• Insulation resistance measurement to 15 TΩ
• Mains and battery powered testing
• 3mA short circuit test current
• Three alarms and three timers
• Data storage
• Backlit display
The BM25 is designed for testing the insulation of high- voltage electrical equipment. Its wide voltage range also allows applications to low-voltage equipment.
Generators, motors, transformers, cables and switchgear all require effective maintenance. The test techniques on the BM25 provide valuable diagnostic information.
Insulation suffers from gradual, steady decline as well as occasional sudden damage. The effects of dirt, grease, moisture, vibration and chemical attack can be tracked by recording polarization index tests which are not limited by the temperature-dependence of raw insulation resistance measurements.
Polarization index (PI) is a time-resistance dielectric absorption test. PI tests are also helpful when full test records have not been maintained.
To find more localized insulation problems, the BM25 includes both step voltage and dielectric discharge tests. Step voltage identifies local weak spots which respond differently as electrical stress is increased. The dielectric discharge test can show a single bad layer in multilayer insulation.
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