Turn-Key Electronics board manufacturer Services for pcb printed circuit boards

Main: circuit design, components purchasing and management, PCB production, manual welding ( Or dispatching) , model, research and development board, circuit boards, double panel factory, bulk welding

by:Rigao      2020-03-22
Test method/electronic components of negative temperature coefficient thermistor ( NTC) Detection. ( 1) , measuring nominal resistance Rt of the NTC thermistor is measured with a multimeter method with common fixed resistance measurement method is the same, namely according to the nominal value of NTC thermistor to choose the appropriate electrical block can directly measure the actual value of Rt. But because of the NTC thermistor is sensitive to temperature, so the test should be paid attention to the following: A Rt is the manufacturer when the environment temperature is 25 ℃ is measured, so when using A multimeter to measure Rt, should also be carried out in ambient temperature of 25 ℃ near the end of the, to ensure the credibility of the test. B measuring power shall not exceed the specified value, so as to avoid current measurement error due to thermal effect. C, pay attention to proper operation. Test, don't hold the thermistor body with the hand, in order to prevent the human body temperature influence on the test. ( 2) , estimate temperature coefficient alpha t first measured resistance Rt1 under room temperature t1, reoccupy soldering iron as a heat source, close to the thermal resistance Rt, measured resistance RT2, at the same time using a thermometer to measure the average for the thermistor Rt surface temperature t2 to calculate again. Main: circuit design, components purchasing and management, PCB production, manual welding ( Or dispatching) , model, research and development board, batch welding, SMT processing and repair, DIP, BGA rework, testing, assembly, all the certification, etc. Electronic components is the floorboard of the components and devices. Electronic components: refers to the production process does not change when the molecular composition of the finished product. Such as resistors, capacitors and inductors. Because it does not produce electronic itself, it has no current and voltage control and transformation function, circuit boards, double panel sales, say again so passive components. Electronic devices: refers to the production and processing in the factory when change the molecular structure of the finished product. For example, transistors, electron tubes, integrated circuits. Because it is itself can produce electronic, have control, transformation function (current and voltage Amplification, switch, rectifier, detection, oscillation and modulation, etc. ) , say again so active device. According to the classification standard of electronic devices can be divided into 12 categories, can be summarized as two large vacuum electron devices and semiconductor devices. Main: circuit design, components purchasing and management, PCB production, manual welding ( Or dispatching) , model, research and development board, batch welding, double panel zhangjiagang circuit boards, SMT processing and repair, DIP, BGA rework, testing, assembly, all the certification, etc. Power transformer testing A by looking at the appearance of transformer to check whether there is obvious anomaly. Such as whether the coil wire fracture, desoldering, double panel circuit board manufacturers, insulation sear, core fastening screw loosening, silicon steel sheet of rustily, winding coil if there is leakage, etc.
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