Riigi sekundaarset valgusetaloni säilitatakse riigi metroloogialaboris ja laboratoorseid sekundaarseid valgusetalone hoitakse fotomeetrilistes laborites.
Good to know
Sekundaarse valgusetalonina võib kasutada isekalibreerivat detektorit.
National secondary photometric standards are maintained at national physical laboratories and laboratory secondary photometric standards are maintained at other photometric laboratories.
Good to know
A self-calibrated detector may be used to derive a secondary photometric standard.
