1. What is a thermocouple? 1.1 Introduction to Thermocouples Thermocouple (thermocouple) is a temperature measuring element commonly used in temperature measuring instruments. It directly measures the temperature, converts the temperature signal into a thermoelectromotive force signal, and converts it into the temperature of the measured medium through an electrical instrument (secondary instrumen...
What is the LED test standard？ Semiconductor light-emitting diode (LED) is a new type of light-emitting body, with high electro-optical efficiency, small size, long life, low voltage, energy saving and environmental protection, it is an ideal lighting device for the next generation. LED photoelectric test is an important and only means to test LED photoelectric performance, and the corresponding...
In addition to producing a negative influence on the sensitive electronics that underlie the guidance and communications systems of today’s military vehicles, sand and dust may also have a negative impact on the tough exterior that serves to shield those components from harm. This test is performed in a dust test chamber or dust tester. Sand and dust testing have become an essential element ...
It is well known that color table and color rendering are two important quantities that reflect the color of light sources. Light sources with different spectral power distributions can have the same color table, but the color rendering properties of several light sources with the same color table may be completely different. Therefore, only the combination of color table and color rendering can f...
1. What are the prevention and control plans and standards for juvenile myopia? 1.1 Adolescent myopia prevention and control program: With the increasing rate of myopia among teenagers, more and more students are becoming shortsighted. In order to protect the children’s eyes and let them have a bright future. Eight ministries and commissions including the Ministry of Education and the Nation...
Let us first attempt to comprehend what the RoHS test is and why it is seen to be significant in the first place. RoHS is an abbreviation that stands for Restriction of Hazardous Substances at its core. The Directive 2002/95/EC is sometimes referred to as the 2002/95/EC. Because it is a descendant of the European Union, it is structured only to restrict the application of some hazardous substances...
1. What is a conducted disturbance test? 1.1 Introduction of conducted interference: Electromagnetic interference (EMI)-The interference signals generated by electronic devices are transmitted through wires or public power lines, and mutual interference is called conducted interference. Conducted interference has brought confusion to many electronic engineers. How to solve the conducted interferen...
The goniophotometer is mainly used to measure the light distribution performance of lamps and light sources. That is, the luminosity and chromaticity value distribution of the laser source of lamps in different directions in space. 1. What are the main types of goniophotometers and what are the test methods? 1.1 Types of goniophotometer Goniophotometers are mainly divided into two types: horizonta...
Metal components, zinc plated nuts and bolts, surface coatings, and paint may be tested for corrosion resistance in salt spray test chambers or salt fog chambers. It is possible to test the suitability of a layer for use as a protective finish on finished items in such chambers, where coated samples are placed in a simulated corrosion environment. Corrosion-resistant samples are tested for a certa...
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