Specifications

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.