A microphone set combines a measurement microphone capsule and preamplifier body that have been selected, characterised, and calibrated together as a matched pair. The calibration certificate documents the system sensitivity of the assembled set — not just the capsule in isolation — which is the value you use in your measurement uncertainty calculations. Buying a matched set removes the complexity of verifying capsule-preamplifier compatibility and matching calibration documentation from separate items.
Start with the standard or regulation that governs your measurement programme. Environmental noise monitoring to IEC 61672 Class 1 requires a Class 1 instrument chain — your microphone set must be Class 1. Occupational noise assessment to ISO 9612 also specifies minimum instrument class. If the standard specifies Class 2, buying a Class 1 set provides no benefit in terms of compliance — it only increases cost. Match the class to the requirement.
TEDS (Transducer Electronic Data Sheet) microphone sets store calibration data — serial number, model, sensitivity, and reference conditions — in a small memory chip inside the preamplifier body. Multi-channel DAQ systems and modern sound level meters can read this data automatically when the microphone is connected, eliminating the need to manually enter sensitivity values and reducing the risk of operator error in multi-channel deployments. If you are deploying 8 or more channels, TEDS sets pay for themselves in setup time saving and error prevention.
When evaluating competing microphone sets, compare the calibration certificate type as well as the headline specification figures. Two sets that appear identical on paper may have very different calibration documentation quality. A set supplied with an ISO/IEC 17025 accredited certificate with stated expanded measurement uncertainty is significantly more valuable for compliance and accredited testing work than one with only a factory QA/AC certificate — even if the acoustic specifications are identical.