oring period. Usually, agood first choice isatleast one business cycle, oratleast 1day, and monly, 1week. Itmay benecessary tomonitor until the problem recurs. Some monitors can record indefinitely bydiscarding older data tomake space for new data. These monitors can beinstalled and left until the problem recurs. When the problem recurs, the monitoring should bestopped before the event data isdiscarded. After the monitoring period ends, the most difficult task begins — interpreting the data. Modern power quality monitors produce reams ofdata during adisturbance. Data interpretation islargely amatter of experience, and Ohm ’slaw. There are many examples ofdisturbance data inbooks such asThe BMI Handbook ofPower Signatures, Second Edition, and the z Field Handbook for Power Quality Analysis.
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