Products > Test Equipment
Keysight 34461A Fan Noise
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.. :)
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version