MEGABRAS MD-5060x Manual De Uso página 24

6.2. Dielectric Absorption Index (DAI)
The key makes it possible to visualize the Dielectric Absorption Index
value on the display. For this kind of test, the equipment should be
connected, applying voltage to the sample for 60 seconds. After this
period, the operator must press the key to read the absorption index
value on the display. If this key is pressed before the 1-minute period has
elapsed, the display will show DAI = - - -.
The Dielectric Absorption Index is the ratio between the insulation
resistance value measured after 60 seconds and the value measured
after 30 seconds. This value is useful to determine whether it is necessary
to perform preventive and predictive maintenance on the coils
(transformers, engines and motors, generators, etc.).
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