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December, 2016


Using Conformal Coating to Protect Sensitive Electronics


Continued from page 46


was developed and patented by KC- Produkte. With this needle, low- to medium-viscosity dam materials can be applied with the help of optional distribution air. The curtain nozzle is similar to


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a needle valve except that an electro- pneumatic controller is used to rap- idly open and close the needle. Compressed air is applied continu- ously to a duct, which is closed by a solenoid valve. As soon as the sole- noid valve is electrically actuated, the duct is opened and the pneumat- ic pressure lifts a piston along the material needle. The material flow is then controlled as it exits the nozzle. When the electrical signal is stopped, the duct is evacuated and a spring pushes the material needle back into its seat, cutting off the flow of mate- rial. With the help of a knurled screw attached to its head, the needle’s stroke can be adjusted. The width of the curtain can be adjusted as well, from 3-20 mm (0.1-0.8 in.). The Protecto allows the selec-


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tion of desired curtain widths, and can do so automatically, so that vari- ous web widths can be implemented in the same program. The system is also able to apply material with the curtain nozzle at speeds of up to 600 mm/s (2 ft/s). This allows the system to coat very large surfaces quickly. This is also a low-spatter process, since the nozzle works without atom- izer air. This process is unsuitable for high viscosity materials, or for the coating of small and precise areas. In addition, this method cre-


ates a “shadow” where no material is applied when passing over a tall com- ponent. These areas then need to be


Rehm’s Protecto conformal coating system.


approached from the other side, or the nozzle must be brought to a standstill directly over those loca- tions to coat the area fully. Taking a close look at the PCBs


being produced and the manufactur- ing environment, along with consult- ing system specialists, simplifies the selection of a coating system. Rehm has developed its Protecto system to be highly flexible and customer-ori- ented for use in electronics manufac- turing. Contact: Rehm Thermal


Systems, LLC, 3080 Northfield Place, Suite 109, Roswell, GA 30076 % 770-442-8913 fax: 770-442-8914 E-mail: p.handler@rehm-group.com Web: www.rehm-group.com r


Reducing the PCB Bone Pile Continued from page 50


1990s. This allows a high-level con- trol of conventional instruments while JTAG Technologies also pro- vides its own library for boundary- scan activities. Microsoft’s .NET framework is


the company’s latest coding environ- ment and provides language interop- erability across several programming languages. Programs written for .NET execute in a software environ- ment known as Common Language Runtime (CLR), a virtual machine that provides security, memory man- agement and exception handling. Languages supported range from C# to VisualBasic.


Specifications and Documentation


Having previously defined a


broad test strategy it will be neces- sary to provide a detailed test speci- fication per UUT. This is especially important in cases where a third party or systems integrator is involved. Glib requests such as “Test as much as you can!” are pretty much meaningless and can provoke much future argument and contractual wrangling. The test specification will also figure in the acceptance specifi- cation of the tester along with checks for compliance with electrical safety and EMC measures. Documentation of the finished


system is another important aspect that can extend the useful life of a tester. A great many carefully engi- neered systems have been aban-


Commissioning and Maintenance


The commissioning process for a


new test system should be the same whether the equipment was developed in-house or supplied by a third party. In each case, the system must be inspected for compliance to safety specifications before it is even powered up. The UUT program can be subse- quently executed with a known good (golden) board to check for false fail- ures. If possible, a board with known failures that are covered by the tester should be run through. Limits check- ing should be fine-tuned to cover the spread of acceptable results. Maintenance is perhaps the most


neglected part of a test system. In any tester there will be consumable items that will eventually need to be replaced. Test probes, connectors and cables all have a finite lifespan and should be replaced on a schedule rather than later on when an issue arises, which leads to extra time spent tracking down the problem. Similarly, most analog measuring equipment requires periodic calibration or at the very least should be checked against a good traceable instrument. Also, easy access to tester components for replacement and service must be con- sidered at the design stage. Clearly there is a great deal to


consider before embarking on a test system build. Consider what is more


Continued on next page


doned when a lead engineer moves on from an organization without leaving adequate documentation.


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