Output
Waveform; spectrum; digital dBFS; local clip
UserBenchmark / All Tools / Noise Spectrum Test
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Noise Spectrum Test
Inspect the frequency spectrum of recorded computer noise. A spectrum cannot identify a faulty component by itself.
Free to useNo downloadNo sign-up
Noise Spectrum Test · At a glance
Quick answer: Inspect the frequency spectrum of recorded computer noise. A spectrum cannot identify a faulty component by itself. A narrow peak shows energy at a frequency, not the identity of a component.
Noise Spectrum Test
The test loads when you open it. Device access is requested only after you choose to start.
Detailed guide
How to use this tool
- Place the microphone at a repeatable distance and inspect the spectrum while the computer state is steady.
- Record a local clip for comparison.
Input
Microphone permission and an input device
Browser requirement
HTTPS; getUserMedia; Web Audio
Processing
Runs on your device; no tool-result upload
How it works and what the result means
Signal level is shown in dBFS, where 0 is digital full scale. It is not a calibrated sound pressure reading. The noise floor is the lowest observed level, not a laboratory SNR measurement.
Reading the result
A narrow peak shows energy at a frequency, not the identity of a component. Fans, power electronics and room sources can overlap.
What to check next
Keep gain and microphone location fixed. Avoid moving the microphone near running fans or touching powered components.
Use HTTPS or localhost, check the selected operating-system input, and close applications that hold the microphone. Stop releases microphone access; recordings remain in your browser.
Frequently asked questions
Can the spectrum identify a failing power supply?
No. A spectral peak cannot diagnose a component or electrical fault. The tool is a browser noise-observation aid.
How do I start the Noise Spectrum Test?
Start the microphone, approve access, and speak at a normal level. Watch the waveform and spectrum. Use Record and Finish recording to listen to a local clip.
Does this tool require a download or an account?
No. Open the interactive tool above in a modern browser. The instructions and explanations are available even with JavaScript disabled; running a test needs JavaScript.
Why can two attempts give different results?
Power settings, background tasks, browser scheduling, operating-system input processing and device settings affect measurements. Compare repeated attempts with identical settings rather than the single highest score.