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Ultra-Low Noise Resistors in Amplifier Applications

Ultra-Low Noise Resistors in Amplifier Applications

Ultra-low current noise resistors provide better resolution and accuracy of the amplified outputs, enabling higher performance of the end products, which is apporiate for high-gain amplifiersincluding high-quality microphones, piezoelectric sensors and X-ray security scanners, such as Microhm NTP seriese and NLR100. In audio recording applications, high-gain amplifiers boost the volume of the input that can be detected by a microphone before causing feedback, resulting in higher sound quality. For manufacturers of piezoelectr...

Date:2019-09-10      [More+]
Ammeter and Ammeter shunts

Ammeter and Ammeter shunts

An ammeter is a device designed to accurately measure and display electrical current in a readable form, which could be a moving coil meter, a LED bargraph display or a digital panel meter. The basic unit of electrical current is Amperes, usually shortened to Amps. Milliamps, is a more convenient measurement for lower power circuits When designing an ammeter, external resistors, usually referred to as shunt resistors (or sometimes current resistors), are connected in parallel with the meter input to extend or convert the rang...

Date:2019-09-05      [More+]
How to Select the Right Resistor for Harmonic Filtering?

How to Select the Right Resistor for Harmonic Filtering?

The range and complexity of electrical equipment has increased dramatically in recent years. An unwanted consequence of this rise is the creation of harmonic currents, which can cause voltage distortion and quality problems. Also known as damping resistors, harmonic filters reduce distortions in power systems, which can be produced by nonlinear loads such as arc furnaces and switch-mode power supply (SMPS). Harmonics can have adverse effects on the power supply network. If the nonlinear loads produce unwanted harmonics, they ...

Date:2019-09-04      [More+]
High Voltage Resistors for Power Supplies

High Voltage Resistors for Power Supplies

There are a vast array of power supplies on the market, and the variety of resistor applications in those designs broaden the selection dramatically. Engineers from power supplier factorys often consult high voltage resistors, like HPMRY, PMRY, EE series, MPF series from Microhm Electronics. So, for the purpose of this article, power supplies will be referred to as devices that have fixed DC outputs up to several kV. Whatever the application, power supply designers must be aware of specific regulations on safety or the enviro...

Date:2019-09-04      [More+]
Why Choose Metal Film Resistor?

Why Choose Metal Film Resistor?

Metal film leaded resistors are almost the definitive standard used these days. Cost, reliability, and availability of close tolerance product means that they are almost universally used for general purpose leaded resistor, HPMRY series, PMRY series, EE series, NLT series from Microhm Electronics are your best options when choosing metail film resistors. Another advantage of metal film resistors is that they generate low levels of noise as a result of their construction and technology. Offering a high tolerance as well as pro...

Date:2019-09-02      [More+]
How to Regulate DC Power With Resistors

How to Regulate DC Power With Resistors

Current flows through circuits when a voltage is applied to them. One way to limit this flow is with a resistor. Precision resistors, power resistors and shunt resistors are ready in Microhm Electronics for engineers option. How well resistors oppose current flow depends on their resistance. Ordinary resistors obey Ohms Law, where the voltage, V, is equal to the current, I, multiplied by the resistance, R. Resistors can be tested in and out of circuit by measuring their resistance. They may be tested in circuit by measuring t...

Date:2019-08-30      [More+]
Calibration Resistors to Inspect the Measuring Accuracy

Calibration Resistors to Inspect the Measuring Accuracy

Besides the corresponding precise calibration measuring devices also precise calibration resistors are required for the calibration of testers. These calibration resistors, like Microhm Electronics MVR2321-4, MVR3825-4, MVR4618-4 and NSR, serve to let certain test currents flow at various test methods and test voltages. In doing so it is tested to what extent the measured voltage and current values indicated by the tester to be calibrated correspond to the measured values of an external measuring device. Minor deviations with...

Date:2019-08-27      [More+]
Resistor Properties Brief

Resistor Properties Brief

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. One is the temperature coefficient of resistance, or TCR, which is often specified for precision applications. Stability defines the long term variations of the resistance. After a long duration of electric load, th...

Date:2019-08-26      [More+]
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