The test voltage is automatically controlled and increased to a maximum level of up to 75 kV rms.
Flashover voltage is measured with an accuracy of ±1 kV over the whole voltage range.
The extremely short switch off time at flashover is below 5 μs. Thus the pollution of the oil by the electric arc is negligible.
In addition, this allows nondestructive testing of synthetic oil, ester oil and silicone oil.
The BA75 has an integrated rechargeable 12 V battery with a capacity of 7.2 Ah suitable for a test time of approximately 12 hours.
The device can also be operated on 85 V – 264 V (50Hz/60Hz) AC voltage supplies or 12 V DC power supplies.