So you’re out in the middle of your plant and you’re about to scan for a leak, or you’re about to test a bearing. You put on the headphones and turn the instrument on. All at once you hear very loud noises and you feel as if your eyeballs are spinning around. You try to reduce the sensitivity as the instruction manual says but you still are a bit confused. This is a typical issue with first time users who have not had any training. There are many ways to overcome competing ultrasounds. First of all, any technique you use should come with the knowledge that the advantage of ultrasound is that it is a relatively weak emission that is directional and can be reflected or absorbed. Here are a few tips.
Scanning: Reduce your sensitivity, move closer to the test subject, use a sound absorbent material such as a wipe rag wrapped around the scanning module (not over the receiving end), determine the direction of the competing sound by waving the scanner around in different directions then scan with the instrument angled away from it, place sound absorbing material such as a cardboard box over the source of the competing sound.
Contact: Reduce your sensitivity, try changing to a higher frequency, wrap a wipe rag around the end of the module at the base of the metal rod, identify the direction of the competing sound by reducing the sensitivity and probing, when found, reduce the sensitivity until the sound you hear is reduced then move back to your test point.
Some of you with experience may have developed other techniques. We’d love to hear from you. Send us an email to email@example.com and we'll be happy to feature these in a future post.