Accurate measurement of high range resistance Many test applications require the measurement of resistivity (area resistivity and volume resistivity) of high-level materials. The traditional measurement method is to apply a high enough voltage to the sample, measure the current flowing through the sample, and then use Ohm’s Law (r = V / I) to calculate […]

# Articles Tagged: resistance

## The principle of zero line and ground line is explained in detail

Many people’s understanding of the zero line is wrong. What is the principle of the zero line and the ground line? Listen to the teacher carefully. 01 Let’s start with figure 1 There are only three phase lines L1 / L2 / L3 and the neutral line n of the three phase lines. The voltage […]

## Internal noise source of OP AMP and its optimization solution

Daniel Defoe and Benjamin Franklin once said that there are only two things in life that are certain: death and taxes; unfortunately, for people who deal with electronic products, there is another one: noise. Although electrical noise is inevitable, designers can better understand each noise source and their impact on the noise level of the […]

## What is the four wire test method of jishili multimeter and what is its main application function

Jishili source meter and multimeter are always favored by customers. In the process of using, people often ask: what is the four line test method? Today, I’d like to share with you what is the four line test method. The four wire test method is the best one to eliminate the lead resistance error (or […]

## Characteristics and application analysis of Tektronix pa1000 single phase power analyzer

Tektronix pa1000 is a single-phase, single channel power analysis solution optimized for fast, efficient and accurate power analysis in accordance with international standards. With its compact appearance, user interface similar to DMM, graphic display and powerful software, users can quickly visualize, analyze and record the power consumption efficiency of the next generation equipment, including standby […]

## Analysis of application problems and solutions of current feedback amplifier

Most current feedback (CFB) amplifiers belong to the category of high-speed amplifiers. In recent years, a large number of good application guides are mainly used to introduce the application of current feedback amplifier and the main problems encountered. Here we will summarize with a short text. The CFB amplifier has a high impedance input (non […]

## Characteristics and application of small resistance test scheme of Seth instrument

System background Resistance test is the most commonly used test method to characterize the characteristics of materials. In some applications, users need to carry out ultra low resistance test, such as nano materials, superconducting materials, relay switches, low resistance materials, connector test, or precise heat measurement and research fields. These tested devices usually have very […]

## Analysis of the basic principle and characteristics of triode oscillation circuit

For analog circuits, the necessary conditions for oscillation are (1) amplitude balance (2) phase balance (the circuit is debugged successfully) Preparatory knowledge: the voltage at both ends of the capacitor is not allowed to change suddenly (the mathematical model of the capacitor is the integral of the voltage); the series connection of the capacitor and […]

## Common problems and solutions in op amp circuit design

As an electronic engineer, operational amplifier is a very common IC. If we talk about addition circuit, subtraction circuit, multiplication circuit and exponential circuit today, I’m sorry. So, let’s talk about some details of the design today. First, how to compensate the bias current The typical circuits of inverting operational amplifiers are as follows In […]

## What are the common faults of resistance capacitance coupling multistage amplifier circuit and how to solve them

1. When the DC circuit of VT1 amplifier fails, the DC circuit of vt2 amplifier will not be affected due to the DC isolation effect of C3. However, because the first stage amplifier circuit can not work normally, it has no normal signal added to the second stage amplifier circuit. Although the second stage amplifier […]