Operating the oil breakdown voltage tester DTA 100 C
6.3 Symbols and abbreviations on the display
Symbols
Indicates an information message
Indicates that the menu for setting the time is open
Indicates that the menu for setting the date is open
Indicates that the menu for setting the withstand voltage is open
Indicates whether an option has been enabled
Used to toggle between menu items
Used to move the cursor to the left/right
Indicates an important process for achieving a precise measurement
Indicates that there is high voltage at the electrodes
Indicates which electrode shape is required to perform a measurement
Further information: Chapter Replacing the electrodes (on page 27)
Standard deviation
The standard deviation shows how close the individual recorded values are
to the average value.
Ratio of the standard deviation to the average value in % (coefficient of
variation).
In IEC 60156, diagram 3 in section 11 illustrates the ratio of the standard
deviation to the average value. This diagram and the determined values can
be used to check whether the measurement result lies within the permitted
range.