PORTABLE SOUND LEVEL METER, Model: NSM-138V

Model: NSM-138V

Features:

  • The NSM-138V sound level meter fully complies with the latest IEC 61672-1:2013 Class 1 standard.
  • Equipped with smart algorithms and a wide measurement range of 25–140 dB, making it suitable for both industrial and public applications requiring high accuracy.
  • Features a modern, lightweight design with a durable ABS/Polycarbonate housing for easy portability.
  • Uses energy-efficient power and supports data storage with 4 GB internal memory, expandable up to 64 GB via microSD card.
  • Accurately measures Leq, T, Lmax, and Lmin (equivalent continuous sound level, measurement duration, maximum and minimum sound levels), while displaying both real-time and interval sound levels.
  • Supports wireless connection to a thermal printer via Bluetooth for convenient on-site result printing.
  • 2.4-inch LCD color screen allows easy operation and displays multiple parameters simultaneously; Vietnamese interface and printouts are user-friendly.
  • Printed results include complete information in Vietnamese: date and time, measurement results, organization, testing location, tester details, and more.
  • The thermal printer is separate from the meter, allowing easy maintenance, replacement, cost savings, and extended device lifespan.

 

Specifications: 

  • Measurement range: 25 – 140 dB
  • Frequency range: 10 Hz – 20 kHz
  • ADC resolution: 24-bit
  • Sampling frequency: 48 kHz
  • Accuracy: IEC 61672-1:2013 Class 1

Frequency accuracy:

  • 20 Hz: ±2 dB
  • 25 Hz: +2 dB / -1.5 dB
  • 31.5 Hz: ±1.5 dB
  • 40–800 Hz: ±1.0 dB
  • 1 kHz: ±0.7 dB
  • 10 kHz: +2 dB / -3 dB
  • 16 kHz: +2.5 dB / -16 dB
  • Time weighting: Fast (F), Slow (S)
  • Frequency weighting: A, C, Z
  • Display: 2.4-inch LCD color screen (240 × 320 pixels)
  • Display resolution: 0.1 dB
  • Data storage: 4 GB internal, supports up to 64 GB via microSD card
  • Output interfaces: AC, DC, USB, IO expansion port
  • Measuring duration: 1 second to 99 hours
  • Controls: 10 buttons
  • Language: Vietnamese
  • Power supply: 4 × AA (LR6) batteries or 5V/1A external power
  • Main measurement indicators: Lxyp, Lxeq, T, Lxmax, Lxmin, LxE, Lxpeak, E, etc.
  • Dimensions (H × W × D): 75 × 32 × 249 mm
  • Weight: 0.32 kg
  • Operating temperature: -30°C to 60°C
  • Relative humidity: 5% to 95%
  • Protection rating: IP67 (waterproof and dustproof)
  • Printer: High-speed thermal printer with Bluetooth connectivity

Printed report includes (Vietnamese):

  • Unit logo
  • Meter information
  • Date and time
  • Tester information (full name, organization)
  • Testing location
  • Driver information (full name, license plate)
  • Measurement results: Lmax, Lmin, Leq, T, LE
  • Driver’s signature
  • Tester’s signature

In the Box: 

  • 01 NSM-138V Sound Level Meter
  • 01 Microphone
  • 01 Windshield
  • 01 Thermal Printer
  • 01 Battery Charger for Thermal Printer
  • 03 Thermal Paper Rolls
  • 01 User Manual
  • 01 Hard Carrying Case
  • 01 Tripod
  • 01 3 m Tape Measure