Class 2 Sound Level Meter
SV 973A

The SV 973A is a Class 2 Sound Level Meter compliant with BS EN 61672-1:2013, designed for professional noise measurements in workplaces. With a frequency analysis in both 1/1 and 1/3 octaves, it aids in identifying noise sources. Its MEMS-based patented microphone ensures durability and extended battery life, and is backed by a lifetime warranty. The device meets Class 2 frequency response standards up to 10 kHz and operates between -10°C and 50°C, aligning with Class 1 temperature requirements. Its measurement range is 25 dB to 129dB, but can reach up to 141 dB Peak with its sound exposure meter function. This allows it to gauge both industrial and environmental noises, even amidst minimal background disturbance. The SV 973A provides comprehensive sound data, including LEQ, MIN, MAX, and PEAK, and integrates vital weighting filters. Enhanced with Bluetooth, it pairs with the Assistant Pro app to augment its functionality.

What is Class 1 and Class 2 noise meter?

Class 1 and Class 2 noise meters are professional devices designed to measure sound levels with varying degrees of precision as per BS EN 61672-1:2013 standards. Though Class 1 and Class 2 meters have similar design objectives, they differ in acceptance limits and temperature operational ranges. Specifically, Class 2 meters generally have equal or wider acceptance limits than Class 1 meters based on frequency:

Class 2 Sound Level Meter, also termed Type 2, meets the criteria set by IEC 61672-1:2013 for precision within a frequency range of 20 Hz to 8 kHz and a temperature scope of 0 to 40°C
Class 1 meters operate between temperatures of -10 and +50°C and capture frequencies from 16 Hz to 16 kHz.

BS EN 61672-1:2013

Frequency Analysys

MEMS Microphone

Noise Meter

Catalogue

SV 973A Type 2 Sound Level Meter

The new Type 2 Sound Level Meter introduces cutting-edge features including real-time frequency analysis, triggered audio recording, time-history logging, and advanced RT 60 and STIPA measurements. Additionally, with the dedicated sound level meter mobile app available for both iOS and Android devices, SV 973A can efficiently streamline noise-at-work sampling tasks, delivering rapid and accurate results. Leverage these capabilities to conduct precise noise level measurements with greater ease and efficiency.

Download Class 2 Sound Level Meter PDF

Type 2 Sound Level Meter

Features

Accuracy

How accurate is a Class 2 sound level meter?

A Class 2 sound level meter, as per BS EN 61672 standard , has an accuracy within a frequency range of 20 Hz to 10 kHz and linearity deviations of +/- 1.1 dB. Within these specifications, the SV 973A features two dB measurement ranges: one for sound level (30 dBA RMS to 129 dBA Peak) and another for sound exposure (45 dBA RMS to 141 dBA Peak). This versatility enables its use in various scenarios, such as workplace noise monitoring, environmental assessments, and building acoustics. Given its broad measuring capabilities and consistent accuracy, the Class 2 sound level meter is a valuable instrument for diverse sound measurement applications.

Frequency Analysis

What are 1/1 and 1/3 Octave and WAV Recording?

1/1 and 1/3 Octave analysis are used in sound level meters for detailed frequency-based identification of noise sources, while WAV recording captures actual noise samples for post-processing. The 1/1 and 1/3 Octave breakdowns offer precise frequency band readings, aiding in pinpointing specific noise sources. This data is pivotal for creating noise mitigation strategies and choosing the right hearing protection. Sound WAV recording, on the other hand, provides an actual audio snapshot of the environment, allowing for unattended noise identification and enriching sound time history. When analyzed in software applications, these WAV files enable accurate sound engineering calculations. Combining these tools, the Class 2 Sound Level Meter serves as a comprehensive device for both diagnosing noise issues and suggesting sound management and engineering solutions.

Digital Meter

How does the Basic Class 2 Sound Level Meter work?

The Basic Class 2 Sound Level Meter, SV 973A, functions by using an analog-digital converter (ADC) and time weightings to transform ambient noise into a digital signal, which is then displayed in decibels. Upon capturing the sound, the ADC converts the analog sound waves into a digital format, which is processed and displayed as a decibel reading on the device's screen. The device archives these readings in its 8GB memory, storing them as time histories with specified integration intervals. This allows users to track and review noise variations over extended periods. For a more detailed analysis, the stored data can be transferred to a PC and examined using the provided software application, presenting the information in various formats like graphs and tables. This granular insight into sound trends is instrumental for thorough environmental and workplace noise evaluations and interventions.

Class 2 vs. Class 1

What is the difference between Class 1 and Class 2 sound meter?

The primary distinction between Class 1 and Class 2 Sound Level Meters is their accuracy and operational range in terms of frequency and temperature. Class 1 meters, as defined by the IEC 61672 standard, operate with an accuracy of +/-0.8 dB within a frequency spectrum of 16Hz to 16 kHz. On the other hand, Class 2 meters maintain an accuracy of +/-1.1 dB between frequencies of 20 Hz to 8 kHz. Additionally, instruments like the SV 973A offer enhanced performance by ensuring precise measurements within a broader temperature window of -10 to 50°C.

Difference between Class 2 and Class 1 Sound Meter

Microphone

Why microphone is a critical component?

Class 2 Sound Level Meter Microphone is a critical component as it is responsible for capturing noise samples. In contrast to traditional condenser microphones, the MEMS (Micro-Electro-Mechanical Systems) microphone featured in our meter is notably shock-resistant and consumes less power. This energy efficiency extends the battery life to 38 hours and allows us to confidently offer a lifetime warranty. Importantly, these enhancements don't compromise the microphone's frequency range or accuracy, which still meet the Class 2 requirements outlined in the IEC 61672 standard.

Mobile Application

What is Class 2 Sound Level Meter APP?

A Sound Level Meter APP, specifically the Assistant PRO for iOS and Android, is a mobile application designed to extend and enhance the capabilities of devices like the Class 2 Sound Level Meter SV 973A. By connecting the SV 973A to the Assistant PRO app via a low-power Bluetooth® interface, users can remotely control the meter, access real-time noise measurement data, and even conduct specialized tests such as Speech Transmission Index for Public Address Systems (STIPA) or measure Reverberation Time (RT60) directly from their smart devices. The app provides a convenient platform for viewing and managing noise data, complete with features like real-time alerts when noise surpasses set thresholds. This integration ensures both versatile and vigilant noise monitoring, making it invaluable for comprehensive environmental sound assessments.

Auto Calibration

How do you calibrate a Class 2 Sound Level Meter?

To calibrate a Class 2 Sound Level Meter SV 973A, use an acoustic calibrator. Once the microphone is placed inside the calibrator, the meter will automatically detect the calibration signal and calibrate at two preset levels, 94 dB and 114 dB. This autocalibration streamlines the process by directly storing the results in the device's memory. An added advantage of the SV 973A is its capability to contrast current calibration data with prior results, helping monitor the microphone's stability over time. This drift tracking ensures that the sound meter consistently delivers accurate readings. By combining immediate field calibration with the ability to detect potential drift, the SV 973A stands out for its reliability and precision, especially in professional environments.

RT 60

What is the use of RT 60 with Class 2 Accuracy?

RT 60 with Class 2 Accuracy, or Reverberation Time Measurements, is crucial for assessing sound clarity and quality in environments such as classrooms. Reverberation time, often referred to as RT 60, is the time it takes for sound to decay by 60 dB after an abrupt termination. In classroom settings, optimal reverberation times are essential to ensure clear communication and effective learning. The Acoustical Society of America recommends that in smaller classrooms (up to 566 m^3), the RT 60 should not exceed 0.6 seconds in the 500 Hz to 2000 Hz octave bands, while in larger spaces, it should be no more than 0.7 seconds. By utilizing a Class 2 sound level meter, such as the SV 973A, schools can accurately measure their reverberation times and, if necessary, make adjustments using sound-absorbing materials to meet these standards. Such proactive measures ensure a conducive learning environment where speech intelligibility is maximized.

Accuracy

How accurate is a Class 2 sound level meter?

Frequency Analysis

What are 1/1 and 1/3 Octave and WAV Recording?

Digital Meter

How does the Basic Class 2 Sound Level Meter work?

Class 2 vs. Class 1

What is the difference between Class 1 and Class 2 sound meter?

Microphone

Why microphone is a critical component?

Mobile Application

What is Class 2 Sound Level Meter APP?

Auto Calibration

How do you calibrate a Class 2 Sound Level Meter?

RT 60

What is the use of RT 60 with Class 2 Accuracy?

Sound Meter

Applications

Occupational Noise Measurements

Class 2 Noise at Work Measurements

The Class 2 Sound Level Meter SV 973A is a crucial instrument for Occupational Noise Measurements, compliant with international standards from NIOSH SLM, OSHA, MSHA, ACGIH, and ISO. Able to measure up to 141 dB, it provides accurate data in various workplace noise situations. With its robust MEMS microphone, the SV 973A is designed for challenging occupational environments. Additionally, its user-friendly interface and complementary Supervisor PC software ensure seamless noise data management for professionals.

Class 2 Sound Measurements

Sound measurements in a frequency range to 10 kHz

Class 2 Sound Level Meters, like the SV 973A, accurately measure sound pressure levels up to a frequency of 10 kHz in accordance with the IEC 61672-1:2013 standard. Used in diverse settings such as schools, workplaces, and construction sites, these meters provide essential data for noise monitoring and management. They offer time-weighted measurements and average sound levels, and can apply various frequency weightings (A, C, Z) for comprehensive sound analysis, making them ideal for precision, reliability, and ease in both professional and environmental contexts.

STIPA in accordance with IEC 60268

Class 2 Speech Transmission Measurements

STIPA, as defined by IEC 60268, measures the intelligibility of public address and voice alarm systems in large venues. The Speech Transmission Index for Public Address systems ensures that announcements remain clear in places like airports, concert halls, and shopping centers. Adhering to the IEC 60268-16 standard, the STIPA method requires a sound level meter compliant with IEC 61672-1, such as the SV 973A Class 2 Sound Level Meter. To assist in conducting STIPA measurements, the Building Acoustics PRO mobile application supports the SV 973A, offering in-depth analysis and evaluation of the system's effectiveness.

Occupational Noise Measurements

Class 2 Noise at Work Measurements

Class 2 Sound Measurements

Sound measurements in a frequency range to 10 kHz

STIPA in accordance with IEC 60268

Class 2 Speech Transmission Measurements

Best Sound Level Meter

Videos

The Best Class 2 Sound Level Meter

Why the SV 973A is Best Class 2 Sound Level Meter?

Professional Type 2 Noise Meter

What are the features of Professional Type 2 Noise Meter?

Buy Sound Level Meter in the UK

Price

Class 2 Sound Level Meter

The kit consist of SV 973A Class 2 sound level meter equipped with a new robust MEMS microphone with a life-time warranty. The kit includes: SA 22 windscreen, SA 80 soft bag for the instrument, 8 GB built-in memory, four AAA batteries, USB-C cable, and a usb-stick with a user manual. Each SV 973A has its factory calibration certificate and 36 months warranty upon product registration.

See all accessories

SF973_1 - Firmware option to SV 973: 1/1 octave analysis

The firmware option to SV 973: 1/1 octave analysis

SF973_2 - Firmware option to SV 973: 1/3 octave analysis

The firmware option to SV 973: 1/3 octave analysis

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Technical

Specifications

Class 2 Sound Level Meter

Applications

Sound measurements
Occupational noise
Building acoustics

Hardware Features

Number of channels	1
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	3
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

Files

Downloads

Information Materials
Firmware & Software

Data Sheet

Declaration of Conformity

User Manual

Firmware