Gastric lavage machine pcb board
PCB reverse thrust schematic diagram, also known as PCB return schematic diagram, PCB schematic reverse thrust, PCB reverse draw schematic or reverse schematic design; it refers to the reverse derivation of products based on existing PCB circuit board physical or PCB files The schematic diagram is used to facilitate the technical analysis of the product and assist in the production or improvement of the later product prototype. This circuit diagram is also used to analyze the functional characteristics of the product itself.
Whether used to analyze board principles and product operating characteristics in reverse studies, or to be reused as the basis and basis for PCB design in forward design, PCB schematics have a special role. Moreover, it plays an indispensable role in the commissioning, maintenance and improvement of the product.
AD generates the component library through the PCB. The PCB library is built. Under the PCB library interface, there is a choice on the left side. In the lower right corner, select PCB "PCB library" and change the library package. The same PCB is concentrated in this library in the PCB interface Design"make PCB library.
How to measure pcb in allegro? MEASURE under ISPLAY is fine. When measuring, pay attention to the options on the right panel. Select Cline segs to measure the traces, and select shapes for the copper.
How does the PCB in Altium Designer 6.9 be converted to Protel99se? No matter what version of AD you have, just save it as Save As, select the lowest version (the software will prompt you to choose which saved version) 4.0 or 5.0.
The purpose of the immersion gold process is to deposit a nickel-gold coating with stable color, good brightness, smooth plating and good solderability on the surface of the printed circuit board. It can be basically divided into four stages: pre-treatment (deoiling, micro-etching, activation, post-dipping), sinking nickel, sinking gold, post-treatment (waste gold washing, DI washing, drying). When you need to make a button board, or a socket, you may need to sink gold. The board of the gold is not easy to rust and the contact resistance is small.
The Electronic Industry Association Standard IPC's mission is to serve the printed board and electronic assembly industry, its users and suppliers, and printed circuit exhibitions.
IPC's activities include: technical seminars, market research and statistics, standards and norms, workshops, qualification training and certification.
Among them, the standard specification for the manufacture of printed circuit boards and their assembly is particularly prominent in the industry standard.
In the PCB is a pad, this should be left in order to make the PCB.
Test the PCBA test pad for the test probe. For example, there are many such pads next to some of the plugs. Simply put, it is a separate component in the schematic.
The FDA requires the factory to pass 13485, our finished assembly plant is 13485, but the PCBA is outbound, and this outsourcing factory must also be 13485?
ISO13485 is an international quality management system certification.
At present, the US FDA certification does not require ISO13485 system certification. Products exported to the United States must be officially registered by the US FDA. Many medical devices that export to the EU for CE certification are required to carry out ISO13485 system certification.
The FDA is the US Food and Drug Administration. It is a medical device manufacturer and it is necessary to conduct product-related testing. It is a law enforcement agency.
When the PADS builds a component to distribute the PCB package, what is the problem with the package style?
When building the component library, of course, it will not be displayed. The PCBA package is allocated (a variety of can be allocated). After using this component, you can see the PCB package. You have not allocated the PCB package to this component! Re-edit the components in the component library in the pads logic.
Follow-up: This is not a package of a component, directly open the package library, all the packages are invisible, the previous library has an established package.
Charging: Enter "*" (an asterisk) in the "Filter Condition" and click Apply to complete it
What tools are required for PCB PCBA incoming inspection?
Function and appearance, pressure resistance and function, so you need to use vernier calipers, multimeters, CHORMAR8000 and other equipment and guest fixtures.
If you want to test tin, you need to go to the wave front welding or reflow soldering furnace to do the test tin plate, pressure tester, electronic load machine, power meter.
The PCBA incoming material detects the withstand voltage, so a pressure tester is required.
PCB incoming inspection requires inspection of the apparent dimensions.
The current test methods mainly have the following five types:
1, manual visual testing
Manual visual testing confirms component placement on the PCB through human vision and comparison. This technique is one of the most widely used online testing methods. But as production increases and boards and components shrink, this approach is becoming less and less applicable. Low pre-costs and no test fixtures are its main advantages; at the same time, high long-term costs, discontinuous defect detection, data collection difficulties, no electrical testing and visual limitations are also major drawbacks of this approach.
2. Automated Optical Inspection (AOI)
This test method, also known as automatic vision test, is usually used before and after reflow. It is a relatively new method to confirm manufacturing defects. It is better to check the polarity of components and the presence or absence of components. It is a non-electric, fixtureless online technology. Its main advantages are easy to follow diagnostics, easy to develop programs and no fixtures; the main drawback is poor recognition of short circuits and not electrical testing.
3, functional test (Functional Test)
Functional testing is the earliest automatic testing principle. It is the basic testing method for a specific PCB or a specific unit. It can be done with various testing equipment. Functional tests mainly include the Final Product Test and the Hot Mock-up.
4, flying needle tester (Flying-Probe Tester)
The flying probe tester, also known as the probe tester, is also a commonly used test method. It has been widely welcomed in the past few years due to advances in mechanical precision, speed and reliability. In addition, flying needle testing is now the best choice for prototype manufacturing, low-volume manufacturing, and the need for fast-switching, fixture-free test systems. The main advantage of the flying probe tester is that it is the fastest Time To Market tool, automatic generation test, no fixture cost, good diagnostics and easy programming.
5, Manufacturing Defect Analyzer (MDA)
MDA is a good tool for diagnosing manufacturing defects in high-yield/low-mix environments. The main advantages of this test method are low initial cost, high output, easy to follow diagnosis and fast complete short circuit and open circuit test. The main disadvantage is that functional test cannot be performed. Usually there is no test coverage indication, fixture must be used, and test cost is high. .
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