[ARC5] RE: [MRCA] BC-348 Dynamotor Temp.

[WA5CAB at cs.com]

Neil,

Your correction is correct but your methodology is incorrect, or at least 
undesirable from the originally stated parameters.  The ambient was given as 100 
F.  Therefore the temperature measuring equipment is to be presumed to be 
calibrated in deg. F.  You should convert the rated 40 C rise to deg F (72.0) and 
then add that to the ambient (172.0 F).  Had the thermometer in use been 
calibrated in deg C (and the rise in deg F) the safe approach would have been the 
reverse.  Reduces the chance of an experimental error.  You had to make two 
conversions versus only one for the other way 'round.  Double chance of error.  
Always work in the units that your instruments actually read.  They are 
probably the units the user is comfortable with.  Conversions are always suspect, 
especially with temperature, as people tend to forget that it is about the only 
commom parameter where zero in one system is not zero in the other.  Or they 
remember it when they shouldn't.

In a message dated 4/17/2008 11:08:48 PM Central Daylight Time, 
neilb at ihug.co.nz writes: 
> The correct process is to convert your ambient 100 F to C, add the 40 C 
> rise,
> then convert back to F.
> 

Robert Downs - Houston
<http://www.wa5cab.com> (Web Store)
MVPA 9480
<wa5cab at cs.com> (Primary email)
<wa5cab at comcast.net> (Backup email)