[time-nuts] time-nuts Digest, Vol 58, Issue 46

Wed May 20 16:34:47 UTC 2009

Hi John and the group,

Yes you're right modifying the airflow of these old mummies isn't a good 
idea, their "life" and reliability will be reduced drastically.

Thanks for the paper you pointed to on Greenhall, I'll read very carefully 
to it.

It would have been good to be able to do Allan deviation technics with the 
5070 as this gear is so popular.
Too  bad it's not possible...
Yes it would be good to have this Greenhall implemented for the 5370, 
building a divider is pretty simple.

Best 73's
pf

>
> Message: 1
> Date: Wed, 20 May 2009 03:01:41 -0700
> From: "John Miles" <jmiles at pop.net>
> Subject: Re: [time-nuts] 5070B once more....
> To: "Discussion of precise time and frequency measurement"
> <time-nuts at febo.com>
> Message-ID: <PKEGJHPHLLBACEOICCBJGEEKBFAC.jmiles at pop.net>
> 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) <pfmonet at wanadoo.fr>
> Subject: Re: [time-nuts] time-nuts Digest, Vol 58, Issue 45
> To: <time-nuts at febo.com>
> Message-ID: <019c01c9d93f$83235e30$4501a8c0 at 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" <df6jb at ulrich-bangert.de>
>> Subject: Re: [time-nuts] 5070B once more....
>> To: "'Discussion of precise time and frequency measurement'"
>> <time-nuts at febo.com>
>> Message-ID: <6D592D27DBE9444A97BF20F5FC2FCF75 at 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) <pfmonet at wanadoo.fr>
> Subject: Re: [time-nuts] time-nuts Digest, Vol 58, Issue 45
> To: <time-nuts at febo.com>
> Message-ID: <019f01c9d940$6d4320e0$4501a8c0 at 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" <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
>>
>
>
>
>
>
> ------------------------------
>
> Message: 4
> Date: Wed, 20 May 2009 12:46:43 +0100
> From: Luis Cupido <cupido at mail.ua.pt>
> Subject: [time-nuts]  5370B yet again
> To: Discussion of precise time and frequency measurement
> <time-nuts at febo.com>
> Message-ID: <4A13EDA3.4000908 at mail.ua.pt>
> 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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> End of time-nuts Digest, Vol 58, Issue 46
> *****************************************
> 