Sound level meter calibration
Sound level meters and analysers we calibrate
- Brüel & Kjær (HBK) — including the 2250, 2270 and 2245 families
- Norsonic — Nor131, Nor140, Nor145, Nor150 and earlier models
- Rion — NL-42, NL-52, NL-62 and the NA analyser series
- Svantek — SVAN 971, 977, 979 and related models
- 01dB (Acoem) — Fusion, Cube, Solo
- Larson Davis (PCB Piezotronics) — 831, 831C, SoundTrack LxT
- Casella, Cirrus Research, NTi Audio, Pulsar Instruments, Ono Sokki, Sinus Messtechnik and Wölfel
- General-purpose and Class 2 meters from Extech, PCE, Testo, Delta OHM and similar makers
We are not an authorised service centre for any of these makers and have no commercial relationship with them. Calibration is performed against the standard, not against a manufacturer's procedure, so the make matters far less than the class of the instrument. If yours is not listed, ask — the list is what we see most, not a limit.
Periodic testing to IEC 61672-3, verifying conformity to the IEC 61672-1 specification for Class 1 and Class 2 instruments. This service is inside our accredited scope. We calibrate multi-brand: the meter does not have to have been bought from us, because we do not sell meters.
What is checked
- Acoustic signal tests at the calibration check frequency
- Self-generated noise
- Frequency weightings A, C and Z
- Time weightings F, S and I
- Level linearity across the operating range
- Toneburst response
- Overload indication
- Long-term stability against the previous certificate where available
Included at no extra charge
Incoming condition check, battery and power check, cleaning, fault diagnosis and a firmware check. If we find a fault we quote the repair before doing anything, and recalibrate after repair.
Accredited parameters and measurement capability
| Parameter | CMC (±) |
|---|---|
| Indication at the calibration check frequency | 0.12 dB |
| Self-generated noise | 0.060 dB |
| Electrical signal test of frequency weightings | 0.13 dB |
| Frequency and time weighting at 1 kHz | 0.13 dB |
| Long-term stability | 0.10 dB |
| Level linearity on the reference level range | 0.14 dB |
| Level linearity including the level range control | 0.14 dB |
| Tone burst response | 0.14 dB |
| Peak C sound level | 0.13 dB |
| Overload indication | 0.13 dB |
| High level stability | 0.10 dB |
Service
- Method
- IEC 61672-3
- Classes
- Class 1, Class 2
- Standard lead time
- 10 working days from receipt
- Express service
- Available on request, subject to laboratory schedule — quoted at booking
- Loan instrument during calibration
- On request, subject to availability