Checking a meter’s calibration is good practice and for many applications it is essential. Most regulations demand that the meter is verified before making measurements. Records should be kept of this as evidence that the correct procedures have been followed.

A Calibrator should meet the standard IEC 60942 to either Class 1 or Class 2. The Class 1 calibrator is a little more accurate than the Class 2. In general, if you have a Class 1 (or Type 1) Sound Level Meter then you should use a Class 1 Calibrator. If you have a Class 2 Sound Level Meter you can use either a Class 2 or Class 1 Calibrator.

Using the Tenmars ST-120 Class 1 Sound Level Meter Calibrator

 

The Tenmars ST-120 Class 1 Sound Level Meter Calibrator is a hand-held device that emits an audible tone of very accurate level and frequency and is used before making sound measurements.

The Calibrator is fitted over the meter’s microphone and the reading is either checked manually by the user or automatically by the meter.

The TM-120 meets the standard IEC 60942 Class 1. The Class 1 calibrator is more accurate than the Class 2 calibrators.

In general, if you have a Class 1 (or Type 1) Sound Level Meter then you should use a Class 1 Calibrator. If you have a Class 2 Sound Level Meter you can use either a Class 2 or Class 1 Calibrator.

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