[Elecraft] Temperature or Warmth of KPA500 when "Off" ?

[Phil Hystad]

Yes, there is a master switch.  I think I forgot about that.  

> On Jun 30, 2021, at 8:47 AM, Ken Winterling <wa2lbi at gmail.com> wrote:
> 
> Phil,
> 
> No need to unplug the KPA500 when not in use. There is a master power
> switch on the rear panel that will disconnect everything.
> 
> Ken
> WA2LBI
> 
> 
> 
> 
> 
> On Wed, Jun 30, 2021 at 11:41 AM Louandzip via Elecraft <
> elecraft at mailman.qth.net> wrote:
> 
>> I use a clamp on ammeter and a short power cord jumper with the wires
>> separated where I can clamp over the black wire.  That quantitatively tells
>> me the power being consumed/dissipated. Keep in mind temperature is
>> intensive whereas heat is extensive.
>> 
>> Lou W7HV
>> 
>>    On Wednesday, June 30, 2021, 9:32:28 AM MDT, Phil Hystad via Elecraft <
>> elecraft at mailman.qth.net> wrote:
>> 
>> Living in the Pacific Northwest and having just gone through a big bath
>> of heat I have become a temperature detective.  Anything not being used
>> should not be radiating in the infrared spectrum above surroundings.  Thus,
>> all of my radios are off.
>> 
>> Or, so I thought.  I forgot that the KPA500 was still on though off and I
>> put my hand on the side of the cabinet and discovered some dastardly warmth
>> — a “no-no” in this non-air-conditioned house.  So, I unplugged the KPA500
>> for the time being.
>> 
>> But, I was surprised.  I would have guessed that I would not be able to
>> sense any warmth from the cabinet as the surrounding environment should
>> have kept it cooler.  It was not hot.  Just warm to the touch.  Definitely
>> not as warm as my iMac computer that I am using at the moment.
>> 
>> I should get my infrared temperature sensor and measure the actual
>> radiated temperature and maybe I will do that some day.
>> 
>> But, is this normal?  I assume that there is a small current powering a
>> micro processor and its related circuitry but should it be actually that
>> warm — is there a cpu burning "idle loop" used and thus causing high
>> current flow thru the processor.
>> 
>> If it were not for the fact that breakfast is almost ready (steel cut
>> oatmeal) I would plug the KPA500 back in and wait a while and then measure
>> the temperature of the cabinet.  I will do that later.
>> 
>> 73, phil, K7PEH
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