Gents,
I'm surprised others have seen this happen and under differing
circumstances as well. An off list question asked me about the AC
voltage drop at the Astron when this was happening & I found the
following:
With the Astron turned on the voltage rests at 118.5 when the Keurig
is on & when the Astron hums the voltage drops to 115.6 & then
returns to 118.5 as soon as the hum stops. The hum lasts about 3
seconds each time and is not constant. I'm not thinking the 3V drop
as being significant to insufficient wiring, I have hooked other
coffeemakers to the same circuit in the past (Including a Delonge
pump expresso maker) but never heard anything like this with them
operation.
I have two Mackie HR824 studio monitors on my bench and since getting
the Keurig assumed this was some RFI getting into the monitors and
was more interested in the Keurig as bringing new RFI into the house.
It was only when I turned the monitors off and the sound happened
when I turned on the Keurig (K65 CLB/A) and the sound reappeared. I
then touched the speaker and it was not moving an explored to then
find it was the Astron that was vibrating.
Jim mentioned the grounding lug not being properly grounded on other
AStrons and I'll have to open the PS & see what gives with this one
> We have a Keurig single cup coffee maker (MODEL B145) at work and it's a
> very high current device (1500 watt rating which would be 12.5 amps). On a
> 15 amp outlet circuit that typically uses 14 gauge wiring the voltage drop
> would be approximately 6.4 volts for a 100 foot run back to the panel box
> and if you consider terminal resistances the drop would be even more to put
> things in perspective. On a 20 amp outlet circuit that typically uses 12
> gauge wiring the voltage drop would be approximately 4.0 volts if the run
> back to the panel box is 100 feet (again not taking into account terminal
> resistances).
>
> My home has a 3 car garage and the panel box is located on the outside wall
> of the garage, so runs of 100 feet or more back to the panel box are common
> in my home.
>
> Don (wd8dsb)
>
>
> On Thu, Apr 10, 2014 at 8:53 AM, D C _Mac_ Macdonald <k2gkk@hotmail.com>wrote:
>
> > Folks, if you are experiencing this sort of voltage drop, I believe that
> > you have a problem in your house wiring! You may have bad duplex outlets
> > or there may be high resistance connections ANYWHERE in the wiring causing
> > it.
> >
> > I think it is likely that you have bad connections (high resistance)
> > somewhere that are causing the voltage drop when high current devices are
> > turned on. They could even cause your house to catch fire and burn down!
> >
> > Get help immediately!
> >
> > * * * * * * * * * * *
> > * 73 - Mac, K2GKK/5 *
> > * (Since 30 Nov 53) *
> > * Oklahoma City, OK *
> > * USAF, Ret (61-81) *
> > * * * * * * * * * * *
> >
> >
> >
> >
> > > From: kd7jyk@earthlink.net
> > > To: rfi@contesting.com
> > > Date: Wed, 9 Apr 2014 20:31:32 -0700
> > > Subject: Re: [RFI] Keurig coffee vs Astron Rs35M
> > >
> > > : Every time I turn on my Keurig K-Cup coffee maker I've been hearing a
> > > : very loud sound like a low loud hum coming from my Astron RS35M power
> > > : supply.
> > >
> > > Mine did that when I ran an electric coffee pot upstairs. A line monitor
> > > indicated about a 6 volt drop in the AC circuit and the RS-35 would hum.
> > > Pot heater turned off, voltage went up, humming stopped.
> > >
> > > I have a Vornado fan in the hall that does the same thing.
> > >
> > > Kurt
> >
> > _______________________________________________
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> > RFI@contesting.com
> > http://lists.contesting.com/mailman/listinfo/rfi
> >
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