User's Manual

PC Software for 1740 Series
PQ Log Feature Reference
29
Graphical Summary
The Graphical Summary screen, Figure 19, is for the European EN50160 standard.
egd015c.bmp
Figure 20. Logger Graphical Summary Screen
A graphical representation of a statistical analysis of all measured parameters for the total
measuring period is shown. We can see which values exceed the limit values as per
standard EN 50160 and/or which reserves are available.
The measured values of each measurement row such as voltage variations, interruptions,
harmonics (i.e. thd), and flicker are classified according to quantity.
95 % of all measured values are below the 95 % value. The remaining 5 % of measured
values exceed this value but have to be below the 100 % limit value (for slow voltage
variations and frequency). The 95 % value provides statistical information about the
distribution of the measured values. Beneath the limit value line the file name of the
actual limit value file can be seen.
A stacked bar chart is used for the presentation.
Bars are drawn for each of the three phases for each measurement parameter.
The measured maximum value and 95 %-value are scaled with the corresponding limit
value. The limit value line is superimposed so that it can be determined whether:
• The limit value has been exceeded. The 95 %-value (red bar) is above the limit
value line
• The limit value has not been exceeded. The bar is always below the limit value
line