SYMBOL VERIFICATION OVERVIEW
2
Grid Non-Uniformity (GNU)
qualifies the module placement by comparing to a nominal evenly spaced grid.
Minimum Reflectance (MR)
The image brightness is adjusted on a reference part, after which this calibrated value is compared
with the reflectance of that part. MR is the ratio of the parts reflectance to the calibrated reflectance
Print Growth
Measures the the deviation of actual elements dimension from the expected element
dimension due to printing problems (i.e. overprint or underprint).
Underprinting Overprinting
Unused Error Correction (UEC)
This parameter tests and grade the extent to which regional or spot damage in the symbol
has eroded the information redundancy margin that error correction provides.
100% Unused Error Correction Capacity is the ideal condition.
Y
X
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