1. Method errors
It refers to the error caused by the imperfect measurement method used, the theoretical basis is not rigorous, and the error caused by the improper modification and simplification of some classical measurement methods, that is, all the factors that are not reflected in the expression of the measurement results, and in fact these factors play a role, which is also called theoretical error.
2. Instrument, meter error
Errors introduced by the instrument, the meter itself and its accessories, due to imperfection in the electrical or mechanical properties of the instrument. For example, the standard resistors in the bridge, the probe line of the oscilloscope, etc., all contain errors. Errors caused by the zero offset of the instrument and meter, the inaccurate scale, and the nonlinearity are all instrument errors.
3. Personal error
Errors caused by limitations of the human sensory and motor organs. For some measurements that require the help of the human eye and human ear to judge the results, as well as measurements that require manual adjustment, human error will be introduced. For example: mispronouncing the scale, mispronouncing the reading, etc.
4. Error in use
Also known as operation error, it refers to the error caused by improper installation, adjustment, arrangement and use in the process of using the instrument. For example, the instrument that should be placed vertically according to the regulations is placed horizontally, the instrument is poorly grounded, the loss caused by the test lead is too long or the impedance matching is not considered, and the measurement is not carried out without preheating, adjustment and correction according to the operating procedures, etc., will produce use errors.
5. Impact error
Also known as environmental error, it refers to the additional error caused by the influence of temperature, humidity, air pressure, electromagnetic field, mechanical vibration, sound, light, radioactivity, etc.
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How do I initialize parameters?
Set H03 to 1, the parameter can be initialized, and the STOP button + UP button are required for dual key operation.
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Consideration of CO2 emission reduction and progress towards a carbon-free society
Shanghai has issued a red high temperature warning for several days, and the temperature of 40.9°C has tied the highest record since 1873. The root cause of the continuous high temperature and heat wave events in many places in the northern hemisphere is believed to be the global warming trend.
Global warming is happening at an unprecedented rate, and several ...
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How to use Fuji Electric inverter
Fuji Electric inverter has many precautions during use. Here are some methods to learn.
The ambient temperature has a great influence on the service life of the inverter. For every 10°C, the service life of the inverter will be halved, so the ambient temperature and inverter dissipation must be solved.
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Irrigation area remote monitoring water flow operation management scheme Fujifilm ultrasonic flowmeter application
In order to solve the problems of inaccurate metering and billing, difficult collection of water charges, and serious waste of water resources in agricultural irrigation water, modern automatic control, radio frequency triggering and other technologies are used to achieve the goal of paying the fee before using water, charging according to the quantity, automatic metering, and automatic opening and closing of the pump.
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Fuji Electric Corporation has set sustainability goals with the aim of contributing to the realization of a sustainable society and the 2050 Environmental Vision
Fuji Electric Corporation (hereinafter referred to as "FE"), headquartered in Tokyo, Japan, under the leadership of President Mitsuhiro Kitazawa, is pleased to announce that it has established development goals*1 aimed at achieving a sustainable society, as well as a new policy called Environmental Vision 2050.
*1: Sustainability Goals...
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Fuji Electric exhibited at PCIM Asia
On June 28, 2016, the three-day Shanghai International Power Components and Renewable Energy Management Exhibition (PCIM Asia) was grandly opened at the Shanghai World Expo Exhibition & Convention Center. Focusing on renewable energy technology, Fuji Electric (China) Co., Ltd. brought new products "Four Beauties" to the exhibition, which were Fuji ...
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How is data protection carried out? - Fuji Electric inverter
Set F00 to 1 for data protection, which requires the STOP button + RISE button to operate.
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Fuji Electric high-efficiency, energy-saving, safe medium frequency induction furnace
Since 1963, we have produced more than 2,000 induction furnaces, including: 85T/60T groove type induction furnace for cast iron, 40T crucible type induction furnace for cast iron, 60T copper alloy crucible type induction furnace and other largest product records in Japan, the largest market share in Japan.
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There are always answers to common questions about the use of inverters and transmissions, there are always things you don't know
1. Why is the leakage circuit breaker easy to trip when using the inverter?
This is because the output waveform of the inverter contains higher harmonics, and the motor and the cable between the inverter and the motor will generate a leakage current, which is much larger than that when the motor is driven by the power frequency.
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What are the self-protection functions of Fuji Electric - inverter?
After years of development, the inverter (VFD) has begun to transition from a purely industrial product to a civilian field. The use of VFD can be said to have gone to the countryside, (constant pressure water supply) penetrated into thousands of households (inverter air conditioning). But after using it for a while, you will find that the failure rate of VFD is much higher than that of the average household ...
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Fuji Electric – How do you determine the breaking capacity of a circuit breaker?
(1) Is there a difference between ICU and ICS in the sample?
(2) What is breaking capacity? How do I choose a breaking capacity?
(3) Why must the circuit breaker use 0.8-0.9 times the rated current value?
(4) How to determine the sensitivity current value?
(5) The insulation space of the circuit breaker must exist ...
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The Water Resources Bureau uses Fuji imported portable ultrasonic flowmeter for measurement
At present, the measurement of production water of enterprises is mostly the on-site installation of electromagnetic flowmeters or fixed ultrasonic flowmeters by local water conservancy bureaus as the measurement eyes, and they always keep an eye on the water used by enterprises to protect the use of public resources and eliminate waste.
In stationary electromagnetic flowmeters or stationary ultrasonic flowmeters ...
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The normal selection and capacity matching of the inverter is actually very important!
In addition, it is unscientific to select the inverter body alone, without considering whether the inverter selection and capacity matching are appropriate. This will be covered in the following article
1. According to ...
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Fuji Electric joined hands with students from Zhejiang University to carry out environmental protection activities on road surfaces in Hangzhou
Fuji Electric's CSR can be seen as the implementation of the "Management Philosophy" and "Management Policy", which means that through energy and environmental business, we contribute to the resolution of social issues, maximize the positive impact of corporate activities on society and the environment as a whole, and prevent or reduce negative impacts.
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Analysis of common causes and preventive measures of inverter failures - Fuji Electric
1. Analysis of common faults in the main circuit
The main circuit is mainly composed of three-phase or single-phase rectifier bridges, smoothing capacitors, filter capacitors, IPM inverter bridges, current limiting resistors, contactors and other components. Many of these common faults* are caused by electrolytic capacitors. The life of an electrolytic capacitor is mainly determined by the ...
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City water company, the contradiction of "supply and demand", how to solve the Fujifilm portable flowmeter application
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The 10th China-Japan Energy Conservation and Environmental Protection Forum was held in Beijing, and Fuji Electric participated in the meeting and signed two cooperation projects.
On November 26, the 10th China-Japan Energy Conservation and Environmental Protection Comprehensive Forum, jointly sponsored by the National Development and Reform Commission, the Ministry of Commerce, the Ministry of Economy, Trade and Industry of Japan, and the Japan-China Economic Association, was held in Beijing. Xu Shaoshi, Director of the National Development and Reform Commission, Gao Yan, Vice Minister of Commerce, Minister of Economy, Trade and Industry of Japan ...
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Focusing on intelligent manufacturing, the Fuji Electric Technology Exchange Conference in South China has set off another boom
On June 26, the "2019 South China Fuji Electric System Products Intelligent Manufacturing Technology Exchange Conference" jointly sponsored by Fuji Electric (China) Co., Ltd., China Transmission Network and China Motion Control Industry Alliance was held in the boutique exhibition area of China Motion Control Industry Alliance at the South China Automation Exhibition (Shenzhen Convention and Exhibition).
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The solution to the problem of inverter interference – Fuji Electric
A common phenomenon of frequency converter interference
1. As soon as the inverter of the heat exchange station is opened, the pressure transmitter jumps randomly;
2. In the water supply controlled by the inverter, the pressure transformer is used as the signal to collect the pressure, and the pressure transformer is interfered by the inverter;
3. When the inverter starts the motor, the voltage transformer signal is unstable and beats badly;
4. ...
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Fuji inverter - what is the role of frequency conversion speed regulation technology in the field of energy conservation and environmental protection?
The frequency conversion speed regulation function of the inverter (hereinafter referred to as -VFD) is to convert the three-phase power frequency (50Hz) AC power supply (or any power supply) into a three-phase AC power supply with adjustable voltage and frequency. Frequency conversion speed control device can also be sometimes called VVVF, which is mainly used to adjust AC motors (asynchronous or synchronous machines).
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