Choosing Class 1 Sound Level Meter

Choosing a Class 1 sound level meter is not just about specifications. Today’s top meters from manufacturers such as HBK, NTi, Rion, Norsonic, and Svantek (SV 971A, SV 977D, and SVAN 979) all comply with IEC 61672-1:2013, hold type approval, and deliver trusted results for professional applications. They share the same core acoustic functions: each model provides a single input channel for precise sound measurements, supports A, C, and Z frequency weighting, Fast/Slow/Impulse time weighting, and offers octave analysis as standard or option.

Key Takeaways

When selecting a Class 1 sound level meter, focus on:

Broadband measurement range (not just filter range)

Clear definition of linearity and compliance with IEC 61672

Transparent, auditable and understandable documentation

Taking the time to dig into the details ensures your investment delivers not only technical compliance, but practical confidence in every measurement and report.

A Practical Comparison of SV 971A, SV 977D, and SVAN 979

All three are true Class 1 meters with similar acoustic features and one input channel, but only SV 977 and SVAN 979 add built-in support for vibration (IEPE) sensors. What sets these meters apart—and guides your decision—is not so much the measurement algorithms or legal status, but rather the form factor and the flexibility of the input channel.

The SV 971A stands out with its ultra-compact, pocket-friendly housing, purpose-built for sound measurements only.

Both the SV 977 and SVAN 979 use a classic handheld format and, crucially, allow you to switch the input from a measurement microphone to an IEPE accelerometer—covering not just noise, but also vibration measurements with one instrument.

The right choice depends on how much you value portability and whether your projects demand both sound and vibration measurement in one device.

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Who Should Choose Each Meter?

SV 971A

For everyday professionals who value mobility and battery life

The SV 971A is Svantek’s best-selling sound level meter of all time, thanks to its ultra-compact size and long operating time on standard AAA batteries. This model connects easily to a mobile app, allowing users to view large data sets and reports on their phone or tablet. It’s a favorite among acoustic consultants, health and safety managers, noise policy officers, and is increasingly popular in the audio-video and R&D sectors for its portability. Because of its small size and robust performance, the SV 971A is even used in space missions—proving its versatility far beyond typical industrial or environmental noise surveys.

SV 977D

For those who want versatility, larger display, and occasional vibration or outdoor measurements

The SV 977 features a larger, clearer screen—ideal for users who prefer viewing real-time spectra directly on the meter. Like the 971A, it also works seamlessly with mobile apps, but stands out by offering a unique extended high-frequency range (ultrasound option) and the ability to measure vibration with an IEPE accelerometer. This makes it especially popular with building acoustics consultants and users who occasionally require vibration analysis. With its outdoor case option, the SV 977 is well-suited for unattended outdoor monitoring (including remote access via 4G modem) and can be integrated with automation systems via RS232, making it a solid choice for automated noise monitoring on production lines.

SVAN 979

For advanced professionals, agencies, and R&D needing the ultimate in precision and analysis

The SVAN 979 is the global flagship for Class 1 meters when it comes to technical specification. It boasts an industry-leading low noise floor (as low as 12 dBA), supports external 200V-polarized microphones, and offers advanced tools for tonality, loudness, and 1/6- and 1/12-octave analysis. This instrument is designed for demanding professional consultants and environmental monitoring agencies who need the most comprehensive analysis suite. The SVAN 979 is often chosen by government bodies and labs because it combines all the features of the 971A and 977, but with broader measurement ranges and virtually all advanced functions activated out of the box, with no extra licensing required.

Key Technical Specifications and Compliance at a Glance

Feature / Model	SV 971A	SV 977D	SVAN 979
Compliance / Type Approval	IEC 61672-1:2013 Class 1 Type approved	IEC 61672-1:2013 Class 1 Type approved	IEC 61672-1:2013 Class 1 Type approved
Frequency Range	5 Hz – 20 kHz	3 Hz – 20 kHz (sound) up to 40 kHz (ultrasound option)	3.15 Hz – 20 kHz (sound) up to 25.6 kHz (FFT option)
Total Measurement Range	17 dBA Leq – 140 dB Peak	16 dBA Leq – 140 dB Peak	12 dBA Leq – 140 dB Peak
Communication Interfaces	USB-C, Bluetooth®	USB, Bluetooth®, RS232, options: GPS, Ethernet, Wi-Fi, 4G	USB, Bluetooth®, RS232, options: GPS, Ethernet, Wi-Fi, 4G
Display Size	1.2″	2.4″	2.4″
Weight	225 g	600 g	600 g

Which Meter for Which Application?

All three Svantek meters are fully capable for both indoor and outdoor noise measurements; the key is matching the model to your specific needs.

Routine factory surveys (e.g., ISO 9612), school or office checks, short environmental spot checks:
Most measurements focus on Leq and Peak with 100 ms–1 s logging. The SV 971A is sufficient here – compact, quick to deploy, and cost-effective. For spot environmental checks requiring statistics or 1/3-octave bands, any model works, but software cost is lowest with the 971A.
Ultrasound or high-frequency noise (compressed-air leaks, machinery > 20 kHz):
The SV 977D is the clear choice, equipped with an ultrasound option and ¼″ microphone. Neither the 971A nor the 979 reaches these frequencies natively.
R&D teams:
Where advanced acoustic analysis, multi-channel measurement, or strict compliance matters, the SVAN 979 is ideal. If tasks are limited to straightforward Leq or SPL, the 971A or 977D may suffice; for full flexibility and analysis power, choose the 979.
FFT analysis:
FFT is most valuable for vibration work, not standard sound checks. For detailed vibration analysis, both the 977D and 979 support FFT with the right accelerometer and software.
Building acoustics (ISO 16283):
All three meters comply. If you want real-time spectra on a larger display or occasional vibration monitoring, the 977D is the versatile pick.
Long-term, high-resolution noise and vibration monitoring / advanced research:
With a 12 dBA noise floor and frequency range down to 3.15 Hz, the SVAN 979 is unrivalled. It serves R&D teams, agencies, and code testers needing automation, multi-point measurements, and detailed post-processing without extra software exports.
High-level noise:
To measure very high levels (≈ 160 dB Peak), the SVAN 979 with an attenuator and ¼″ microphone is best.
Vibration:
Both SV 977D and SVAN 979 can switch from mic to IEPE accelerometer (ISO 20816) for ground-borne vibration, machinery health, and simultaneous noise + vibration reports.
Advanced building acoustics:
SVAN 979, with four-channel support, automated ISO 16283 workflows, and advanced frequency analysis tools, is ideal for façade tests, sound insulation, and detailed product research.

What About Price?

When choosing a Class 1 sound level meter, it pays to compare total cost, not just headline specs. The price of each meter depends on configuration and options, but the differences reflect both capability and included features:

SV 971A: from €2,500 to €5,000

The best-selling, most affordable option. Even fully loaded with advanced features (like building acoustics or octave analysis), it remains the most budget-friendly way to access true Class 1 performance in a pocket-sized meter.

SV 977D: from €4,000 to €7,000

The versatile all-rounder. The price grows as you add vibration, ultrasound, and automation options—ideal for those who need flexibility to cover both noise and vibration jobs.

SVAN 979: from €7,000 upwards

The flagship platform. Although it’s the highest initial investment, the 979 typically comes with most advanced features pre-installed. For professionals who need the broadest measurement range and full analysis tools out of the box, it’s the most cost-effective “all-in-one” over the long run.

Not All Specs Are Created Equal: What to Look for in a Class 1 Sound Level Meter

When comparing Class 1 sound level meters for professional or regulatory use with Norsonic, NTI, RION, Bruel & Kjaer or others, it’s essential to look beyond marketing numbers and understand what really matters in practice. Published specifications often use different terminology and measurement conventions, which can lead to confusion—or worse, an instrument that’s not truly suited for your needs.

Frequency Range: Filters vs. True Broadband Measurement
A common pitfall is to take the “frequency range” at face value. In sound level meters, frequency range can refer to two different things:

Filter frequency range (for octave/third-octave analysis) – Often, the widest numbers on the spec sheet refer only to the filters used for spectrum analysis.
Broadband measurement range (for Leq, Peak, etc.) – This is the actual range over which the meter can deliver accurate, compliant wideband results.

Why it matters:
For applications like building acoustics, infrasound, or specialized environmental monitoring, it’s vital to confirm that the broadband range—not just the filter range—matches your requirements. Always ask: “Is the stated frequency range valid for wideband Leq and Peak, or just for the spectral analysis filters?”

Dynamic Range and Linearity: Understanding the Numbers
Every compliant Class 1 meter will list a “dynamic range” or “noise floor,” but not all manufacturers present this in the same way. The most reliable specification details:

The minimum measurable level (noise floor) and the maximum Peak level.
The IEC 61672 linear operating range—the span over which measurements are guaranteed accurate, with the required margin from noise floor as defined by the standard.

Why it matters:
For compliance, low-level noise testing, or high-impact environments, knowing the true linear range (not just the absolute minimum or maximum) helps ensure your data is both valid and defensible.

Total Transparency and Documentation
Trustworthy documentation includes:

Explicit statements about the measurement range for each parameter (not just “typical” or “approximate” values).
Full details on filter types, weighting networks, and available time constants.

Why it matters:
Clear, detailed documentation allows you to match the meter to your precise needs and audit your measurements if challenged. This is especially important for regulatory, legal, or consulting work.

Software: Workflow and Cost-of-Ownership
Sound level meters today are as much about data management as hardware specs. Look for:

Included software that supports batch processing, report generation, and advanced analysis.
Clarity on which software features are standard and which require extra licenses or payment.

Why it matters:
A meter that’s easy to integrate into your workflow—without hidden costs or limitations—will save time and reduce frustration over the long term.

An authorized SVANTEK consultant will help You with the details such as the required accessories for your noise monitoring task.

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Class 1 Sound Level Meter – SV 971A

10 June 2025

Type Approval for SV 971A
by the Central Office of Measures

13 March 2025

SV 971A Receives Type Approval in Austria

29 January 2025

SV 971A received the China Pattern Approval

19 November 2024