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It is advisable to turn both the LC system and the MS system on for at least 30 minutes prior to analysis. This time can usually be spent running 1 or more solvent or matrix blanks.
Perform loop injections of your analyte using isocractic elution through a short column at the flow rate and approximate mobile phase composition. Use a concentration where the signal to noise is approximately 10:1. Record the raw data file and integrate the peaks, comparing peak areas at different source positions (i.e. left and right, up and down, fore and aft). Ensure that the background noise is not increasing more than the peak area.
Note: The needle position on the Thermo Scientific ™ TSQ Altis MS, TSQ Quantis MS and TSQ Fortis MS instruments is set and should not be adjusted.
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