The alarm and event history is one of the most useful tools for diagnosing intermittent problems.
What is recorded
Alarm code, time of occurrence, duration, and in some systems, critical operating values.
Why it is important
A problem may have disappeared by the time the technician arrives. The history shows what happened beforehand.
Sequence of events
The chronological sequence helps determine whether an alarm was the cause or the result of another problem.
Proper use
Do not delete the history before the data and the conditions of occurrence have been recorded.
