The PW3198 Power Quality Analyzer can be used to detect periodic instantaneous voltage drops.
Instantaneous voltage drops may be caused by the periodic start and operation of a heater or other equipment with a high inrush current connected to the power supply line. Power Quality Analyzers like the PW3198 can analyze periodic voltage drops to identify the electric equipment that is causing it.
In the example used, it was determined that the instantaneous voltage drop in RMS voltage, which occurred about every 13 minutes, was caused by the start and operation of electric equipment with a high inrush current. Here, the instantaneous voltage drop was about 190 Vrms. At this level (200 V +-5%), most electrical equipment will work normally and such a drop will not be regarded as a problem. However, customers should be careful when adding new loads.