Measurements and diagnostics
We measure to find a solution
We measure noise, sound insulation, reverberation and vibration to the standards – as an engineering assessment for a design, an expert opinion or diagnostics. Our goal is not the document but the solution: where the sound comes from, how much it has to drop and with what measure.
Do you need an official test report?
We do not issue accredited test reports. If you need a report for the Regional Health Inspectorate, the Regional Environmental Inspectorate or occupational health, contact an accredited inspection body directly. Our partner in projects with measurements is Spectri-Measurements – an inspection body accredited by the Bulgarian Accreditation Service (BAS).
Do you have a report showing an exceedance or an order to comply?
This is where we can help most. The report tells you how big the exceedance is, but not why it happens or how to fix it.
- Diagnostics – we find the source and the sound path: which machines, which side, which frequencies.
- Prediction – we calculate the reduction of each measure before any money is spent.
- Design and installation – noise barriers, enclosures, silencers, vibration isolation. We manufacture much of it ourselves.
- Control measurement before the repeat official inspection.
Solomed, Sofia – chillers next to a residential building. The official report showed 61.2 dB(A) at the dwellings against a limit of 55 dB(A). After the noise barrier, the repeat official measurement showed 55.0 dB(A) – within the limit.
Billa Trakia, Plovdiv – air-conditioning and refrigeration equipment below a residential block. 70.3 dB(A) outside the bedroom windows. Predicted after the measure – 53.7 dB(A); measured after installation – 54 dB(A).
Technical observer at an official measurement
If an official inspection is coming up, we can attend as a technical observer: checking that the operating mode of the machines, the points and the conditions follow the method. A wrong point or operating mode can cost you an exceedance that does not exist.
Types of measurement
Details of each type of measurement are on the pages below.
What we measure and to which standards
| Type | Purpose | Standard / regulation |
|---|---|---|
| Noise from premises to dwellings | Chillers, HVAC, machines, generators | Ordinance No. 6 of 2006 |
| Workplace noise | Workshops and plants – assessment and measures | Ordinance No. 6 of 2005 |
| Field sound insulation | Walls, floors, doors | EN ISO 16283; Ordinance No. 4 of 2006 |
| Reverberation and speech intelligibility | Halls, offices, classrooms | EN ISO 3382 |
| Field sound absorption | Finished linings, plasters | Sonocat sound intensity probe |
| Sound power and sound paths | Machines with steady noise, weak spots in partitions | Sound intensity, EN ISO 15186 |
| Vibration | Machines, gyms, structures | Digiducer 333D01 accelerometer |
| Dynamic stiffness | Resilient layers for floating floors | ISO 9052-1 |
| Studio analysis | Control rooms and mixing studios | EBU Tech 3276, ITU-R BS.1116 |
| Binaural recording | Before/after comparison by listening | HEAD acoustics SQope |
Equipment
- Brüel & Kjær 2245 sound level meter, class 1 to IEC 61672;
- Sonocat (Demcon) – sound intensity probe: in-situ sound absorption and sound power of steady noise sources;
- Digiducer 333D01 digital accelerometer;
- HEAD acoustics SQope binaural headset sensor;
- iSEMcon EMX-7150 measurement microphone and REW software – for studio analysis.
Frequently Asked Questions
Is your measurement valid for the health or environmental inspectorate? No. Official purposes require a report from an accredited inspection body. Our measurement shows the cause and leads to a solution.
Why measure with you if I will need an official report later anyway? Because the official measurement only records the situation. If we first find and solve the problem, the official measurement is done once – after the measures.
How much does it cost? It depends on the type and the number of points – write to [email protected] or call 0883 400 061.