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The NSRT_mk4 is a wireless sound level meter datalogger with a dust-protected type 1 digital MEMS microphone, an accurate date/time clock, a non-volatile 128 Mb recording memory and wireless connectivity with fast USB and WiFi download.
The NSRT_mk4 series is designed to work outdoors.
Consult the Mounting Directions.
The Sound Level Meter Data Logger NSRT_mk4 is the 4th generation of Convergence Instrument’s smart integrating sound-level meter/datalogger. It includes a type 1 digital MEMS microphone, an accurate date/time clock, and a non-volatile 128 Mb recording memory with a fast USB download.
Running on battery, it can record sound pressure levels for a week. Connected to an external USB charger it can record for months. Its very small size allows it to be attached to or embedded within the monitored equipment.
Every Sound Level Meter Data Logger NSRT mk4 purchased is provided with an Individual Manufacturer’s Certificate of Calibration from Convergence Instruments. This all-digital design includes the A, C and Z weighting curves. It is enclosed in a completely weatherproof casing which is designed for indoors and outdoors applications. Its highly sensitive Type 1 MEMS microphone has a noise floor of 30 dB-A, and is ultra stable with time and temperature variations. The software includes an oscilloscope and spectrum analyzer features.
Mounting Base and Tripod Adapter are included.
The Sound Level Meter Data Logger NSRT_mk4 is the 4th generation of Convergence Instrument’s smart integrating sound-level meter/datalogger. It includes a type 1 digital MEMS microphone, an accurate date/time clock, and a non-volatile 128 Mb recording memory with a fast USB download.
Running on battery, it can record sound pressure levels for a week. Connected to an external USB charger it can record for months. Its very small size allows it to be attached to or embedded within the monitored equipment.
Every Sound Level Meter Data Logger NSRT mk4 purchased is provided with an Individual Manufacturer’s Certificate of Calibration from Convergence Instruments. This all-digital design includes the A, C and Z weighting curves. It is enclosed in a completely weatherproof casing which is designed for indoors and outdoors applications. Its highly sensitive Type 1 MEMS microphone has a noise floor of 30 dB-A, and is ultra stable with time and temperature variations. The software includes an oscilloscope and spectrum analyzer features.
Mounting Base and Tripod Adapter are included.
| 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 |
| Recording Resolution | 0.1 dB |
| Duty Rate of Signal Capture | 100% – No Missed Samples |
| Min Log Interval | 125 ms (8 points of Lpeak, Lmin, Lmax and LEQ per second) |
| Real-Time Spectral Display | 2048-Point Power Spectrum – dB or Lin Scale. |
| Calibration | Field-calibrated using a 1/2" calibrator |
| Connectivity | USB |
| Internal Battery Type | Integral Li-Poly – USB-Rechargeable |
| Recharge Time | 2 h 30 (Typical) |
| Internal Battery Autonomy (Full-Charge) | 7 days while recording |
| Internal Battery Life | > 300 Charge/Discharge Cycles |
| Temperature Range | -20°C to 60°C (-4°F to 140°F) |
| Recording Memory | Non-Volatile Flash Memory |
| Recording Memory Capacity (RT128 Model) | 128 Mb, Ex: can continuously record Lmax, Lmin and Leq levels at 1s intervals for 32 days, or 10s intervals for 320 days. |
| Recording/Erasure Cycles | Greater than 100 000 |
| Data Retention | Greater than 20 Years |
| Dimensions | 19 mm x 42 mm x 160 mm – (0.75” x 1.65” x 6.25”) |
| Weight | 100 g (0.1 lbs) |
| Construction | Weather-proof enclosure |
| Microphone Dust Protection | Expanded polytetrafluoroethylene (ePTFE) dust and water barrier |
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| Software | Description | Importance | Download |
|---|---|---|---|
| Instrument Manager Universal Installer | Instrument Management Software | Essential Install BEFORE connecting the instrument |  |
| Noise Sentry RT Community Noise Metrics Installer | An application to calculate various noise metrics, such as CNEL, LDEN… and many others | Optional | |
| Instrument Disk Recorder | An application to stream to disk the acoustic signal | Optional | |
| NSRT AutoCalc | An application to calculate and automatically export standard metrics to Excel (LEQ, Lmin, Lmax, percentiles…etc.) | Optional | |
| NSRT Directivity | An application to show the frequency response and directivity pattern | 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 |
