer test lead. To use a 4-terminal resist...
Date：2019-08-22 [More+]
Thin and thick film resistors are the most common types in the market. They are characterized by a resistive layer on a ceramic base. Although their appearance might be very similar, their properties and manufacturing process are very different. The naming originates from the different layer thicknesses. Thin film has a thickness in the order of 0.1 micrometer or smaller, while thick film is around thousands time thicker. However, the main difference is method the resistive film is applied onto the substrate. Thin film resist...
Date：2019-08-20 [More+]
In high-end audio equipment, careful selection of resistors is one of the best ways to avoid or minimize noise and distortion in the signal path. Noise is an unwanted wide spectrum signal that may be superimposed on any useful signal, including DC. Resistors, like other passive components, are noise sources to various degrees, depending upon resistance value, temperature, applied voltage, and resistor type. Microhm Electronics manufactures varied resistors, including below mentioned thin film resistors, thick film resistors, ...
Date：2019-08-20 [More+]
Metal film resistors have a thin metal layer as resistive element on a non-conducting body. They are amongst the most common types of axial resistors. Microhms metal film resistors consist of PMRY series, MCC series and more. Other film type resistors are carbon film and thick and thin film resistors. In most literature referrals to metal film, usually it is a cylindrical axial resistor. However, thin film chip resistors use the same manufacturing principle for the metal layer. The appearance of metal film resistors is simila...
Date：2019-08-14 [More+]
A device to measure electric current is called an ammeter. Most modern ammeters measure the voltage drop over a precision resistor with a known resistance. The current flow is calculated by using Ohms law: Ohms Law I=V/R. Most ammeters have an inbuilt resistor to measure the current. However, when the current is too high for the ammeter, a different setup is required. The solution is to place the ammeter in parallel with an accurate shunt resistor. Another term that is sometimes used for this type of resistor is ammeter shunt...
Date：2019-08-14 [More+]
There are various basic electrical and electronic components which are commonly found in different circuits of peripherals. In many circuits, these components are used to build the circuit, which are classified into two categories such as active components and passive components. Active components are nothing but the components that supply and control energy. Passive components can be defined as the components that respond to the flow of electrical energy and can dissipates or store energy. These components can be found in nu...
Date：2019-08-13 [More+]
A current limiting resistor is the one used to reduce the current present in a circuit. A simple example is a resistor in series with a LED. You would usually want to have a current limiting resistor in series with the LED to control the amount of current flowing through it, else the LED will burn due to it exceeding its current limit. Microhm Electronics shunt resistors, like MMS2512, can be used for this application. Pull-up resistors are resistors commonly used in logic circuits to help ensure a well-defined logical level ...
Date：2019-08-12 [More+]
When considering resistors, resistance is not the only important thing to think about. Like any other component there are a number of important things to consider. Microhm Electronics recommend resistors according to the resistance, tolerance, power, TCR, size and type demanded mainly. Frequency Response is also one of the key parameters to consider in certain special application, like radio frequency (RF). Ideally, resistors should act as pure resistors, without any of the characteristics of other types of component and whe...
Date：2019-08-09 [More+]
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