Electrical Engineering Stack Exchange
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Questions tagged [inductance-measurement]

For questions about measuring inductance. Also use the "measurement" tag unless doing so would result in too many tags.

For questions about measuring inductance. Also use unless doing so would result in too many tags.

30 questions
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Methods to measure inductance with high (1%) precision using standard equipment?

I am modeling the fine behavior of interacting oscillatory circuits. I have looked up a couple of methods for measuring inductance. I believe I am following the procedure faithfully, but the values I obtain aren't as precise as I expect. This is, in…
KBL
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10
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What is Negative Inductance?

I am experimenting with a stripline square spiral inductor in Sonnet and the graph is showing both a positive and negative inductance. What does it mean to have a negative inductance? Why does it swing above and below 0? What does it mean about the…
KJ7LNW
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2 answers

How much might inductance change if the core is water instead of air?

I'm trying to make a water level indicator. I don’t like giant float switches. If anyhow change of inductance can be measured due to change of water level, it would be helpful. I'll buy copper coil tomorrow.
Sadat Rafi
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2 answers

How do I measure the Inductance

How do I measure the inductance of this air round coil attached to the antenna of a tube radio? I have read something about LC tank circuit here but im not sure how I would apply it. Would I use the resistor already attached to the coil and probe it…
Chris Manning
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1 answer

Determining inductance using a multimeter

I'm having a hard time understanding why one couldn't measure the inductance of a coil using a simple multimeter capable of measuring AC voltages and currents: simulate this circuit – Schematic created using CircuitLab The total series impedance…
ccrisan
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1 answer

Measuring Quality Factor of an Ideal Inductor

For my lab work, I have to design a method to measure the quality factor of an ideal inductor between 1MHz to 5MHz, away from resonance frequency. We know that an ideal inductor has the form (with a series resistor): simulate this circuit –…
Cagan Selim Coban
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1 answer

What types of inductor cores exhibit magnetization?

My understanding of magnetization in core memories is as follows: a bit is written to an inductor's core by magnetizing it, by applying a large current. Later, the bit is read by observing the effect of this magnetization on the saturation point. Is…
personal_cloud
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4 channel inductance meter with LM339

I'm working on project where I would like to measure inductance of 4 different springs (to measure weights) using uC - Arduino. I found out that you can do that by measuring frequency of LC circuit and then converting signal to digital using LM339…
Delphi4U
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Sense small variations in inductance in AC for a metal detector circuit

I am currently working on the design of a metal detector circuit. I am relying on the method that the coil's inductance would change when a metal is close to it (due to eddy currents.) I have tried several methods using op-amps such as…
Mora
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Measuring time-varying inductances

I am using a circuit based on an LC tank and Arduino that is used to measure inductances. The amplitude for the current pulse is of 40 mA, approximately the current that an Arduino pin gives at 5V. The values ​​for the pulse rise and fall times are…
Sharik_97
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Formula for inductance with a rectangular non-air core coil?

Does anyone have a formula for calculating the inductance for a coil wrapped around a rectangular non-air core? Seems trivial but this is the closest I've come in searching, and this is for air-core only:…
Bryan Hall
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Inductance value for ceiling/pedestal 230/240Vac single phase ac fans

I need to know how to roughly get idea about indcutance value of ceiling pedestal single phase AC fan? I want to roughly model this.
Muhammad
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Measuring Inductance

I have been looking the number of methods to measure inductance of a coil if you don't have an LCR meter available, and I have had some difficulty. I designed and built a coil and I would like to confirm its inductance, which theoretically is…
Dave
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How to check ferrite beads?

I faced with a problem of checking ferrite bead with parameters: The measurements for two reels of this component have difference in Resistance and inductance: Reel 1: Resistance: 170 mOhm, Inductance: 2.5 uH (10kHz) Reel 2: Resistance: 460 mOhm,…
KMM
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5 answers

Detect if coil is near steel piece using MCU

How to detect inductance change using MCU (lowest power methods preferred). I want to detect if the coil touches steel piece (higher inductance) and when it does not (lower inductance). Basically I need to compare inductances at two positions and…
PSz
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