[time-nuts] HP 5061B

[paul swed]

Jeff
Since its the b I will guess it has the dc CS oven controller.
I speculate you may be hearing one of the inductors singing.
The CS controller can be taken out and the cover removed then reconnected
laying it sort of on the table so that you can more easily hear which one is
singing.
If thats true then thats the place to start to trouble shoot.
But the key really is whats singing. There are no alarms that I am aware of.
Regards
Paul



On Sat, Sep 3, 2011 at 10:46 AM, <EWKehren at aol.com> wrote:

>
> Jeff from your description it is not clear wether the noise is due to the
> UPS or 5061B. The 5061 transformer most likely will complain with a crappy
> signal input.I do not trust the output from UPS since many have a crappy
> output  which is ok if your PC does not have PFC on the input.
> I have in the past always used and recommended to run the units from 28
> Volt direct, not even using the AC input. Batteries do not have to be deep
> cycle  since power failures are not that prevalent and batteries will die
> from
> chemical  deterioration rather than cycle use. Low voltage cut out is
> mandetory since car  batteries will fail after a few full discharges.For
> instance
> Costco car  batteries have long warranties and combined with a Guest dual
> 12
> V 5/5 charger  makes a perfect set up for less than $230 and run time will
> be about 24 hours.  If you do not mind making small changes to the A2
> charger board you can get the  same result for half the price supplying
> power from
> the 5061B. I prefer the  Guest approach and I have noticed a price
> escalation on Guest chargers but you  can still get one for $110 shipping
> included.
> Bert Kehren
>
>
> In a message dated 9/3/2011 6:32:19 A.M. Eastern Daylight Time,
> w3kl at w3kl.com writes:
>
> Hi.
>
> We lost power for several days after the hurricane  last weekend.  As a
> precaution I pulled the AC plug for my 5061B from the  UPS it's attached to
> since I was pretty sure that we would be without power  for a while and
> didn't
> want to have the unit plugged in when the power came  back in case there
> was
> a surge.
>
> Power was restored on Tuesday but  I only got around to powering up the
> system  this  morning.
>
> When  I plugged it in, it immediately started  making a buzzing sound -
> alomost like an alarm.  The system appears to be  working normally
> otherwise -
> alarm LED on, clock advancing,  etc.
>
> I've never heard this buzzing  before during power  up.
>
> Not knowing what the issue was, I powered the system  down.
>
> Anyone have any clue before I start tearing it  down?
>
> BTW - I don't see any mention of this in the  manual.
>
> Thanks in  advance.
>
> Jeff
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