ESA Certified Alarm Technician Practice Exam

For accurate measurements, where should a dB Meter be aimed?

1. Aiming at the ground

2. Aiming at a reflective surface

3. Aimed facing the sound source

4. Aiming at the nearest wall

The correct answer is: Aimed facing the sound source

The dB meter should be aimed facing the sound source for the most accurate measurements of sound intensity and level. This positioning captures the direct sound emitted from the source without interference or reflection from surrounding surfaces. When the microphone of the dB meter is directed towards the origin of the sound, it allows for a clear understanding of the sound pressure level being generated. Other aims, such as towards the ground or a reflective surface, could alter the readings due to reflections or absorption of the sound waves, which would not provide an accurate assessment of the source’s output. Aiming at the nearest wall could similarly introduce inaccuracies due to reflections, making it less effective for evaluating the sound level directly from the source. Thus, aiming the db meter directly at the sound source is crucial for obtaining precise and relevant measurements.