[time-nuts] time-nuts Digest, Vol 58, Issue 45

[Pierre-François (f5bqp_pfm)]

Hello Roy,

Yes these fans from these old mummies are really too noisy.
I've several counters: two EIP 578, this 5370B and an ADVANTEST 5372P, the 
quietest is really the ADVANTEST.
I've also a bunch of other T&M intruments and it's impossible to have all of 
these up and running. Really too noisy.
I've no idea yet but I need to find a solution except having some gum into 
the ears... ;-))

Best 73's
pf, F5BQP



>
> Message: 5
> Date: Wed, 20 May 2009 10:16:07 +0100
> From: "Roy Phillips" <phill.r1 at btinternet.com>
> Subject: Re: [time-nuts] 5070B once more....
> To: "Discussion of precise time and frequency measurement"
> <time-nuts at febo.com>
> Message-ID: <B37F9EDC6EC14ABE85EF661FE2AE57E7 at LapTop>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> Hello Pierre-Fran?ois
> A point of personal interest in your email  - -  The noise of the fan in 
> the
> 5070B, this would appear to be a problem with a number of the older items 
> of
> Hewlett Packard, and other manufacturers.
> The items are usually  fitted with a Papst fan,with a high throughput of 
> air
> running from the power line.  Has anybody tried to replace these fans with 
> a
> more modern type (12/24 volt). I'm sure the designers were being very
> proper, but I cannot believe that a counter should require such a large
> volume of air moving through it ? I have an EIP 545 Counter and an HP 
> 5335A
> which both have Papst fans and are very noisy
> Any ideas on this.
> Roy
>