Related Experiment Video
Updated: Jun 9, 2025
11:30
Recombination Dynamics in Thin-film Photovoltaic Materials via Time-resolved Microwave Conductivity
Published on: March 6, 2017
11.6K
Low-Ohmic Resistance Comparison: Measurement Capabilities and Resistor Traveling Behavior
Gert Rietveld1, Jan H N van der Beek1, Marlin Kraft2
1Van Swinden Laboratorium, the National Metrology Institute of The Netherlands, 2600 AR Delft, The Netherlands.
IEEE Transactions on Instrumentation and Measurement
|October 24, 2024
Summary
Low-ohmic resistance measurements at three national metrology institutes showed excellent agreement. Careful resistor transport was key, though some resistance elements exhibited value shifts during handling.
Area of Science:
- Metrology
- Electrical Engineering
- Materials Science
Background:
- Accurate low-ohmic resistance measurements are critical for various scientific and industrial applications.
- Interlaboratory comparisons are essential for validating measurement capabilities and ensuring traceability.
Purpose of the Study:
- To compare the low-ohmic resistance measurement capabilities of three national metrology institutes.
- To assess the agreement of measurements for resistors in the range of 100 mΩ to 100 μΩ.
Main Methods:
- A set of low-ohmic resistors (100 mΩ, 10 mΩ, 1 mΩ, 100 μΩ) were circulated among three laboratories: Van Swinden Laboratorium, National Institute of Standards and Technology, and METAS.
- Measurement results were compared against a comparison reference value, considering respective measurement uncertainties.
Main Results:
- Measurement results from the three laboratories demonstrated excellent agreement within their stated uncertainties.
- Some resistors exhibited discrete changes in resistance value after each transport, suggesting a link to their construction.
Conclusions:
- The intercomparison confirms the high accuracy of low-ohmic resistance measurements at the participating national metrology institutes.
- The observed resistance shifts highlight the importance of resistor construction and handling in precise low-ohmic measurements.
Keywords:
Comparisonlow-ohmic measurementsprecision measurementsresistance measurementsresistorsshuntstraveling behaviorMore Related Videos
Related Concept Videos
01:19Ohm's Law
701
Resistors are fundamental components in electrical circuits, often manufactured from metallic alloys or carbon compounds. They model a material's ability to resist the flow of electric current, a characteristic that is crucial in controlling and regulating electrical power within a circuit.
This current-resisting behavior of resistors is governed by Ohm's law, which states that the voltage across a resistor is directly proportional to the current flowing through it.
This current-resisting behavior of resistors is governed by Ohm's law, which states that the voltage across a resistor is directly proportional to the current flowing through it.
701
01:19Resistance
4.3K
When a current moves through any conductor, the conductor causes some level of difficulty for the current to flow. The measure of that difficulty is known as the resistance of the material and is represented by R. Every material has its own resistance. In the case of conductors, heat is emitted whenever a current passes through them. Resistance depends on the resistivity of the material. Resistivity is a characteristic of the material used to fabricate electrical components, whereas the...
4.3K
01:25Resistance and Conductance
73
A conductor's DC resistance at a given temperature is influenced by its resistivity, length, and cross-sectional area. Resistivity is an inherent property of the conductor material, with annealed copper serving as the international standard for measurement. For instance, the resistivity of hard-drawn aluminum at 20 degrees Celsius is 61% of the standard conductivity of annealed copper.
Various factors impact the resistance of a conductor. Spiraling in stranded conductors increases their...
Various factors impact the resistance of a conductor. Spiraling in stranded conductors increases their...
73
01:22Resistivity
3.4K
When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
3.4K
01:29Wheatstone Bridge
450
An ohmmeter is a resistance-measuring device. It works by applying a voltage to a resistor of unknown resistance and measuring the current across the resistor. The resistance value is deduced using Ohm's law. Usually, the standard configuration of an ohmmeter comprises a voltmeter or an ammeter. However, such configurations are limited in accuracy because the meters alter the voltage applied to the resistor and the current that flows through it.
Thus, for accurate resistance measurements, a...
Thus, for accurate resistance measurements, a...
450
01:30Potentiometer
569
Voltage and current measurements using a standard voltmeter and ammeter alter the circuit being measured either by drawing or resisting the current flow, which introduces uncertainties in the measurements. Null measurements balance the voltages so that no current flows through the measuring device and, therefore, no alterations occur in the measured circuit.
Suppose the emf of a battery needs to be measured. If the battery is directly connected to a standard voltmeter, the measured quantity is...
Suppose the emf of a battery needs to be measured. If the battery is directly connected to a standard voltmeter, the measured quantity is...
569