# Questions tagged [inductance-measurement]

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

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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. ...
53 views

### Problem with inductance meter

I'm trying to simulate a design I found for an inductance meter based on an LC tank and Arduino. To simulate this circuit, I put an amplitude for the current pulse of 40 mA, approximately the current ...
58 views

### How can I make a 50mH inductor/coil that can stand up to 3A current to be used as a DC inductive load?

It will be used to simulate an inductive load for a DC output.
70 views

### Measuring extremely small inductance (pH) with transient pulse response

I've made an inductor device. It has 2 terminals. It has inductance, resistance, and some parallel interwinding capacitance. I am using a Keysight B1500a semiconductor probe station, which has ...
• 73
1 vote
88 views

### 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 ...
33 views

### How can i measure a transformer primary inductance with a load on the secondary?

I have an x-ray closed transformer and I only can access to the primary terminals. I want to measure the inductance of the primary and to know how this loaded secondary influences it.
48 views

### How to account for differences in measured DC resistance of motor winding

I have five small brushless DC motors from KDE, model# KDE2315XF-2050. The specs for this motor state that the winding resistance is 0.034 Ohms, and having conversed with KDE, they state the winding ...
• 55
163 views

### VK3BHR LC meter inductance measurement problem

I am making the LC meter V2 designed by VK3BHR Phil Rice. https://sites.google.com/site/vk3bhr/home/index2-html I have seen many have done this and it works fine, but in my case it is not measuring ...
875 views

### 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 ...
• 2,021
4k views

### 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 ...
• 774
242 views

### Measurement of Resistor Parasitics Inductance and Capacitance

I have seen people doing some measurements of parasitic capacitance and inductance of some resistors, by using a vector analyzer and analyzing the graph of S11 with respect to frequency. To get this ...
• 3,246
1 vote
605 views

### 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.
• 31
9k views

### 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 ...
• 293
1 vote
909 views

### 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 ...
• 409
1 vote
5k views

### 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, ...
• 389
1 vote
498 views

### 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 ...
• 93
312 views

### Air-core transformer measurement using LCR meter

Is it possible to measure the magnetizing and leakage inductances of an air-core transformer (coupled coils with no ferrite core) normally using LCR meter? I want to get the values of magnetizing ...
• 329
910 views

### 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 ...
3k views

### 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 ...
• 133
914 views

### 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 ...
2k views

### How do multimeters measure inductance?

I know that some multimeters measure capacitance by applying a constant current in a time Delta t, measuring the voltage difference before and after the current was applied, and solving I = C * (...
229 views

### Can I measure resistance of an inductor on a bridge?

I designed a circuit to have a Q-factor of 15, knowing the inductor value I rearranged the equation $\omega_o=\frac{1}{\sqrt{LC}}$ to give me a capacitor value for a certain resonant frequency. When ...
• 79
3k views

### 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 ...
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