Hi John, A possible solution would be to use an infrared non-contact thermometer.
They measure temperature essentially by pointing them at the object of interest. They have a few drawbacks that I know of: 1. You need to have visual access to the part or surface of interest. 2. You need to account for "spot size" since its detector essentially integrates all of the infrared in its field of view. The spot size changes with distance from the thermometer to the surface of interest. 3. If you are trying to graph temperature over time: you can't just glue it in place and hook it to a data logger. I don't know if it would be worth rigging up some kind of tripod to keep the infrared detector aimed at the point of interest. We had one in the lab for a couple of days. It was a handheld, battery powered unit about the size of a Palm Pilot. Sadly, I only got to play with it a little bit before it was taken away. I wanted to see how accurate it was at measureing component temperatures on a circuitboard. Chris Maxwell | Design Engineer - Optical Division email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | > -----Original Message----- > From: Crabb, John [SMTP:jo...@exchange.scotland.ncr.com] > Sent: Monday, January 07, 2002 9:02 AM > To: emc-p...@majordomo.ieee.org > Subject: RE: EMC-related safety issues > > Seeing that we have got round to the subject of thermocouples, etc, I > often > use a Solartron SI3535D datalogger with thermocouples for measuring > component temperatures, and find quite often that it does not give > "correct" > readings when thermocouples are placed on transformers in switching > power supplies, high voltage transformers in monitors, etc. I can get > a > "correct" reading by switching off the EUT momentarily, obviously > removing the source of the problem. Note that the problem can occur > even if the thermocouple is not making an electrical connection to the > component winding involved. > > Any suggestions how to overcome this ? My previous antique datalogger > didn't have this problem, but it eventually had to be scrapped due to > lack > of spare parts - and the expectation that a more modern unit would be > better !. > > Regards, > John Crabb, Development Excellence (Product Safety) , > NCR Financial Solutions Group Ltd., Kingsway West, Dundee, Scotland. > DD2 3XX > E-Mail :john.cr...@scotland.ncr.com > Tel: +44 (0)1382-592289 (direct ). Fax +44 (0)1382-622243. > VoicePlus 6-341-2289. ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
