I would not have thought that a variation of 10-15 degrees was unusual. If you apply your thermocouples to the outside of a coil or transformer winding, it is likely that there will be localised hot spots, depending on how close you are to the core; how many layers of insulation there may be in the region of your thermocouple; air gaps between the windings and the insulation; and the consistency of the "thermal resistance" between your thermocouple and the point of application.
I have also noted wild discrepancies when measuring temperatures of EHT transformers in VDUs, (obviously due to EMC affecting my data-logger !!), which I could only resolve by momentarily switching off the VDU and making my measurement quickly. 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. > -----Original Message----- > From: Kamran Mohajer [SMTP:kmoha...@cisco.com] > Sent: 24 August 1999 22:50 > To: emc-p...@ieee.org > Subject: Temperature Measuring of Magnetic Components > > > Hello EMC-PSTCers, > > I wonder if anyone knows of the method of measuring temperature limits on > magnetic components. I happen to get involved in this and found that my > results are different than the vendors result by as much as 10-15 degrees > on measuring on a same magnetic component. Even applying the thermocouple > to different location on a coil seems to give you different results. Is > there a method that I should be following to measure temperature with > thermocouples methods, not change of resistance, on magnetic parts such as > transformers, coils, etc.? > > Thanks, > > > ************************************************************************** > ********* > Kamran Mohajer > DSL Compliance Lead > Cisco Systems, Inc. > Phone(408)-525-6121 > Fax(408)527-0495 > kmoha...@cisco.com > ************************************************************************** > ********* > > --------- > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to majord...@ieee.org > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to ed.pr...@cubic.com, > jim_bac...@monarch.com, ri...@sdd.hp.com, or > roger.volgst...@compaq.com (the list administrators). > --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
