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Examoogle • User • info@examoogle.com • EE-2024-8821
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For noise measurement which instrument is used?
Tongue meter
Spirit level
Filler test kit
Wide band
Wide band
Quick Summary: A wide-band noise meter is the standard instrument used to measure overall noise levels across a broad frequency spectrum. It calculates the total sound pressure level by integrating signal components across the entire audible range.
A wide-band noise meter is the standard instrument used to measure overall noise levels across a broad frequency spectrum. It calculates the total sound pressure level by integrating signal components across the entire audible range.
Lp=20log10(p0p) — Sound Pressure Level in dB
Prms=T1∫0T[p(t)]2dt — Root Mean Square value of pressure
The instrument employs a microphone to convert acoustic pressure into electrical signals, which are then passed through a wide-band filter that permits a large frequency range to pass. An RMS detector determines the effective value of the signal, which is displayed on a calibrated scale usually in Decibels (dB).
Wide-band meters capture the total energy of noise across audible frequencies.
The standard reference pressure p0 is 20μPa.
Measurement is typically weighted using 'A-weighting' (dBA) to mimic human hearing.
Provides a simple overall noise metric.
Real-time monitoring capability.
Does not provide frequency-specific data.
Masks dominant frequency components within the noise spectrum.
Industrial safety and workplace monitoring.
Environmental noise pollution surveys.
Tongue meter (or clamp meter) is used for current measurement.
Spirit level is used for measuring surface horizontal or vertical alignment.
Filler test kit is often related to oil testing (e.g., dielectric strength) in transformers.
D is correct — A wide-band noise meter is the specialized instrument utilized to aggregate and measure total sound pressure levels across a broad frequency range.
Always distinguish between broad-spectrum noise meters and frequency analyzers; the former gives a total magnitude, while the latter breaks noise down into octave bands for troubleshooting resonance.