Low Resistance Measurement Circuit

The low resistance measurement will indicate to the observant operator when. Connect a dc power supply to the circuit and adjust the power supply so that it supplies a constant current to the circuit as shown in the diagram above within the circuit s capabilities of course. There are special low resistance meters so called milliohm meter there are some which offer a resolution of 0 01µ ω which would be way overkill here.

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In the above picture r is the unknown resistor and v is a multimeter set to read millivolts.

Low resistance measurement circuit.

Low ohm meter measures 0 001 up to 1 999 ohm a very simple circuit to measure low resistance values from 0 001 up to 1 999 ohm. You must use two separate batteries. C1 optional 0 1 microfarad ceramic capacitor to smooth the power supply. They use different constant currents based on the resistance range.

The practical unit is the ohm. 5 vdc and gnd hooked up to the top and bottom of the breadboard. Thus to eliminate this issue small valued resistance are constructed with four terminals. R1 220 ohm known resistance.

C2 optional 10 microfarad tantalum capacitor to smooth the power supply. Low resistance measurement circuit on a solderless breadboard. Resistance r is the property of a circuit or element that determines for a given current the rate at which electrical energy is converted to heat in accordance with the formula w i2r. The major problem in measurement of low resistance values is the contact resistance or lead resistance of the measuring instruments though being small in value is comparable to the resistance being measured and hence causes serious error.

With a direct resistance readout in ohms. 0 0 1 an ohmmeter measures the total resistance in the circuit including the resistance introduced by the test leads attached to the meter in addition to the resistance of any other wires in the circuit. Even with a much lower 1mω source resistance a 1µv measurement is near theoretical limits so it would be very difficult to make using an ordinary dmm. Low resistance measurement method basically the trick is to pass a stable known amount of current through the low value resistor and measure the voltage drop across it.

What does the low resistance measurement tell the operator. They internally work on the same principle. Obviously the multimeter is connected permanently as shown in picture. Top hooked to 5 v and bottom hooked to r2.

In addition to having insufficient voltage or current sensitivity most dmms are no more sensitive than 1µv or 1na per digit dmms have high low level dc measuring instruments 1 3. The kelvin measurement can be a practical tool for finding poor connections or unexpected resistance in an electrical circuit.

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