The NA43 outdoor protective device meets the IP65 protection standard, featuring a 70mm windproof ball and seamless waterproof mesh for comprehensive microphone protection. This design ensures effective dust and waterproof capabilities. In outdoor noise measurements, sensitive microphones and equipment are exposed to diverse weather conditions like rain, wind, and snow. The NA41 device is designed to withstand such harsh elements, safeguarding equipment and data against adverse weather effects effectively.

The NA43 outdoor protective device consists of a main body component and a windproof cover. The main body is divided into upper and lower sections, with the upper section featuring evenly spaced protrusions at a specific angle to secure the windproof cover. This design effectively directs water away to protect the microphone from moisture ingress. The lower section is intricately designed to accommodate the microphone. Both sections are fastened with threads, facilitating easy manual disassembly for microphone calibration.

The equipment provides effective wind noise reduction and excellent wind resistance. In an environment with a wind speed of 10 meters per second, the combination of the NA41 windproof cover and device structure can provide over 30dB of wind noise reduction. Furthermore, the equipment as a whole can operate normally without damage in an environment with a wind speed of 30 meters per second.

The NA43, when used in conjunction with a microphone, enables remote self-diagnostic functionality. In practice, the NA43 emits a 1kHz, 94dB sound pressure level signal using an electrostatic excitation power source for calibrating the microphone to verify system accuracy. When the verification results fall within the tolerance range, the system test results can be considered accurate. However, if there are significant deviations, manual on-site calibration is required to correct them. This feature is fully controlled remotely, reducing the costs of on-site maintenance personnel.