Electronics > Metrology

Creating some high-precision resistors, for calibration purposes

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--- Quote from: mendip_discovery on November 10, 2022, 06:44:26 pm ---. . .

So RandallMcRee I say to you. Have a go. See what you get. You might find that you do a fairly good job the first time around, if not you will learn and try something better. As long as you are honest to yourself on how good it is then you can work on that.

. . .

--- End quote ---

I had a go! I did use a rotary switch, since perfection is the enemy of the good (or something). Here are some photos of the assembly, along with measured values using my existing (non-calibrated) equipment. The spreadsheet shows the resistor type, some are good, some not so good.

It would be great if someone with calibrated 7.5/8.5 meter could also check it, preferably on the west coast, USA. Send me a PM.


P.S. I recently purchased a Fluke 5450A, as well. That also needs calibration, however. So I will work on that after applying Dr. Franks 5450A medicine, that is, the relay replacement.

Assembly photos

When it comes to resistance standards, they are generally approximations of their nominal value. You'll generally see standard resistors some way off of nominal.

Resistance calibrators usually store the measured value of the reistor in non-volatile memory - as your 5450A does. I'd also avoid messing with your 5450A unless you identify a problem.


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