### Author Topic: Gaussian Resistors  (Read 19993 times)

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#### grenert

• Frequent Contributor
• Posts: 446
##### Re: Gaussian Resistors
« Reply #25 on: November 13, 2011, 05:53:57 pm »
Robrenz, those clips are the same ones that Agilent sells for $45 a pair! http://www.home.agilent.com/agilent/product.jspx?nid=-536902470.536880336.00&lc=eng&cc=US Would you mind explaining how reversing the current changes the thermal EMF? I thought the EMF is the result of dissimilar metals in contact, and would not be affected by the current direction. #### robrenz • Super Contributor • Posts: 3035 • Country: • Real Machinist, Wannabe EE ##### Re: Gaussian Resistors « Reply #26 on: November 14, 2011, 01:56:39 am » Robrenz, those clips are the same ones that Agilent sells for$45 a pair!
http://www.home.agilent.com/agilent/product.jspx?nid=-536902470.536880336.00&lc=eng&cc=US

Would you mind explaining how reversing the current changes the thermal EMF?  I thought the EMF is the result of dissimilar metals in contact, and would not be affected by the current direction.

It does not change the thermal emf.

read Section 3-19 on current reversal method.  The whole book is excellent.

http://www.keithley.com/knowledgecenter/knowledgecenter_pdf/LowLevMsHandbk_1.pdf

#### scopeman

• Regular Contributor
• Posts: 181
##### Re: Gaussian Resistors
« Reply #27 on: November 21, 2011, 02:51:36 am »
Hello Dave,

You probably know this but there is a statistics add in for Excel that will do all of the statistical analysis for you. Just look under Tools> Data Analysis > Descriptive Statistics.

It is a free add in that most Excel users never turn on.

I find it quite useful.

Sam

Smf