Fluke 1744 - Manual (Page 40)

Power Quality Logger
Methods of Logging
31
Voltage Interruptions
The Logger records two types of interruptions:
• All measured RMS values of input voltages that are < 1% of the
nominal voltage. (This threshold can be adjusted in PQ Log.)
• Interruptions > 10 ms (0.5 line power periods).
The start time and duration of each interruption are registered.
Time
90% Un
1%
Duration
100% Un
110% Un
egb018.eps
Figure 15. Voltage Interruption