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| Silly tread |
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| floobydust:
It sounds like SMPS whistle, my wild guess is from the data center's power supplies (wiring) or UPS. Does it use a 380VDC bus? I use a battery-powered audio amp with a pick-up coil, or an AM radio and look for the noise source. Do a walk around and see what can be found. |
| 001:
--- Quote from: tpowell1830 on November 28, 2018, 07:19:12 pm ---Have you measured this frequency, it sounds much higher than 1 khz. --- End quote --- I can`t do this since signal is muddy and squeak is masked by others :-// It include some HF harmonics too |
| 001:
--- Quote from: floobydust on November 28, 2018, 07:20:08 pm ---It sounds like SMPS whistle, my wild guess is from the data center's power supplies (wiring) or UPS. Does it use a 380VDC bus? --- End quote --- Can You say about some standard ways to eliminate it? --- Quote from: floobydust on November 28, 2018, 07:20:08 pm --- I use a battery-powered audio amp with a pick-up coil, or an AM radio and look for the noise source. Do a walk around and see what can be found. --- End quote --- Yea whistle is everywere |O |
| chris_leyson:
Damn, I AM old, I really can't hear the squeak. Floobydust has the right idea. A pickup coil and a battery powered audio amp might offer a few clues, I would sniff the mains cables first and if an audio amp doesn't pick up anything then try using an AM radio. Common mode interference coming from your mains supply will find a way across any transformer at some frequency or another. |
| 001:
--- Quote from: chris_leyson on November 28, 2018, 08:41:12 pm ---Damn, I AM old, I really can't hear the squeak. --- End quote --- I`m not a boy too. But I feel it as headache. I cant say how it high but I know what it exist UPD after about hour of squeak audition it seems to me what I can hear it directly, without any electronics now |O |
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