Hacked Gadgets Forum

August 16, 2011

Milliohm Measurement Project

at 11:06 pm. Filed under DIY Hacks, Electronic Hacks

milliohm-measurement-project


Kerry Wong shows us a project that allows for accurate Milliohm Measurement. For day to day applications your trusty hand held multimeter will probably do just fine, but when you need to make a very accurate low resistance reading this circuit is sure to help you out.

“I used the reference design for the unity-gain difference amplifier AD8276 and a precision Op-Amp AD8603 from Analog Devices to form the precision constant current source. An AS431 precision shunt voltage reference is used for the 2.5V reference voltage. Using this design, the constant load current is Vref/R2. R2 (250 Ohm) will need to have relatively high precision in order for the load current to be accurate. If you are using other precision voltage references, the value of R2 will need to be adjusted so that Vref/R2=10 mA.”


 

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2 Responses to “Milliohm Measurement Project”

  1. David Says:

    I worked at an electrical hole sale industrial store. We had a meter that could tell you how long a pice of coiled up wire was by its resistance. Could do 22g to large MCM copper or alum wire. Could this project be used in a similar function?

  2. kdw Says:

    If you know the electrical resistivity of the material and the diameter of the wire, it can be calculated easily. Take a look at http://en.wikipedia.org/wiki/Resistivity.

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