Frequency Plots
| Fan / Pump Speed (PWM) | Peak Frequency |
|---|---|
| Fan 20% | 400 Hz |
| Fan 30% | 400 Hz |
| Fan 40% | 400 Hz |
| Fan 50% | 400 Hz |
| Fan 60% | 400 Hz |
| Fan 70% | 400 Hz |
| Fan 80% | 630 Hz |
| Fan 90% | 500 Hz |
| Fan 100% | 800 Hz |
| pump 50% | 800 Hz |
| pump 75% | 1 kHz |
| pump 100% | 1 kHz |
20% Fan Speed
- Peak frequency: 400 Hz
30% Fan Speed
- Peak frequency: 400 Hz
40% Fan Speed
- Peak frequency: 400 Hz
50% Fan Speed
- Peak frequency: 400 Hz
60% Fan Speed
- Peak frequency: 400 Hz
70% Fan Speed
- Peak frequency: 400 Hz
80% Fan Speed
- Peak frequency: 630 Hz
90% Fan Speed
- Peak frequency: 500 Hz
100% Fan Speed
- Peak frequency: 800 Hz
50% Pump Speed
- Peak frequency: 800 Hz
75% Pump Speed
- Peak frequency: 1 kHz
100% Pump Speed
- Peak frequency: 1 kHz
Signal Recordings
I’ve recorded the signals shown above, but please note that I’ve enabled Automatic Gain Control (AGC) to facilitate their reproduction. The provided recordings are intended for aural identification purposes only.
20% Fan Speed
30% Fan Speed
40% Fan Speed
50% Fan Speed
60% Fan Speed
70% Fan Speed
80% Fan Speed
90% Fan Speed
100% Fan Speed
50% Pump Speed
75% Pump Speed
100% Pump Speed
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