{"tema_id":"1691","string":"secondary standard           #00160","created":"2022-12-19 09:13:39","code":null,"notes":[{"@type":"Scope note","@lang":"en-EN","@value":"Most instrument calibrations are performed using secondary standards. "},{"@type":"Cataloger's note","@lang":"en-EN","@value":"reference: D022:1991 3.15 "},{"@type":"Cataloger's note","@lang":"en-EN","@value":"ID: 00160 "},{"@type":"Definition note","@lang":"en-EN","@value":"a measurement standard whose value is fixed by direct comparison with a primary standard "}]}