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Hello HP specialists and others ,

My 70001 mainframe has such powerfull fan's , (BEARINGS are OK!!!)
that the noise equals my Nilfisk Hoover (Brand name's , suppose you
all know what i want to point out)

Never had an instrument in my lab that has such a noisy fan.

Beeing designed for rack/industrial use, the noise is probably normal.

I noticed earlier 70001 instruments had NTC's to reduce the fan
voltage (and noise) , anybody has schematics or basic design that
was used ?
The printed circuit still has the unused space/circuit where the NTC
have to be located , I can see place for 2 ntc and 2 resistors (one
set for each fan ) and 1 in front probably for extra safety that used
to be there in earlier design .

The 70004 display mainframe that can be used together with the 70001
is designed very very silent ...

Many thanks,
Erik

On Wed, 6 Dec 2006, ericapple2004 wrote:

Hello HP specialists and others ,

My 70001 mainframe has such powerfull fan's , (BEARINGS are OK!!!)
that the noise equals my Nilfisk Hoover (Brand name's , suppose you
all know what i want to point out)

Never had an instrument in my lab that has such a noisy fan.

Beeing designed for rack/industrial use, the noise is probably normal.

Many years back I had a Sun 2 (2/120?) server in the lab, that
really took some beating. it was about 12" wide, 24" deep and 36"
high, and fitted with (IIRC) thirteen 5" fans, six in the power
supply alone. It was noisier than being in a tube train on the
Circle Line!

--
Geoff Blake G8GNZ located near Chelmsford, Essex, U.K.
Please reply to: geoff (at) palaemon (dot) co (dot) uk
Using Linux on Intel & Linux or NetBSD on Sun Sparc platforms

Please avoid sending me Word or PowerPoint attachments.
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