Technetters,
Under the Visual Examination para in IPC-600, IPC-6012, & IPC-6013 reference is made to "1.75x magnification (approx. 3 diopters)". Do any IPC or other Internationally recognized standards list the formula for determining magnification or a table of magnification vs. diopter? When I talked to my vendors and distributors about this topic almost all of them had a different theory and or method for calculating magnification. 

Under the Visual Examination para in IPC-610, as the size of the feature being inspected is reduced in size, the magnification increases. One of the magnification powers called out is 4X. Our stereo-microscopes start at 7X or 10X and we do not want to use pocket comparators or jewelers eye loops to perform inspection operations. Does anyone know where 4X halo lamps can be purchased? 

Does anyone know of a way to confirm the magnification of a standard Halo lamp? 

Vendor references can be sent to
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Any and all assitance with this issue is greatly appreciated.

Sheila Akins

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