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The function of resistors is to oppose the flow of electric current in a circuit. Therefore their primary parameter is the resistance value. The manufacturing tolerance must be adequately chosen for each specific application. The ultimate resistance value may deviate from the specification because of many reasons. As a professional resistor manufacture, Microhm Electronics is providing various kind of high quality resistors. One is the temperature coefficient of resistance, or TCR, which is often specified for precision appli...
Date：2019-11-25 [More+]
Thin film, thick film, wirewound and solidcomposition resistors offer different thermal dissipation and surge-withstand characteristics, which impact their abilities to handle overcurrent and overvoltage conditions. Microhm Electronics resistors, such as NSS series and KSW series, has superior surge handling capacity. Motor controllers used to power, stop and control the speed of a variety of motors must deal with a wide variety of surges due to switching events. When a motor starts, the current draw during the speed ramp-up ...
Date：2019-11-25 [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：2019-11-22 [More+]
Resistors are available in a large amount of different packages. Besides rectangular surface mount resistors, axial resistor and MELF packages also draw users close attention. The size of axial resistors is not as standardized as the SMD resistors and different manufacturers often use slightly different dimensions. Furthermore the size of an axial resistor depends on the power rating and the type of resistor such as carbon composition, wirewound, carbon or metal film. The following drawing and table give an indication of the ...
Date：2019-11-22 [More+]
Wirewound power resistors are usually rated with respect to continuous power, which can be insufficient for e-mobility applications. A typical application is the pre- and discharge of large capacitors, often referred to as soft start. In this case the pulse-handling capability of the resistor is also very important. This capability can be determined over a large range of pulse durations by combining theoretical basics with finite element simulations of the respective thermal performance. The results can be generalized so that...
Date：2019-11-19 [More+]
Global provider of engineered electronics for performance critical applications, Microhm Electronics, has announced the heatsink specifically designed to optimise the thermal performance of its NLR series and MVR series power resistors. Providing a combination of high surface area, cooling performance, compact dimensions and light weight, the PCB mounting heatsink is suitable for use in power supplies, power amplifiers, motor drives and inrush current control applications requiring resistors operating in the 20-100W range. H...
Date：2019-11-13 [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：2019-11-06 [More+]
Ultra-precision, high-side current sensing is crucial in applications where the correct amount of current entering or leaving the battery needs to be measured to a very high degree of precision. A layout designer and design engineer need to take to measure ultra-high precision voltage drop across a shunt resistor. These measurements are enhanced utilizing the proven Kelvin sensing methods with a four-terminal sense resistor. Microhm Electronics MVR2321-4, MVR3825-4 and MVR4618-4 are most used 4-termial Kelvin resistors. Ultra...
Date：2019-11-06 [More+]
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