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Class 2 Sound Level Meter SV 973A

The SV 973A is a professional Class 2 sound level meter designed for occupational noise and environmental assessments. Fully compliant with BS EN 61672-1:2013, it features a patented MEMS microphone with a lifetime warranty, extended operating range from 25 to 141 dB Peak, and real-time 1/1 and 1/3 octave analysis. With built-in Bluetooth® and support for the Assistant Pro mobile app, the SV 973A is ideal for HSE-compliant noise monitoring in UK workplaces.

The Best Class 2 Noise Meter

The SV 973A stands out as the best Class 2 sound level meter thanks to its robust MEMS microphone and advanced sound exposure features. With a wide dynamic range and compliance with BS EN 61672-1:2013, this device meets UK professional expectations for industrial, environmental, and occupational noise assessments.

The SV 973A also supports real-time 1/1 and 1/3 octave analysis, STIPA, and RT60 measurements—functions rarely found in Class 2 instruments. Combined with a Bluetooth® interface and Assistant Pro app, this meter provides unmatched functionality for daily use in the field.

Features

Accuracy

Class 2 performance according to BS EN 61672-1

The SV 973A meets the BS EN 61672-1:2013 standard, offering accurate measurements across 20 Hz to 10 kHz with ±1.1 dB deviation. It features two distinct measuring ranges for sound level (30 dBA to 129 dBA Peak) and sound exposure (45 dBA to 141 dBA Peak), supporting reliable use in both workplace and environmental assessments.

Frequency Analysis

Real-time octave filters and WAV recording

The SV 973A enables 1/1 and 1/3 octave analysis for precise identification of noise sources. It also supports WAV recording to capture noise events, allowing post-analysis and sound source documentation, ideal for detailed acoustic diagnostics.

Digital Meter

Sound level data acquisition and logging

The meter uses an analog-to-digital converter (ADC) and advanced weighting filters to transform ambient sound into digital readings. Results are logged in 8 GB memory as time histories and can be exported to PC software for deeper analysis and reporting.

Class 2 vs. Class 1

Differences in accuracy and measurement range

Class 2 meters, such as the SV 973A, maintain ±1.1 dB accuracy from 20 Hz to 8 kHz and operate from –10°C to +50°C. Compared to Class 1 meters, which offer tighter ±0.8 dB accuracy from 16 Hz to 16 kHz, Class 2 models offer greater flexibility for field applications.

Difference between Class 2 and Class 1 Sound Meter

Microphone

MEMS-based technology with lifetime durability

The SV 973A microphone is based on MEMS technology, delivering shock resistance, low energy consumption, and a lifetime warranty. It supports consistent accuracy within the Class 2 specification, enhancing reliability and battery life.

Mobile Application

Assistant PRO for remote operation and alerts

The meter connects via Bluetooth® to the Assistant PRO app, enabling remote control, real-time viewing, and features like STIPA and RT60 measurement. This mobile integration streamlines noise monitoring and reporting directly from smart devices.

Auto Calibration

Fast acoustic calibration with stability tracking

The SV 973A features automatic dual-point calibration (94 dB and 114 dB), storing results and comparing them to past calibrations to track microphone drift. This ensures field-ready accuracy and simplified compliance checks.

RT 60

Reverberation time measurement for acoustic spaces

The RT60 function allows precise reverberation time analysis, essential for environments such as classrooms. By following acoustic standards for decay times, the meter helps ensure optimal speech intelligibility and compliance with sound clarity requirements.

Accuracy

Class 2 performance according to BS EN 61672-1

Frequency Analysis

Real-time octave filters and WAV recording

Digital Meter

Sound level data acquisition and logging

Class 2 vs. Class 1

Differences in accuracy and measurement range

Microphone

MEMS-based technology with lifetime durability

Mobile Application

Assistant PRO for remote operation and alerts

Auto Calibration

Fast acoustic calibration with stability tracking

RT 60

Reverberation time measurement for acoustic spaces

Download Class 2 Noise Meter Brochure

Download the SV 973A Class 2 Sound Level Meter catalogue to explore its advanced features, including real-time frequency analysis, triggered audio recording, and extended STIPA and RT60 measurement capabilities. This compact and durable meter is ideal for occupational noise assessments, offering high performance with low power consumption and full mobile app integration for streamlined field operation.

Download PDF

Applications

Occupational Noise Measurements

Class 2 Noise at Work Assessments

The SV 973A is a Class 2 Sound Level Meter designed for workplace noise assessments in line with UK Control of Noise at Work Regulations 2005 and BS EN 61672-1. It measures up to 141 dB and delivers accurate results even in harsh industrial environments. With its durable MEMS microphone and easy-to-use interface, it ensures efficient and compliant noise monitoring.

Class 2 Sound Measurements

Accurate noise assessments up to 10 kHz

The SV 973A Class 2 Sound Level Meter measures sound pressure levels up to 10 kHz, fully compliant with BS EN 61672-1:2013. It supports A, C and Z frequency weightings and time-weighted measurements, ensuring reliable results in schools, workplaces, and construction sites. Built for precision and ease of use, it’s ideal for both environmental and occupational noise monitoring.

STIPA in accordance with BS EN 60268

Class 2 Speech Transmission Measurements

STIPA, as defined in BS EN 60268-16, assesses the speech intelligibility of public address and voice alarm systems in venues like airports, concert halls, and shopping centres. The method requires a Class 2 sound level meter compliant with BS EN 61672-1, such as the SV 973A. With support from the Building Acoustics PRO app, the SV 973A enables efficient STIPA analysis and system performance evaluation.

Occupational Noise Measurements

Class 2 Noise at Work Assessments

Class 2 Sound Measurements

Accurate noise assessments up to 10 kHz

STIPA in accordance with BS EN 60268

Class 2 Speech Transmission Measurements

The Best Class 2 Sound Level Meter

The class 2 sound level meter is a professional sound measuring device, which can measure the noise of various environments.

Professional Type 2 Noise Meter

With its high accuracy and wide range of measurement, it's perfect for any noise survey.

Check Availability & Price

Class 2 Sound Level Meter SV 973A

The kit includes the SV 973A Class 2 sound level meter with robust MEMS microphone (lifetime warranty) • SA 22 windscreen • SA 80 soft bag • 8 GB built-in memory • four AAA batteries • USB-C cable • USB drive with user manual • factory calibration certificate • 36-month warranty card upon registration.

SV 34B - Class 2 Sound Calibrator

Sound Calibrator Class 2 : 1000 Hz/114 dB

SA 22 - Windscreen for 1/2"" microphone (70 mm)

Windscreen for 1/2" microphone (70 mm)

SV_CA_SLM - Accredited calibration of the sound level meter according to EN 61672-3:2014

Accredited calibration of the sound level meter according to EN 61672-3:2014

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Specifications

Class 2 Sound Level Meter SV 973A

Applications

Sound measurements

Occupational noise

Building acoustics

Hardware Features

Number of channels

Self-vibration detection

Auto-calibration

Bluetooth

Communication Interfaces

USB, Bluetooth

Display

Keyboard

8 keys

Memory

internal 8 GB

Battery type

4 x AAA

Operating time

20-38 hours

Operating temperature range

-10 °C to 50 °C

Humidity range

up to 95% RH, non-condensed

Weight

225 g

Size

229 x 52 x 20 mm

Sound measurements features

Standards

Class 2: IEC 61672-1:2013

Microphone type

MEMS

Preamplifier type

Integrated

Linear operating range to IEC 61672

SLM: 30 dBA Leq÷141 dBA Peak

Total measurement range

25 dBA Leq÷141 dBA Peak

Internal noise

< 25 dBA RMS

Frequency range

20 Hz ÷ 10 kHz

Weighting filters

Frequency weighting: A, C, Z

Time constants

Slow, Fast, Impulse

Exchange rates

2, 3, 4, 5, 6

Criterion levels

adjustable

Profiles per channel

Min logging step

100 ms

Statistics

Ln (L1-L99)

Statistics in octaves or third octaves

Audio recording

option

Voice coments

1/1 octave

option

1/3 octave

option

RT60

option

STIPA

option

Class 2 Sound Level Meter SV 973A

The Best Class 2 Noise Meter

Features

Accuracy

Frequency Analysis

Digital Meter

Class 2 vs. Class 1

Microphone

Mobile Application

Auto Calibration

RT 60

Catalogue

Download Class 2 Noise Meter Brochure

Applications

Occupational Noise Measurements

Class 2 Sound Measurements

STIPA in accordance with BS EN 60268

Videos

The Best Class 2 Sound Level Meter

Professional Type 2 Noise Meter

Check Availability & Price

Specifications

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