winding a non inductive resistor
It is easy too build a non inductive resistor if you are able to calculate the length of a wire from its resistivity and measure its resistance. Once you have the length, cut the wire and find its middle point, bend it to make two parts of equal length and start winding the wire from its center. You can choose any spool, preferably of plastic. In this way you will wind two windings that cancel their magnetic fields each other. If you use copper wire, now you have the trouble of a temperature dependent non inductive resistor. If you use it into an environment where not exist big temperature changes, such dependance is not very bad, but if you are a purist metrologist then you need to use manganine wire.
It is easy too build a non inductive resistor if you are able to calculate the length of a wire from its resistivity and measure its resistance. Once you have the length, cut the wire and find its middle point, bend it to make two parts of equal length and start winding the wire from its center. You can choose any spool, preferably of plastic. In this way you will wind two windings that cancel their magnetic fields each other. If you use copper wire, now you have the trouble of a temperature dependent non inductive resistor. If you use it into an environment where not exist big temperature changes, such dependance is not very bad, but if you are a purist metrologist then you need to use manganine wire.
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