Ultrahound Discharge and Corona Detector

The Ultrahound is a highly directional and sensitive partial discharge, arcing and corona detector. Electric discharges in air emit broad spectrurm noise and using ultrasonic techniques the source of any discharge can be traced. Electric discharging of outdoor power line components can cause radio and TV frequency interference or indicate possible future failure of equipment. The Ultrahound dish can be used from up to 30 m from the noise source. A separate short range direction wand is used for close inspection.

The Ultrahound may be used for a variety of situations including:

  • Power line discharge such as cracked insulators or bushings, faulty cable termination or damaged line hardware.
  • Corona due to damaged substation or conductor hardware.
  • Partial discharge of equipment under HV test (laboratory or in the field).


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Frequency Response: 37 - 43 kHz, with excellent out of band rejection

The piezo electric element located in the focal point of the dish, is designed to resonate over a very limited audio band enabling excellent out of band rejection. The noise rejection out of band is > 50 dB below 20 kHz.

Highly directional dish enables accurate pin pointing of faults

The use of the specially designed dish enables the fault location to be located to within less than

Multi function display

Audio and dB display (relative), the dB display can be adjusted over five ranges 0dB, 20dB, 40dB, 60dB and 80dB. Alternatively the instrument can be run in auto ranging mode by pressing the MODE button.

Easy portability

All components can be transported in the carry box supplied, The dish can be operated with a single hand while the display unit can be held with the other it measures 195x100x40mm. The dish has a diameter of 250mm

Easy to read LCD

The screen is a reflective LCD with a 15mm tall 4.5 digit 7 segment display.

Battery Powered

The handheld unit is powered by 4x AA 1.5V cells, the dish is powered from the handheld unit.

Easy to self test improves user confidence

The use of the 1 μW 40 kHz/100 Hz modulated noise source enables easy testing before testing.


User Manual

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