USD 38O1 / 38O2 

ULTRASONIC DETECTOR with an optical sight

 External partial discharges at high-voltage electrodes (corona) possess an acoustic spectrum, which extends to the ultrasonic region. Because of the strong directivity of high- frequency sound waves, ultrasonic detectors do not only allow detection, but also the localization of corona discharges, for instance, in switchyards, high-voltage test set-ups or transmission lines. The ultrasonic detector USD 38O1/38O2 operates at a frequency of approx. 33 kHz that is particularly suitable for external partial discharge detection. The combination of a highly directional ultrasonic microphone and a parabolic reflector system allows an exceptional directivity of the acoustic sensitivity. The microphone output signal is picked up by a selective amplifier and transformed into an audible signal. This allows a simple evaluation of the partial discharge intensity by headphones.

The excellent acoustic directivity of the ultrasonic detector can be successfully exploited through optical sights paraxial to the acoustic axis:

Type USD 38O1: Laser sight for indoor applications and outdoor use during the night. Type USD 38O2: Optical gun sight for daylight outdoor use.

Technical Specifications:

Parabolic mirror                                                                                          320 mm Ø, F = 75 mm

Selective ultrasonic receiver                                                                    fo = 38 kHz, B = 2 kHz

Detectable sound pressure at 10 m                                                        app. 1 mPa, min

Divergence angle                                                                                      ± 5°

Volume control, combined with ON-switch                                            0 - 100%

Headphones: cylindrical connector                                                       6.3 mm Ø

Battery power supply                                                                                9 V

USD 38O1:

Laser-sight output power                                                                          app. 0.5 mW

(no eye hazard)

Light beam diameter at 10 m                                                                   app. 20 mm

Lengths                                                                                                       325 mm

Weight                                                                                                         1250 g 

Laser power-supply with battery compartment                                     8*Baby - 1.5 V

ON switch, indicator light and shoulder strap 

Dimensions                                                                                                155*45*175 mm³

Weight                                                                                                         1200 g

High-voltage cable                                                                                     SHV, 1.5 m long

USD 38O2:

Gun sight with reticle                                                                                 4*20

Length                                                                                                         375 mm

Weight                                                                                                         1250 g

Accessories: 

Headphone

Handle, combined with a desktop tripod

Transportation case, aluminum W*H*D                                                485*365*375 mm³