Megger ADX15, User Manual

Page: 132 / 179

Surge Test Underpowered
The Surge test is load dependent. Anything that adds capacitance to the asset under test will increase load on the
tester. If the asset draws more energy than the tester can deliver, the test will fall short of the recommended test
voltage.
Additionally, windings that have very low inductance, such as commutating coils or armature coils, require greater
current flow and therefore higher energy to affect the desired test voltage.
Testing through long cable runs can also add significant capacitance to ground, which steals some of the energy
intended to ring with the testers capacitor.
This will be realized when the energy bar on the left side of the Surge test screen tops out and the surge voltage stop
below the expected test voltage. An example is shown in the image below.
If this occurs, a larger surge tester with more joules of energy should be used.
Fig 119:
Surge energy bar indicating maximum energy reached.
www.megger.com Megger Baker ADX User Guide
122
Surge Testing Notes and Recommendations