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HP Boat Anchor Fans

Discussion in 'Electronic Design' started by John Devereux, Jul 23, 2013.

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  1. Hi,

    Has anyone tried replacing the fans of some of the older HP test gear?

    They make a lot of noise, can't help thinking there are better - or at
    least quieter - ones to be found thanks to the PC market.
  2. Phil Hobbs

    Phil Hobbs Guest

    Most of the ones I've taken apart are 120V.


    Phil Hobbs

    Dr Philip C D Hobbs
    Principal Consultant
    ElectroOptical Innovations LLC
    Optics, Electro-optics, Photonics, Analog Electronics

    160 North State Road #203
    Briarcliff Manor NY 10510

    hobbs at electrooptical dot net
  3. I am approaching that level of excess, if you include some Tek and
    Keithley stuff too :)
    I guess I must have a mixture, but all pre-agilent stuff.

    With computers, IME the fans tend to get quieter as they get bigger
    (larger diameter). Most of the noise on the HP fans sounds to me more
    like the motor or bearings. Rather than air movement. A moaning sort of
    whine, rather than a whooshing.
    Oh yes I can see that too!
  4. A collegue of mine changed the fan on the E36xx series. Or rather he just added a control to shut it off if it was running cold (why they did not add that it the first place I don't know). AFAIC he had to add special circuitry since it would detect fan failure.

    Most HP gear is great, but some are funny like the fan operation. Other special features, like that on the HP33120A function generator it is not possible to turn the output off. And that duty cycle is limited from 20 to 80%. Tsk tsk..


  5. hamilton

    hamilton Guest

    I am sure HP is like any other big company.

    When engineering is finished with it and throws is over to
    manufacturing, things will get changed.

    "Oh, this cheaper fan will be fine".

    And a fan will not get pushed back to engineering for re-evaluation.


    .. AFAIC he had to add special circuitry since it would detect fan failure.
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