Message: 1
Date: Wed, 20 May 2009 03:01:41 -0700
From: "John Miles" <[email protected]>
Subject: Re: [time-nuts] 5070B once more....
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
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
The 5370 counters are unusually power-hungry, at about 160 watts for my
5370B. The airflow through the instrument is where the noise is coming
from, not so much the fan itself (try powering the fan up outside the
counter, holding it in your hand, and it'll be much quieter). Can't speak
for EIP but I don't think it's a good idea to alter the factory airflow
specs on HP gear, in most cases.
Now I'm wondering which software I could use to grab data from it to the
PC
and then to analyze the buffers to see the stability of my rubidium
source synchronised with the 1pps coming from the GPS.
I'm not sure it's possible to make continuous stability measurements
(Allan
deviation, etc.) directly with a 5370 since they don't support
running/overlapped measurements between readings. If you can work with a
1-pps output and can provide a divider for your reference, it can be done
with a picket-fence technique (e.g.
http://horology.jpl.nasa.gov/papers/picket_uffc.pdf ) which I haven't
tried
yet.
If anyone thinks it might be worthwhile, I could throw together a GPIB app
to implement Greenhall's paper for the 5370B with a Prologix or NI
board...
but my guess is that most people have been using other gear for that sort
of
thing.
-- john, KE5FX
------------------------------
Message: 2
Date: Wed, 20 May 2009 13:38:35 +0200
From: Pierre-Fran?ois (f5bqp_pfm) <[email protected]>
Subject: Re: [time-nuts] time-nuts Digest, Vol 58, Issue 45
To: <[email protected]>
Message-ID: <019c01c9d93f$83235e30$4501a...@r44>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi Ulrich,
Yes I'm frenchy but I use an NI USB/GPIB adaptor I've since a while, not
this exotic ALCIOM...
Best 73's
pf, F5BQP
Message: 4
Date: Wed, 20 May 2009 11:07:26 +0200
From: "Ulrich Bangert" <[email protected]>
Subject: Re: [time-nuts] 5070B once more....
To: "'Discussion of precise time and frequency measurement'"
<[email protected]>
Message-ID: <6d592d27dbe9444a97bf20f5fc2fc...@athlon>
Content-Type: text/plain; charset="us-ascii"
Pf,
I've on a
dedicated PC (XP) a GPIB/USB adapter for this application.
Could you tell me which sw I could use to do this?
since you own a French callsign chances are that you are talking about
the
SMART488 from ALCIOM. In this case I have no help available. Should you
however talk about a Prologix interface or a National Instruments
interface,
then EZGPIB may be helpful to you. Just google for the name to learn more
about it.
73s and my best regards
Ulrich DF6JB
------------------------------
Message: 3
Date: Wed, 20 May 2009 13:45:08 +0200
From: Pierre-Fran?ois (f5bqp_pfm) <[email protected]>
Subject: Re: [time-nuts] time-nuts Digest, Vol 58, Issue 45
To: <[email protected]>
Message-ID: <019f01c9d940$6d4320e0$4501a...@r44>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
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" <[email protected]>
Subject: Re: [time-nuts] 5070B once more....
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Message-ID: <b37f9edc6ec14abe85ef661fe2ae5...@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
------------------------------
Message: 4
Date: Wed, 20 May 2009 12:46:43 +0100
From: Luis Cupido <[email protected]>
Subject: [time-nuts] 5370B yet again
To: Discussion of precise time and frequency measurement
<[email protected]>
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi,
I do have a HP5335A and after the many comments
about the 5370 I'm curious if there is something
I'd be better off with the 5370 instead of my 5334
I've read the specs of both but... better ask
the experts ;-)
Luis Cupido.
ct1dmk.
------------------------------
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