resistances

Moshe Gerstenhaber and Mark Champion write: Numerous applications require the measurement of very low resistances, including but not limited to fuse integrity analysis, relay characterization, and superconductor evaluation.  There is a wide range of commercially available equipment designed for this task, but these units are prohibitively expensive and cannot be practically integrated into many applications outside the laboratory.  A common low-cost and compact method of measuring resistance is to inject a known dc current into the unknown resistor, measure the resulting voltage and calculate the resistance using Ohm’s law.  Unfortunately, for very low resistances, the current required to generate a voltage sufficiently distinguishable from the surrounding noise becomes impractically large. Complete, low-cost, software programmable ohmmeter measures micro-ohms – [ Link ] Low Ohm Meter – Measures 0.001 up to 1.999 Ohm Accurate Milliohm Measurement AC Ohmmeter – ESR Meter Ohm’s Calculator Test the safety of your devices with the VA588 multimeter