Verotec customises 19in rack cases for BBC NICAM Codec
06 May 2015
BBC Research and Development has been working to improve the performance of the widely-used NICAM Codec, and has been supported in this effort by Verotec with the supply of customised, EMC–screened, 3U 19in rack cases.
The standard unit included a four-ink CMYK digitally printed front panel, which enabled a very subtle image with more than 64,000 different colours
The modifications to the standard unit included a four-ink CMYK digitally printed front panel, which enabled a very subtle image with more than 64,000 different colours to be faithfully reproduced across the complete surface of the panel, without any margins being needed around the periphery.
A very dense pattern of connector cutouts was required on the rear panel; these were laser cut to maintain the flatness of the panel (this would have been an issue if the more usual punching had been employed). A ventilation aperture was required in each side panel, so these were created using an EMC-compliant hole pattern to minimise any reduction in the attenuation performance.
Given the application, good EMC performance was a key design consideration, and one that was easily achieved by the Veroshield rack case, which provides typical attenuation figures in excess of 110dB at frequencies up to 10MHz, and falling linearly to 40dB at 1GHz.
Veroshield is constructed from 0.9mm zinc plated steel to maintain electrical conductivity throughout the unit; an additional 19in aluminium front panel, external to the screened enclosure, is provided to improve the appearance when the unit is mounted in a rack or desktop case.
Removable top and bottom covers facilitate easy access to the internal components; they are secured with multiple fixings around their periphery to ensure that slot lengths are kept to a minimum to preserve the high levels of attenuation achievable with this case.
Verotec uses ArtCAM Express middleware in conjunction with its CAD systems, which allows customers to send ProEngineer, Solid Works, AutoCAD or PDF files of their modified panels; these drawings are then automatically translated into the standard MCR file format required to control the CNC manufacturing machines, thus avoiding any potential inaccuracies.
A further benefit is that the data path from customer to machining centre is homogeneous, ensuring that ISO9001 traceability is preserved to allow batch traceability if required.
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