This standard establis es the methods and means of verification of single-ray and double-ray photoelectric colorimeters model FEK-MT, FEK-56 with "magic eye" or with galvanometer, FEK-60, K0O all of the USSR; 581 of the RPCH and others in a measurement range from 0 to 100% transmittance
NC 90-13-07-1984 history
1984NC 90-13-07-1984 Metrological Assurance. Photoelectric Coiorimeters. Verification Methods and Means