4USB Type-C connectorBottom view of the main bodyLAN terminal1/3 octave band analysis screen (NX-43RT)Settings screenMeasurement screen (Time-level graph, presentation of calculated values)FFT analysis screen (×1) (NX-43FT)Marker functionScalability of NL-53The NL-53 supports both wired LAN communication and wireless networking. Calibration history can be managed and viewed di-rectly on the unit, with the option to save it to an SD card inserted in the dedicated slot. The USB Type-C connector simplifies power supply, setting changes, and data transfer.Monitoring from a web browserThe measurement status of the NL-53 can be monitored via a web browser on a computer or smartphone by connecting it to a network. Users can view measurement values, control the NL-53 remotely, playback sound data in real-time, and flag characteristic sounds using the marker function, all from a remote location. No special software is required. All remote functions are accessible using the built-in web application.Extended functionality with optional programsTo the left are examples showing the optional programs, the NX-43RT, the octave and 1/3 octave real-time analysis program, and the NX-43FT, the FFT analysis program. The NX-43RT performs frequency analysis and displays results superimposed on a graph of the data currently being an-alyzed. It offers other functions, including the curves (NC, NR, Cz) display required for indoor noise evaluations.. The NX-43FT performs FFT analysis and is capable of measur-ing sound levels for a more detailed frequency range. Oth-er optional programs include the NX-43WR, a waveform recording program. Installing these optional programs expands functionality to meet specific measurement site conditions.Exploring the functionality and quality of sound level meters for the new applicationIn the field of measurement, connec-tivity is a huge advantage. Drawing from his experience of work with customers to date, Kazama suggested that there are three basic types of sound level meter measurements.“The first is for environmental noise,” says Kazama. “The second is for sound emitted by products in industrial settings. The last is for the quality of sound inside buildings.”For a long time, sound level meters were used to measure environmental noise for noise pollution control. Now, they are also used for quality inspections in industrial settings, as inspection devices capable of detecting differences in sound quality. For example, in man-ufacturing lines for motorized products, sound level meters are incorporated into quality inspection systems to detect defects through sound. Once an abnormal sound is detected, these systems immediately alert the quality control personnel. When measuring inside buildings, sound emit-ted in an adjacent room can be measured simultaneously to evaluate the acoustic properties of building materials.In all three applications, connectivity contributes directly to enhancing conve-nience. In environmental applications, Internet connectivity enables monitoring of equipment installed in remote loca-tions for long-term noise measurement. In industrial settings, enhanced connec-tivity makes it easier to build the entire system incorporating sound level meters and various other peripheral devices. In building applications, connectivity allows sound measurements remotely controlled from outside the room, sig-nificantly reducing the labor required for measurements.“I believe we’re currently witnessing a transition in sound level meters,” says Kazama. “They’re moving toward new applications.”Connectivity can significantly expand the possibilities of measurement.Taisuke Ezoe, who was in his second year with Rion, was among the project team members who verified the NL-53, a model designed to satisfy the specifica-tions in demand at the time.“I joined the project team midway through the development phase of the optional programs for the market model. I was mainly responsible for verification —examining whether they met the per-formance expectations for the product and checking whether the output values of calculation processes were precise.”The release of the sound level meter was followed by development of related optional programs to observe differences in sound quality and updated programs to meet market demands. Ezoe recalls his attitude in approaching these verification processes.“It’s important to spend a lot of time with the sound level meter. That’s how you discover unexpected defects. I think it’s vital to constantly watch it so that I don’t miss even the slightest anomaly.”Ezoe developed an interest in acous-tics as a student and studied in the acous-tic design department at his university. He describes how he has changed over time.“As a student, I used Rion’s sound lev-el meter without fully understanding it, but now that I’m on the production side, I’m learning the details of the calculation methods of various sound evaluation values as part of my job, which has been a valuable experience.”Recognized for how he faced the product without compromise, Ezoe was later assigned to the design of optional programs.
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