barcode scanner asp.net mvc PRINTED CIRCUITS HANDBOOK in Software

Print QR-Code in Software PRINTED CIRCUITS HANDBOOK

PRINTED CIRCUITS HANDBOOK
Scan Quick Response Code In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Print QR Code JIS X 0510 In None
Using Barcode generation for Software Control to generate, create QR Code 2d barcode image in Software applications.
FIGURE 41.7
Quick Response Code Reader In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
QR Code Printer In C#.NET
Using Barcode creator for Visual Studio .NET Control to generate, create QR image in .NET applications.
Glass diode cracked by high-modulus coating.
QR Code Encoder In Visual Studio .NET
Using Barcode creator for ASP.NET Control to generate, create QR Code JIS X 0510 image in ASP.NET applications.
QR Code Creator In .NET Framework
Using Barcode encoder for Visual Studio .NET Control to generate, create QR Code 2d barcode image in .NET framework applications.
Elongation Materials with high elongation are resistant to cracking and abrasion. Reworkability AR coatings are the easiest to rework, whereas XY and ER are the hardest. Abrasion resistance This is ability of the coating to withstand damage from handling and later assembly operations, as well as in the field.
QR Code Generation In Visual Basic .NET
Using Barcode drawer for .NET Control to generate, create QR-Code image in VS .NET applications.
Generate Bar Code In None
Using Barcode generation for Software Control to generate, create barcode image in Software applications.
Areas to Mask During the design, the designer needs to consider all the areas and parts on the board that need to be uncoated and identify them on the assembly drawing, shop instructions, or other paperwork that the coating technician will use. Although it is obvious to the design engineer that an expensive infrared (IR) sensor element should not be coated, it may not be so obvious to the technician holding a drawing that says, Coat entire board, and nothing else. Being specific on the drawing clarifies what should be coated and how. Consider the following areas:
Universal Product Code Version A Creation In None
Using Barcode generation for Software Control to generate, create UPC Code image in Software applications.
Encoding Code 39 Full ASCII In None
Using Barcode maker for Software Control to generate, create Code 3/9 image in Software applications.
Coating on connector pins can cause open circuits, and may interfere with the full mating of the connector. It is necessary to mask the back of the open back connectors as well as the front, to keep the coating from flowing along the back of the pin into the active area. Also, pin alignment depends on a certain amount of looseness on the pins, and filling the connector shell with coating will defeat this feature. Coating should be kept from the edges of plug-in CCAs where the card guides travel. The coating will interfere with proper operation of the card guide and may prevent proper grounding of the card. Mounting holes for screws should be masked to keep the coating from filling or reducing the size of the hole and to ensure that the PWB is properly grounded. Test points should be masked so that they can be reliably accessed during testing. The adjustment screws of adjustable components. If the adjustable components have openings in them, the openings should be masked also.
Encode EAN / UCC - 14 In None
Using Barcode drawer for Software Control to generate, create UCC - 12 image in Software applications.
Barcode Generator In None
Using Barcode drawer for Software Control to generate, create barcode image in Software applications.
CONFORMAL COATING
Encoding EAN / UCC - 14 In None
Using Barcode printer for Software Control to generate, create GTIN - 14 image in Software applications.
Barcode Drawer In Java
Using Barcode generation for Android Control to generate, create barcode image in Android applications.
If the product contains sensors for air temperature, pressure, humidity, etc., the coating should not block the air from entering the sensor. Optical devices, light-emitting diodes (LEDs), infrared sensors, and light sensors may have their operation affected by the coating. This is especially true for UV and IR devices since the coating may be opaque to UV and IR wavelengths of light. The coating may also darken, cloud, or turn brown as it ages, eventually affecting the operation of the circuit. Connectors for fiber-optic cable should also remain clear of coating for the same reason. Components mounted in sockets should have the sockets masked and the components inserted after coating. Areas under BGA packages should not be underfilled with conformal coating but with an underfill adhesive particularly suited for that purpose. If no underfill is used, the edges of the BGA should be masked, or dammed with a permanent adhesive barrier to prevent the coating from entering under the BGA. Due to the shrinkage of conformal coating, during thermal cycling the balls will be crushed and the reliability of the BGA will be adversely affected.
GTIN - 13 Maker In Java
Using Barcode generation for BIRT reports Control to generate, create EAN-13 Supplement 5 image in BIRT applications.
Barcode Decoder In .NET Framework
Using Barcode decoder for .NET framework Control to read, scan read, scan image in Visual Studio .NET applications.
REFERENCES
GTIN - 12 Reader In .NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
Code-39 Scanner In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
1. Ritchie, B., Loctite Corporation, Process Requirements for Solvent-Free UV Conformal Coatings, Adhesives in Electronics 96, Second International Conference on Adhesive Joining and Coating Technology in Electronics Manufacturing, Stockholm, Sweden, June 1996. 2. Dow Corning, Conformal Coatings Tutorial. Dow corning Conformal Coating Tutorial is a web page: http://www.dowcorning.com/content/etronics/etronicscoat/etronics_cc_tutorial.asp. 3. Bennington, L., Conformal Coating Overview, Loctite Corporation. 1995. 4. Wu, F., and Goudie, S., IPC-HDBK-830, IPC, 2002. 5. NASA-STD-8739.1, 1999. 6. MIL-I-46058C, 1972. 7. Woodrow,T. , and Ledbury, E., Evaluation of Conformal Coatings as a Tin Whisker Mitigation Strategy, IPC/JEDEC, 2005.
Scan Code 128 Code Set A In VB.NET
Using Barcode scanner for VS .NET Control to read, scan read, scan image in .NET framework applications.
Make GS1 - 12 In Java
Using Barcode generator for Java Control to generate, create GTIN - 12 image in Java applications.
This page intentionally left blank
SOLDERABILITY TECHNOLOGY
Copyright 2008 by The McGraw-Hill Companies. Click here for terms of use.
This page intentionally left blank
SOLDERABILITY: INCOMING INSPECTION AND WETTING BALANCE TECHNIQUE
GERARD O BRIEN
S.T. and S. Company Bayport, New York
42.1 INTRODUCTION
The power of solderability testing can be lost, even to people who routinely perform solderability tests, because of the function of the test method and a lack of understanding the process. Most solderability testing has been used as a means of testing incoming components or boards in the hope of catching defects and thus avoiding line-related issues. When a defect occurs on the line it is too late. 42.1.1 Dip and Look Testing has most often used a protocol best described as dip and look, in which a technician completely immerses the wettable area of a PCB or component into a solder bath for a prescribed period of time and then evaluates the sample visually once it has cooled down. Pictorial guidelines were used to help the technician to accept or reject the samples being tested. Some incoming inspection departments may have stressed the solderable deposit by exposing it to steam for eight hours and then performed the solderability test. Steam exposure for tin lead coatings is a well documented and applicable stressing technique, but the same isn t true for Pb-free surface finishes. In all cases, the result is basically subjective and the data produced from these tests provides little information either to the process engineer responsible for the assembly line or the plating line that is applying the solderable deposit. With the exception of the very extreme it wet or it did not wet with solder which is very rare, the remaining population of results achievable are lost in dip and look testing. Plating, solderability, and soldering in the tin lead world has such a large process window that in the majority the dip and look testing suffices with defects normally in the parts per billion. The occasional disaster does occur but it is rare and attributable to an assignable cause. This process latitude and statistical process control has resulted in the demise of the incoming inspection departments at the CM or OEM. The technician who would have once performed the testing has been replaced by a clerk who only job is to reconcile the purchase order quantity with the received quantity.
Copyright © OnBarcode.com . All rights reserved.