MJLorton Solar Power and Electronic Measurement Equipment Forum

General Category => General Discussion => Topic started by: TechJunkie on October 21, 2013, 12:13:55 PM

Title: Scored some Power Resistors for my Load Testing
Post by: TechJunkie on October 21, 2013, 12:13:55 PM

I scored a couple power resistors over the weekend for some passive load testing. I found a Dale 3 Ohm 5% 95W and a Ceramic 5 Ohm 135W which does not have a tolerance rating that I can see, but, it appears to be within 5% according to my Fluke 289.

Title: Re: Scored some Power Resistors for my Load Testing
Post by: SeanB on October 21, 2013, 01:41:47 PM

Very nice. Just remember that those resistors do need to be mounted vertically in free air with nothing flammable within 5cm ( 2 in) of them if you want to get near max dissipation, as they typically are rated to handle full power at a surface temperature of 150C or so, and at that dissipation the ceramic coating can no longer be regarded as an insulator, as it will be hot enough to be a very high resistance ( 1M or so) resistor.

Title: Re: Scored some Power Resistors for my Load Testing
Post by: TechJunkie on October 21, 2013, 01:47:16 PM

Thanks for the tip!