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| Keysight 34461A Fan Noise |
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| iMo:
Cut the fan's Vcc wire, insert a 100-220ohm pot trimmer and adjust such it runs without the disturbing sound.. Replace with a 1W resistor afterwards. It could be the fan's rpm/air_volume is not linear and the fan is running too fast without good reason.. PS: replacing the original fan with a different XYZ one could have the same air pressure result as lowering the rpm (with help of the resistor) with the original one.. |
| Gandalf_Sr:
Does the 34461A need a 5V or 12V fan? The Noctua NF-A4x10 5V is a 5V fan but you guys are talking about cutting "the 12V wire". |
| iMo:
I fixed "12V" above, no idea what fan's Vcc is in 34461. In my 34401 the fan's Vcc is 0V. :) Decades back my first job with building a new PC was cutting the fan's wires with all fans in the box :) Ideally do set the rpm with the trimmer (at the highest Tamb expected) such the measured external ref voltage will not change while the fan's noise is minimal. A nice Sunday's afternoon exercise :) |
| HighVoltage:
Almost all my HP / Agilent / Keysight gear with a fan have received a 100 Ohm (1W) resistor in line with the power cable. The fans still turn fast enough for good airflow and the annoying noise is gone. And as a side effect, the fans will last many more years. |
| iMo:
--- Quote from: HighVoltage on December 08, 2019, 02:45:44 pm ---Almost all my HP / Agilent / Keysight gear with a fan have received a 100 Ohm (1W) resistor in line with the power cable. --- End quote --- .. with the fan's Vcc wire.. :) |
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