Composite milliohm-meter for resistance measurement of precision current shunts in industrial environment

Urekar, Marjan; Novaković, Đorđe; Gazivoda, Nemanja

doi:10.2298/fuee1901075u

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…Reversing the polarity of the applied current makes it possible to eliminate thermal voltage measurement errors (Ali, 2018). However, to achieve a reasonable accuracy of measurement, a high-test current value is required which can result in undesired heating effect in the resistance being measured (Štambuk & Malarić, R. 2015;Urekar, Novaković & Gazivoda 2019). The use of large measurement current to get a good accuracy of measurement can be avoided if lock-in measurement technique is applied.…”

Section: Literature Reviewmentioning

confidence: 99%

Development of a Multi-Range Microcontroller Based Lock-In Digital Milliohm Meter

Petinrin¹,

Johnson²,

Ogunseye³

et al. 2022

FUOYEJET

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Milliohm Meter is an instrument for measuring very small amount of resistance in a conductor, electric motor and transformer windings and in many other current sensing applications that cannot be measured with standard digital ohmmeters. The cost of commercially available milliohm meter is relatively high, making it unaffordable for hobbyists. In this work, a low-cost microcontroller based digital milliohm meter having three measurement sub-ranges was designed, constructed, tested and calibrated. The instrument, based on the PIC16f877A 8-bit microcontroller, used the lock-in detection technique to improve the measurement signal-to-noise ratio without requiring high current for measurement. The milliohm meter’s firmware was written with MicroC software by Mikroelektronika® and was simulated using Proteus® software by Labcenter Electronics. After construction and calibration, it was found to have resolutions of 82.9320 counts/mΩ, 9.1394 counts/mΩ, and 0.9221 counts/mΩ for the measurement ranges of 0 – 10mΩ, 0- 100mΩ and 0 – 1000mΩ respectively. Thus, the instrument is capable of measuring resistance value between 0Ω to 1Ω with good resolution values without requiring the computing power and display capabilities of a digital computer.

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Section: Literature Reviewmentioning

confidence: 99%

Development of a Multi-Range Microcontroller Based Lock-In Digital Milliohm Meter

Petinrin¹,

Johnson²,

Ogunseye³

et al. 2022

FUOYEJET

View full text Add to dashboard Cite

show abstract

A rapid resistance measurement system for quartz pendulums

Wang

et al. 2020

Review of Scientific Instruments

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A quartz pendulum, gold plated on both sides, is the core component of a quartz accelerometer. Currently, a two-wire manual measurement method is employed to measure the resistance at 24 key positions on the gold plating to evaluate manufacturing quality. This method is time-consuming and has poor repeatability. In this paper, an automatic measurement system is proposed to measure these 24 resistances. The proposed system consists primarily of a lab-designed holder that clamps the sample, a machine vision unit to measure the sample position, RXY-stages for precise positioning, two lab-designed probes with 48 needles to sense the electrical signals, a multichannel self-switching module to sample the electrical signals from the probe needles, and a 7½-digital multimeter to measure the resistances. In addition, a simple, precise pre-measurement positioning method is introduced here. Experimental results show that the quartz-pendulum resistances can be measured quickly and precisely using the proposed system. The measurement rate of 1 pendulum/min is a factor of 10 faster than the current manual method, the measurement stability error is only 0.9 mΩ (a relative error of 0.13%), and the measurement repeatability error is 1.2 mΩ (a relative error of 0.20%).

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Composite milliohm-meter for resistance measurement of precision current shunts in industrial environment

Cited by 2 publications

References 3 publications

Development of a Multi-Range Microcontroller Based Lock-In Digital Milliohm Meter

Development of a Multi-Range Microcontroller Based Lock-In Digital Milliohm Meter

A rapid resistance measurement system for quartz pendulums

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