{"tema_id":"1269","string":"noise           #01480","created":"2022-12-19 09:13:36","code":null,"modified":"2022-12-19 13:51:31","notes":[{"@type":"Scope note","@lang":"en-EN","@value":"Althoug long-term noise can occur at any time 01 during an analysis, it can be mistaken for a late-eluting peak. Earlier eluting peaks are usually sharper and less easily confused with long-term noise. "},{"@type":"Cataloger's note","@lang":"en-EN","@value":"reference: R112:1994 2.8 "},{"@type":"Cataloger's note","@lang":"en-EN","@value":"ID: 01480 "},{"@type":"Definition note","@lang":"en-EN","@value":"a measure of variation in the detector signal; it can be divided into three components:\n\nshort-term noise includes all observable random variations of the detector signal having a frequency of the order of 10\u20132 Hz to 10\u20131 Hz (one or more cycles per lo minute) and should be measured peak to peak\nlong-term noise includes all observable random variations of the detector signal with frequencies between 0.1 Hz and 1.0 Hz\ndrift is the average slope of the baseline signal measured over a minimum period of one-half hour.\n "}]}