PerkinElmer Clarus SQ 8 MS Series, Hardware Manual

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Clarus SQ 8 MS Hardware Guide
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Change the simplest thing first. For example, if you suspect a gas leak, the
easiest change to make is the GC septum instead of replumbing the internal
pneumatics.
Change only one parameter at a time and check for its effect. If you change
three items at once and your problem goes away, you may not know which
of the three moves or combination of moves corrected the problem. This
way, if the problem happens again, you will know exactly what corrective
action to take.