I don't know this product, but from my past experience if it has a split primary transformer for switching between 115 and 230 VAC, check to see if fan is 115VAC. If it is and you run unit on 230VAC, the fan can cause increased residual noise due to the imbalance. Better to use a 230 VAC fan if running on that supply.
Just a thought.. Rob K -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Roy Phillips Sent: 20 May 2009 10:16 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 5070B once more.... Hello Pierre-François 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 ----- Original Message ----- From: "Pierre-François (f5bqp_pfm)" <[email protected]> To: <[email protected]> Sent: Wednesday, May 20, 2009 9:54 AM Subject: [time-nuts] 5070B once more.... > Hi The Gang, > > I've revitalized my 5070B I got few years ago and since a week or two it > has seen again passing into it few electrons after so long... lol... > 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'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? > I want to avoid to reivent the wheel by writing another piece of software. > > The 5070 (A or B) is really a great piece of hardware, I love it, exept > its noisy fan... > > Very good idea to invite Dave Chu to join the group, I'm sure his heart > will vibrate to see that his baby is still alive for a very long time... > ;-)) > > Best 73's to all of you. > pf, F5BQP > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
