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The NSRT_mk4_Dev is a sound level meter with a dust-protected type I digital MEMS microphone and USB connectivity. This instrument is similar to the NSRT_mk4 in form, function and performance but is aimed at developers and OEMs.
The NSRT_mk4 series is designed to work outdoors. Consult the Mounting Directions.
The Sound Level Meter Data Logger NSRT_mk4_Dev is similar to the NSRT_mk4 in form, function and performance, but has been redesigned with developers in mind. This instrument is designed to be used while connected to a host such as a Raspberry Pi. In such applications the NSRT_mk4_Dev is driven by a custom application. Such application can easily configure the instrument read its data in real-time, and perform other custom functions as intended by the developer. The NSRT_mk4_Dev cannot be used in standalone mode.
The NSRT_mk4_Dev has an optional Audio USB Interface. Through that interface, the instrument is seen as a USB microphone, and its audio signal can be captured in real-time. Unlike a typical USB microphone, the audio signal that the instrument streams is weighted and calibrated in Pa.
Note: The Virtual Com Port interface, and the USB-Audio interface are not mutually exclusive. They can be used simultaneously.
The Sound Level Meter Data Logger NSRT_mk4_Dev is similar to the NSRT_mk4 in form, function and performance, but has been redesigned with developers in mind. This instrument is designed to be used while connected to a host such as a Raspberry Pi. In such applications the NSRT_mk4_Dev is driven by a custom application. Such application can easily configure the instrument read its data in real-time, and perform other custom functions as intended by the developer. The NSRT_mk4_Dev cannot be used in standalone mode.
The NSRT_mk4_Dev has an optional Audio USB Interface. Through that interface, the instrument is seen as a USB microphone, and its audio signal can be captured in real-time. Unlike a typical USB microphone, the audio signal that the instrument streams is weighted and calibrated in Pa.
Note: The Virtual Com Port interface, and the USB-Audio interface are not mutually exclusive. They can be used simultaneously.
| Bandwidth | 20 Hz to 20 kHz |
|---|---|
| Microphone Sensor | Digital MEMs |
| Precision Class | Complies with the precision requirements of IEC61672-2002 Type I |
| Saturation Level (typical @ 1 kHz) | 120 dB-A, 120 dB-C, 120 dB-Z |
| Temperature Error | Better than 0.6 dB (-20°C < T < 60°C) |
| Sensitivity to Vibrations | 60 dBSPL/g (20 dB lower than typical measurement microphone) |
| Weighting Curve | dB-A, dB-C, dB-Z |
| Noise-Floor (Typical) | 30 dB-A, 46 dB-C, 52 dB-Z |
| Duty Rate of Signal Capture | 100% – No Missed Samples |
| Calibration | Field-calibrated using a 94 dB 1/2” calibrator |
| Connectivity | USB: Virtual Com Port, Optional USB-Audio interface |
| Temperature Range | -20°C to 60°C (-4°F to 140°F) |
| Dimensions | 19 mm x 42 mm x 160 mm – (0.75” x 1.65” x 6.25”) |
| Weight | 50 g (0.1 lbs) |
| Construction | Weather-proof enclosure |
| Microphone Dust Protection | Expanded polytetrafluoroethylene (ePTFE) dust and water barrier |
| Protocol | Open and Documented |
Convergence Instruments 2024 © All Rights Reserved | Privacy Policy and User Agreement | Terms and Conditions | Limited Warranty
| Software | Description | Importance | Download |
|---|---|---|---|
| Instrument Manager Universal Installer | Instrument Management Software | Essential Install BEFORE connecting the instrument |  |
| NSRT Directivity | An application to show the frequency response and directivity pattern | Optional | |
| Raspberry Pi demo code | Courtesy of Xander Hendriks | Optional | |
| NSRT_mk4 | NSRT_mk4_Dev | NSRTW_mk4 (Wireless) | NSRTW_mk4 MQTT (Wireless) | |
|---|---|---|---|---|
| Precision Class | Type I | Type I | Type I | Type I |
| Connectivity | USB-only | USB-only | USB & WiFi | USB & WiFi |
| Email Alarm Functions | No | No | Yes | No |
| Cloud Solution Compatibility | No | No | Yes | No (designed to work with a standard MQTT broker) |
| Weighting Curves | A, C, Z | A, C, Z | A, C, Z | A, C, Z | Values measured | Lpeak, Lmin, Lmax, LEQ | L instantaneous, LEQ | Lpeak, Lmin, Lmax, LEQ | Lpeak, Lmin, Lmax, LEQ |
| Recording of Acoustic Signal | Included | Optional (USB-Audio option) | Included | Included |
| Attachment System | Wall or Tripod Mountable | Wall or Tripod Mountable | Wall or Tripod Mountable | Wall or Tripod Mountable |
| Weight | 3.3 oz 93 g |
50 g | 3.3 oz 93 g |
3.3 oz 93 g |
| Data | Non-Volatile | N/A | Non-Volatile | Non-Volatile |
| Settings | Non-Volatile | Non-Volatile | Non-Volatile | Non-Volatile |
| Software | Instrument-Manager NSRT-Community-Noise-Metrics |
Instrument-Manager | Instrument-Manager Instrument-Listener NSRT-Community-Noise-Metrics |
Instrument-Manager NSRT-Community-Noise-Metrics |
| Timer | Yes | No | Yes | Yes |
| FFT Resolution (For Real-Time Display Only, Not Recording) | 2048 points | 2048 points | 2048 points | 2048 points |
| Generic Audio Driver Support | Included | Optional | Included | Included |
| Generic Com Port Driver | No | Yes | No | No |
| Platform Support | Windows | Windows, MacOS, Linux (and any platform that includes a generic USB CDC-class driver) | Windows | Windows |
| Open Communication Protocol | No | Yes (VCP over USB) | No | Yes (MQTT over WiFi) |
| Rechargeable Battery Autonomy | 7-Days (Recording) | No Battery | 7-Days (Recording) | 7-Days (Recording) |
| Recording Memory | 128 Mb | No Memory | 128 Mb | 128 Mb |
