AA Ultrasonic PD Sensor

The AA Ultrasonic acoustic probe is designed for use on air insulated terminations where a clear sound path between the electrically stressed insulation and the probe is present. The sensor is extremely sensitive and can detect activity below 10pC. The probe has a magnetic base to allow coupling to steel enclosures and a swivel head as so the detecting sensor can be aimed directly at the HV point. Corona in air and surface tracking can seriously damage high voltage insulating surfaces in a way that will ultimately lead to flashover and complete failure of the insulator. This discharge activity creates acoustic emission that can be detected using a high frequency sensor. The magnitude of the acoustic emission is indicative of the degree and severity of the discharge activity.

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Technical Specification AA Ultrasonic PD Sensor

Frequency response 40kHz
Receiving Sensitivity -65dB min at 40KHz (0dB = 1 volt/┬Ábar RMS SPL)
Sensor head swivel 360 degrees
Dimensions 71 x 37 x 39 mm
Power Requirements 12VDC, up to 150mA
Output Connector BNC Female
Weight 0.05kg
Coupling Magnetic


AA Ultrasonic PD Sensor