Technical Library | 2019-11-07 08:59:14.0
Inductors realized with high permeable MnZn ferrite require, unlike iron-powder cores with an inherent dis-tributed gap, a discrete air gap in the magnetic circuit to prevent saturation of the core material and/or tune the inductance value. This large discrete gap can be divided into several partial gaps in order to reduce the air gap stray field and consequently the proximity losses in the winding. The multi-gap core, realized by stacking several thin ferrite plates and inserting a non-magnetic spacer material between the plates, however, exhibits a substan-tial increase in core losses which cannot be explained from the intrinsic properties of the ferrite. In this paper, a comprehensive overview of the scientific literature regarding machining induced core losses in ferrite, dating back to the early 1970s, is provided which suggests that the observed excess core losses could be attributed to a deterioration of ferrite properties in the surface layer of the plates caused by mechanical stress exerted during machining.
Technical Library | 2021-12-06 03:43:31.0
By potting under vacuum, components can be optimally protected from external influences. Before the potting process, air and moisture are removed from the components by vacuum. Components with geometries that are difficult to vent, coils, transformers or wound goods can be potting free of air bubbles. Potting under vacuum guarantees an even distribution of the potting material.Whatsapp 0086 134 2516 4065
Technical Library | 2021-05-06 13:45:49.0
The high-sensitive micro eddy-current testing (ECT) probe composed of planar meander coil as an exciter and spin-valve giant magneto-resistance (SV-GMR) sensor as a magnetic sensor for bare printed circuit board (PCB) inspection is proposed in this paper. The high-sensitive micro ECT probe detects the magnetic field distribution on the bare PCB and the image processing technique analyzes output signal achieved from the ECT probe to exhibit and to identify the defects occurred on the PCB conductor. The inspection results of the bare PCB model show that the proposed ECT probe with the image processing technique can be applied to bare PCB inspection. Furthermore, the signal variations are investigated to prove the possibility of applying the proposed ECT probe to inspect the high-density PCB that PCB conductor width and gap are less than 100 μm.
Technical Library | 2017-06-22 17:11:53.0
C-mode scanning acoustic microscopy (C-SAM) is a non-destructive inspection technique showing the internal features of a specimen by ultrasound. The C-SAM is the preferred method for finding “air gaps” such as delamination, cracks, voids, and porosity. This paper presents evaluations performed on various advanced packages/assemblies especially flip-chip die version of ball grid array/column grid array (BGA/CGA) using C-SAM equipment. For comparison, representative x-ray images of the assemblies were also gathered to show key defect detection features of the two non-destructive techniques.
Technical Library | 2019-11-13 02:09:44.0
Dry oven is a must instrument almost for every laboratory in different industries,with nearly 20 years efforts and innovation,Climatest now masters core technique of dry oven manufacturing,no matter on temperature uniformity or temperature stability.Behind the quality is 15 years of consistent persistence,strong belief in excellence; from design to R & D to production, from promotion to sales to installation; every step should reach excellence,What you see, you use our products, you choose, you feel that we do our best,this is our faith. Dry Ovens are used to dry or temper electronic components,material tests,torrefaction, wax-melting ,high temperature aging ,preheating and sterilization in industrial and mining enterprises, laboratories and scientific research institutes. .Exterior chamber is made by reinforced steel with painting; working chamber made by anti-corrosion stainless steel SUS#304 .Intelligent PID control, LED controller with over-temperature alarm,timing range within 0~9999min .Hot air circulation system composed of Germany imported low-noisy air blower and optimal air duct which ensure uniform temperature distribution .Double layers of glass door, large transparent window to observe specimen .Forced air convection Climatest manufactures desktop and floor-standing models with RT+10°C-200°C,250°C,300°C,350°C,400°C temperature range,and customized as per special requirement,if you wanna know more details about our dry oven,please visit our product page:https://climatechambers.com/industrial-dry-oven/200-degree-c-hot-air-oven.html
Technical Library | 2012-12-26 20:18:50.0
①Single side The basic flexible printed circuit board is used of substrate of single side pcb materials and coated coverlay after finishing printed. ②Double sided That is made of substrates of double sided printed circuit board with double surface coated coverlays after finishing printed. ③Single copper foil with double coverlays Single copper foil coated different coverlays with double surface after finishing printed. ④Air gap Laminating two single printed circuit board together with no glue and bare design to meet high flexibility requirements. ⑤Multilayer That is designed for three and above circuit layers by laminating single side printed circuit board or double sided printed circuit board. ⑥COF IC chips and electronic components are installed on the flexible circuit board directly. ⑦Rigid-Flexible PCB Combined to rigid PCB with supporting and flexible PCB with high flexibility.
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