[Amps] FW: Transformer power rating guess(timate) and "stand-off" IR responding thermometers

[Robert Groh]

I bought one on Ebay for under $30 or so - a gun type device with an LED for 
aiming.  Take a look on eBay for item #110937511368.

Seems to work well (I used it for monitoring temperatures of devices in and 
around a 200W, 13VDC power supply).  Accuracy? Got no idea.  Repeatability - 
seemed to be reasonable.  Actual measured temperature will, of course, be a 
function of the thermal emissivity of the article being measured. I will not, I 
understand, measure the temperature of glass tubes very well. Response time is a 
couple of seconds. 


Cheapest way I could find to get some idea of what was going on.

73
Bob Groh, WA2CKY





________________________________
From: Gene May <gene-may at hotmail.com>
To: Amplifier Mailing List <amps at contesting.com>
Sent: Mon, August 27, 2012 5:49:46 PM
Subject: [Amps] FW: Transformer power rating guess(timate) and "stand-off" IR 
responding thermometers


In a recent exchange between K2VCO and KM1H, they describe what sounds like to 
me a good way to test out an unknown transformer's power rating.  I have seen 
hand-held stand-off, IR responding thermometers for sale at what seem like 
reasonable prices.  One aims the sensor at the Device Under Test and reads a 
temperature, supposedly.  These sensors would seem to be excellent to monitor 
such tests, and any other test where one is concerned about whether something is 
either being over-driven or under-cooled.

I'm interested in seeing whether the cooling I am building into an amplifier is 
sufficient for the tubes and the chokes and transformers in the power supply 
circuits.  Do any of the readers of this have any experience with any of these?  
Accuracy and repeatability?  Manufacturer name?  


Thanks for your help and advice.

Gene May
WB8WKU

                          
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