[Elecraft] [KX3] A Comparative Performance Assessment (of Aftermarket KX3 Heatsinks)

[Don Wilhelm]

That is true, but that is still inadequate information for 
environmentally related measurements.
Exactly how was that measured?  What was the measurement device, when 
was it last calibrated, was the calibration traceable to a secondary 
NIST standard?  Was the point where the temperature was measured 
identified and consistent from test to test?  How were the initial 
conditions determined?  Within what degree of certainty? Was the air 
flow actually monitored during the test and from test run to test run - 
how was it measured and at what position(s) - why does still air have to 
be in quotes? Without that kind information, we have to make assumptions 
that may or may not be valid.

Making system level measurements on environmentally related tests 
requires that every piece of the environment be specified - down to the 
placement of the DUT in the environment.

My 10 years professional experience with engineering level measurements 
has lead me to question every piece of test equipment as well as how it 
is used as well as identification of the test setup.
That information is important to determine that degree of error in the 
overall measurements.
Environmental testing requires much more setup and environment data than 
making voltage checks because there are many factors that may alter the 
data.

73,
Don W3FPR

On 9/2/2014 1:55 PM, Gary W. Hvizdak wrote:
> P.S.  Don, Adrian's test report clearly states that he conducted all of his
> tests in "still air" and that the ambient temperature remained between a
> half degree of 25 degrees C.
>
>