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
<[email protected]> 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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