I would like to perform an experiment to measure the conductivity of a copper rod. What device can I use to perform that experiment? Is there such a thing as a conductivity meter? All I found was an apparatus to measure the conductivity of solutions. Please note that I need to get results as accurate as possible.
Electronic – How to measure the conductivity of a copper rod
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Related Solutions
Finding a fuse with those characteristics is going to be difficult. I'd use a current shunt with a suitable MCU and circuit breaker and monitor the current taken by the device, shutting off the current if it rises above 120A for 15 seconds.
Two fuses in parallel can cause problems unless they are well-matched and the holders are properly designed. Any difference between them can cause one fuse to take more current than the other one, and fail.
Source: application note AN687 by microchip. It shows one of the methods of signal conditioning for 3-wire RTD. Notice that this method doesn't require a Wheatstone bridge.
Best Answer
Apart from the well known 4-wire measurement method there is another interesting method of measuring conductivity, especially useful for larger samples: you could call it a "0-wire" measurement beause it works without even touching the material:
Eddy current testing:
A coil is used to create an alternating magnetic field, that induces alternating eddy currents in the material (proportional to its conductivity). Those currents in turn create another alternating magnetic field that affects the impedance of the coil.
See e.g. this link or this pdf.