Engineers Quantify PSU Noise Levels in Detailed Acoustic Tests
Engineers have been examining the noise levels of a power supply unit (PSU), focusing on both fan noise and coil whine. The tests, conducted in a controlled environment, employed various tools to capture distinct aspects of the PSU's acoustic performance.
The team began by subjectively noting coil whine during live load tests. To quantify this, they used a non-intrusive laser tachometer to record the PSU fan's revolutions per minute (RPM) during operation. For a comprehensive understanding, noise levels were measured across the fan's RPM range using an Extech HD600 sound level meter.
To isolate and accurately measure fan noise, the PSU was tested separately with a custom-built fanless adjustable DC PSU. This setup, however, did not capture coil whine, as the PSU was not powered during acoustic testing. An oscilloscope was employed to visualize the coil white noise during voltage tests. The testing environment had a background noise floor of ~30.4 dB(A), with equipment noise becoming noticeable above 33.5 dB(A). Due to this, noise measurements could not be taken during load testing, as background noise from electronic loads and other equipment interfered.
The investigation into the PSU's noise levels involved meticulous testing, separating and measuring fan noise and coil whine. The team successfully quantified the PSU's acoustic performance across various conditions, providing valuable insights for further improvements.
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