Filter certification
QA/QC testing by EMS of the filters at an interval of not more than 6 months is recommended. Filter
certification, replacement or additional Neutral Density Filters are available from EMS.
EMS Neutral Density Filters for Micro-turn 200 are calibrated on a Perkin-Elmer Lambda Series 6 / PECSS
Spectrophotometer per Federal Environmental Protection Agency specifications. These specifications are
contained in the Code of Federal Regulations 40 CFR 60, Appendix B, Performance Specification 1, Attenuator
Calibration. The filters are scanned over the visible region from 380 to 780 nanometers in one nanometer steps
and the resulting transmittances of the filter are weighted to the Source C Human Eye Response by multiplying
each value by its associated response factor. The corrected values of transmittance are converted to % Opacity
and the value is recorded on the filter and associated chart.
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