Your One stethoscope should provide a low-noise, high-quality signal. However, if the stethoscope is used on clothing or not applied correctly to the patient, artifact sound can be produced. To reduce or eliminate such noise, simply apply the probe as recommended, making good skin contact with the patient.
There are some interfering noises that can occur. Potential culprits are listed below, with remedies:
- Radio stations or electromagnetic pickup: Move One to a location that does not have strong electromagnetic fields. One has been hardened against such interference, but it is technically possible, albeit unlikely, that noise can be induced by such sources.
- Continuous loud buzzing: The diaphragm is loose. Tighten the diaphragm retainer ring.
- Continuous loud buzzing: One is connected to other equipment that is either producing its own buzzing or noise, or has grounding problems that are inducing noise in the system. Try disconnecting One from the equipment and listening. If the problem goes away, it's not the One. If it persists, check the diaphragm et al.
If you're hearing really weird thunder-like noises from your stethoscope, which possibly change when you press on the diaphragm, there's probably some lint or foreign speck of dust inside your stethoscope. Fortunately, One is super-easy to clean. Refer to the Cleaning Instructions regarding unscrewing the diaphragm and using a dry air spray to clean out the space around the sensor.
While rare, we occasionally see this problem. The origin of such noises is quite simple. There's a high voltage between the diaphragm and the plate behind it. This is the unique Thinklabs sensor design. If a piece of lint gets into your stethoscope, it might sit between the high voltage plate and some other part of the circuit, or the diaphragm. The lint then provides a current path for the sensor to discharge. This tiny pico-amp or nano-amp current flow will sound like thunder or strange sound effects after it's amplified, but in reality, it's completely benign in terms of potential for damage. So don't worry, just clean it out.