Frequency Plots
10% Fan Speed
- Ignore the 50 Hz spike. This is noise coming from the mains grid. The next significant spike is at 100 Hz.
25% Fan Speed
- The 100 Hz and 200 Hz frequencies stand out.
50% Fan Speed
- Peak frequency: 500 Hz
75% Fan Speed
- Peak frequency: 800 Hz
100% Fan Speed
- Peak frequency: 800 Hz.
- Notable spikes: 250 Hz, 315 Hz
Signal Recordings
I have recorded the signals shown above, but please keep in mind that I’ve enabled Automatic Gain Control (AGC) to do so to make it easier for you to reproduce them. The provided recordings are only offered for aural identification purposes.
10% Fan Speed
25% Fan Speed
50% Fan Speed
75% Fan Speed
100% Fan Speed
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