The ULB tester is a hand-held device developed using a PCB board to detect ultrasonic frequencies between20 kHz and 100 kHz. ULB tester has 1 volume knob and 1 gain knob for tuning into the ULB that will betested. The test set includes a self-contained box with a loudspeaker, ultrasonic microphone and a 9-voltbattery. The ULB tester can be utilized to perform functional checks while ULB beacon is still installed in theaircraft.
