Sound level meter calibration
ISO/IEC 17025 accredited
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
- Provided with your quotation
- Loan instrument during calibration
- On request, subject to availability