Uniquely Yours
Custom Fashion wear Manufacturer

In our customization process, we value the communication of details with our clients to ensure a thorough understanding of your needs and expectations.

Uniquely Yours
Custom Fashion wear Manufacturer

In our customization process, we value the communication of details with our clients to ensure a thorough understanding of your needs and expectations.

Industrial Boundary Noise
ABOUTUS

Factories, workshops and processing plants are judged on the noise that crosses the property line — not the noise inside it. Measure at the boundary the way ISO 1996 expects, and you get a number that will actually hold up

explore ENVIRONMENTAL noise Instruments

The Property Line Is Where Compliance Is Judged 

A factory can run within every internal occupational limit and still fail its environmental permit if the sound crossing the fence line disturbs a neighboring home, school or hospital. Environmental noise assessment under ISO 1996-1 and ISO 1996-2 is built around exactly that distinction: what matters is the level at the boundary or at the nearest sensitive receptor, evaluated against the time of day.

Separate assessment periods under ISO 1996 — day, evening and night each carry their own limit

-6 dB

Typical drop in sound level each time distance from the source doubles, before ground and barrier effects

±0.7 dB

Approximate tolerance of a Class 1 instrument at reference conditions — the margin most permits assume

Three Stages of a Boundary Noise Program

Periodic Boundary Compliance Surveys

Routine spot-check readings at the property line or nearest receptor, taken during each relevant time period, to confirm the site is still within its permitted limit.
AWA5662 Multifunctional Sound Level Meter

1
Source & Frequency Diagnosis

When a reading is borderline or complaint-driven, 1/1 and 1/3 octave or FFT analysis identifies whether a tonal or low-frequency component from a specific machine is what's driving it — the detail a simple overall level can't show.

AWA6228A Noise and Vibration Analyzer

1
Extended Multi-Day Compliance Campaigns

Longer measurement runs across full day–evening–night cycles, capturing everything from a quiet 3 a.m. background to a daytime production peak on one instrument.
AWA6292 Multifunctional Sound Level Meter

1

Running a Boundary Noise Assessment

Step 1 Calibrate

Field-check against a Class 1 acoustic calibrator immediately before and after the session, as ISO 1996-2 field procedure expects.
Step 2 Position

Set up at the property boundary or the nearest sensitive receptor, at the height and distance the applicable standard or permit specifies.
Step 3 Log by Period

Record separately across the day, evening and night windows, screening for tonal or impulsive character that may need a correction.
Step 4 Report

Compare each period's result to its specific limit and export a time-stamped, audit-ready record referencing the applicable standard.

Class 1 Instruments for Every Stage of the Assessment

All three analyzers below are Class 1 under IEC 61672-1, IEC 61260-1 and IEC 61252 — the accuracy tier environmental compliance work is built around.

Common Questions About Industrial Boundary Noise

1. Should I measure at the property line or at the nearest house?

Whichever point the applicable regulation or permit specifies as the compliance point — commonly the property boundary, but sometimes the façade of the nearest sensitive receptor (a home, school or hospital). Measuring at the wrong point is one of the most common reasons a reading gets challenged.
2. Do I really need a Class 1 instrument for this?

Yes, in almost every case. Environmental compliance measurements — especially anything that could be disputed, submitted to a regulator, or used as evidence — are built around Class 1 accuracy. Class 2 is generally reserved for general workplace noise assessments, not boundary compliance.
3. Why does the same site have different limits for day, evening and night?

Background ambient noise naturally falls after dark, and people are more sensitive to disturbance while resting, so most regulations tighten the permitted level for the evening and night periods even though the source itself hasn't changed. ISO 1996-1 assesses each period separately for this reason.
4. What if the noise has a tonal or impulsive character?

ISO 1996-2 expects you to identify a distinct tonal component (a hum or whine) or an impulsive one (a repetitive clang or bang) using octave, 1/3-octave or FFT analysis, since these are typically more annoying than a steady broadband sound of the same overall level and can trigger an additional correction on top of the measured value.

Not sure which instrument fits your site?
We look forward to hearing from you.

phone-5 Tel: +86-19012832378

Contact Aihua Instruments


Uniquely Yours Custom Fashion wear Manufacturer

Uniquely Yours Custom Fashion wear Manufacturer

Industrial Boundary Noise ABOUTUS

Industrial Boundary Noise

Three Stages of a Boundary Noise Program

Periodic Boundary Compliance Surveys

Source & Frequency Diagnosis

Extended Multi-Day Compliance Campaign​s

Running a Boundary Noise Assessment

Class 1 Instruments for Every Stage of the Assessment

AWA6228A Noise & Vibration Analyzer

AWA5662 Multifunctional Sound Level Meter

AWA6292 Multifunctional Sound Level Meter

Common Questions About Industrial Boundary Noise

1. Should I measure at the property line or at the nearest house?

2. Do I really need a Class 1 instrument for this?

3. Why does the same site have different limits for day, evening and night?

4. What if the noise has a tonal or impulsive character?

Not sure which instrument fits your site?We look forward to hearing from you.

Uniquely Yours
Custom Fashion wear Manufacturer

Uniquely Yours
Custom Fashion wear Manufacturer

Industrial Boundary Noise
ABOUTUS

Extended Multi-Day Compliance Campaigns

Not sure which instrument fits your site?
We look forward to hearing from you.