How are the filters “Sample 260 nm” and “Sample 280 nm” differentiated from the “Sample A1”, “Sample A2” and “Sample A3” filters of the Secondary UV-VIS-Filter set?
The 260 nm and 280 nm filter samples are for the testing of the wavelength accuracy, the A1, A2 and A3 filter samples for testing of the photometric accuracy (systematic and random error) of all wavelengths. The values measured with these filters must lie within the given limits. The limiting values are contained in a table found on the inside of the lid of the filter box.
