Sound Level Meter Data Logger with type 1 microphone | NSRT_mk2

306.00 $ USD

The NSRT_mk2 is a sound level meter datalogger with a type 1 digital MEMS microphone, an accurate date/time clock, and a non-volatile 128 Mb recording memory with a fast USB download.

In stock (can be backordered)

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Product Description

The Sound Level Meter Data Logger NSRT_mk2 is the second 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 mk2 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.

New Features of the NSRT_mk2

  • Type I precision (bandwidth selectable between 16 kHz and 20 kHz)
  • “Z” weighting (in addition to A and C)
  • Fast USB downloads
  • Real-time recording while connected to PC (Use of the SLM as a high quality digital microphone at 32 kHz and 48 kHz sampling rates)
  • New “universal” Manager application that can manage any instrument in the Noise Sentry RT series

Sound Level Meter Data Logger NSRT_mk2 Applications

  • Sound level and acoustic dose measurement and recording.
  • Monitoring of safe working conditions.
  • Activity detection and logging.
  • Long-term measurement and recording of acoustic levels for environmental impact studies.
  • Specially designed for long-term outdoors applications.


Weight 0.1 lbs
Dimensions 4.5 x 3.5 x 3 in

25 Hz to 20 kHz

Microphone Sensor

Digital MEMs

Precision Class

Type I

Saturation Level (typical @ 1 kHz)

123 dB-A, 123 dB-C, 123 dB-Z

Temperature Error

Better than 0.1 dB (0°C < T < 60°C), Better than 0.5 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, 40 dB-C, 45 dB-Z

Recording Resolution

0.1 dB

Duty Rate of Signal Capture

100% – No Missed Samples

Min Log Interval

125 ms (8 points of Lmin, Lmax and LEQ per second)

Real-Time Spectral Display

512-point Power Spectrum – dB or Lin Scale.


Field-calibrated using a 1/2" calibrator



Internal Battery Type

Integral Li-Poly – USB-Rechargeable

Recharge Time

2 h 30 (Typical)

Internal Battery Autonomy (Full-Charge)

7 days while recording (WiFi operation will drain battery slightly more, depending on rate of connect)

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


7.62 x 3.94 x 5.9 cm – (3” x 1.55” x 0.81”)


100 g (0.1 lbs)


Integrally Potted Weather-Proof ABS Enclosure

  • Type I precision
  • A, C and Z weighting curves.
  • Integrating Sound-Level Meter, records L-max, L-min and Leq levels.
  • Log interval adjustable from 125 ms (8 points per second) up to hours.
  • Individual Manufacturer’s Certificate of Calibration from Convergence Instrument provided with every instrument purchased.
  • Digital very sensitive MEMS microphone (29 dBA typical noise floor)
  • Completely sealed weatherproof enclosure designed for outdoors applications.
  • All-digital design.
  • Ultra-stable sensitivity (field recalibration is easily done, but seldom required)
  • Very low sensitivity variation due to temperature changes
  • Very low sensitivity to vibrations
  • Software function calculates global Leq and/or dose, according to ISO and OSHA methods.
  • Adjustable response time.
  • Preprogrammed recording start date/time.
  • Integrated oscilloscope function that can show the acoustic signal in real time.
  • Integrated spectral analyzer function that can show the spectrum (or 3rd-octave bands) in real time.
  • Can be used as a high-quality USB digital microphone
  • Allows the observation of recorded levels while the recording is ongoing.
  • Works standalone, or USB connected.
  • Long life internal rechargeable battery that recharges from USB and most USB chargers.
  • Can be field-calibrated.
  • Observes and records 100% of the acoustic signal (no missed samples).
  • Editable individual custom ID for easier instrument management.
  • All settings are stored in non-volatile memory. So the instrument will regain full functionality from hard-reset or battery loss.
  • All data stored in non-volatile memory, so it is not lost in case of hard-reset or battery loss.
Noise Senrty RT (Discontinued) NSRT_mk2 Noise Sentry RT-W (Wireless) (Discontinued) NSRTW_mk2 (Wireless) Noise Sentry RT-P (Personal)
Precision Class Type II Type I Type II Type I Type II
Rechargeable Battery Autonomy 7 Days (Recording) 7 Days (Recording) 7 Days (Recording) 7 Days (Recording) 7 Days (Recording)
Connectivity USB USB USB & wiFi USB & wiFi USB
Weighting Curves A, C A, C, Z A, C A, C, Z A, C
Recording of Acoustic Signal No Yes No Yes No
Attachment System Wall or Tripod Mountable Wall or Tripod Mountable Wall or Tripod Mountable Wall or Tripod Mountable Worn on Clothes
Weight 3.6 oz
103 g
3.3 oz
93 g
3.3 oz
93 g
3.3 oz
93 g
2.8 oz
80 g
Memory 128 Mb 128 Mb 128 Mb 128 Mb 64 Mb
Data Non-Volatile Non-Volatile Non-Volatile Non-Volatile Non-Volatile
Settings Volatile Non-Volatile Non-Volatile Non-Volatile Non-Volatile
Software NSRT-Manager
LabVIEW Driver
Email Alarm Functions Only while Connected to a PC None When Working Stand-Alone When Working Stand-Alone None
Timer One Time Start One Time Start One Time Start One-Time-Start Repeated Start & Stop
FFT Resolution (For Real-Time Display Only, Not Recording) 512 points 1024 points 256 points 1024 points 512 points
Software Description Importance Download
Noise Sentry RT Manager Universal Installer (V410, July, 2017) Instrument Management Software Essential Install BEFORE connecting the instrument
Noise Sentry RT Community Noise Metrics Installer (V350, July, 2017) An application to calculate various noise metrics, such as CNEL, LDEN… and many others Optional

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