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HP3326A Noisy fan

 

I have an HP3326A with a very noisy fan. It doesn't sound like the motor has
bad bearings or anything else. Just lots of air noise. It is a lot louder
than other HP gear that I have.
Is there any cure for this? Is it a good idea to slow the fan down in this
generator?

Thanks
Gary K4FMX
 

Hi Gary,

I had a similar problem with a HP5335A counter. What I did was to design a circuit board and place 10 series resistors on it, each 15 ohm, 0.25 W. These resistors were placed in series with the DC fan. I mounted the board inside the unit on the right side with four screws.
Perfect, nice and quiet.

G?ran

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