# Questions tagged [lcr]

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25 views

### Immo coil - Resistance, Reactance and Impedance - Differences needed

Since I work in an automobile lock manufacturing company, I was measuring the DC resistance of an Immo coil using a multimeter (used in automobiles for security purposes) and found out the value was ...
41 views

### Measure Delta wound BLDC motor inductance and resistance

I'm using a VESC motor ESC to drive several different motors. When I connect a new motor, it has the ability to detect the motor parameters, but somehow gets it wrong for some of the larger motors: ...
74 views

### What's the best way to measure air-core transformer and variable capacitor using an LCR

In order to create a model I need to measure the capacitance of a variable capacitor and an air-core transformer. This is my first time dealing with old models of capacitors and inductors and I'm ...
1 vote
29 views

### Online motor inductance measurement at different rotor angle

I wanted to measure the inductance of PMSM at different rotor angles. I'm familiar with the offline methods of measuring motor inductance but would like to measure a motor's inductance while it's ...
512 views

### How to calculate the natural frequency of a series LC circuit?

The below question is just to exemplify what I mean, I don't need help with this question, but rather the concepts behind it From the wwikipedia article on natural frequency I concluded that for an LC ...
129 views

### How to read this accuracy chart?

I've never seen a chart like this before. I'm just trying to figure out what the accuracy of this LCR meter (BK891) is between the 10-100 µF region. Why does it look like it's putting capacitance vs ...
79 views

### Resonance in a series parallel combination circuit

This lc circuit has capacitors in parallel and series with the inductor. What happens at resonance? Will it be parallel resonance, series resonance or can you have multiple resonances? Is the total ...
1 vote
81 views

### Why is the current flowing 1 s after being disconnected $\frac{1}{e}\ \mathrm{A}$ instead of $1-\frac{1}{e}\ \mathrm{A}$?

If in the given circuit (L = 100 mH, R = 100 Ω, and E = 100 V), after being in steady state for a long time, A and B are connected, find the current flowing in the circuit after a millisecond. To do ...
107 views

### How to find an equivalent LC circuit from a combination LC circuit [closed]

I have a circuit containing a number of L and C, both in parallel and series. How can I find the equivalent LC circuit (with a single L and C) for such a circuit? Kirchhoff or Thevenin can give me the ...
172 views

Here I have a series LCR circuit with resonant frequency greater than 200Hz. Is there a way to know whether this circuit is an inductive or a capacitive load? Edit: The only additional information we ...
7k views

### What does negative capacitance mean?

I see negative capacitance measuring electrolytic capacitor at high frequencies (40kHz). How should I interpret that? The device is LCR Meter Hantek 1832C. I failed to find anything about that in the ...
102 views

### Finding ESR of LCR circuit?

I have an LCR circuit, and I am trying to find the ESR of a capacitor. I bought a 820uH inductor , and an ultra-low 1000pF capacitor, and a 46.6ohm 1% tolerance resistor. Below is my circuit with ...
148 views

844 views

### Determining the resonant angular frequency

I am facing trouble with finding out the resonant angular frequency of the above circuit.I know that at resonance impedence of the circuit is minimum.I am new to this topic and I tried to find out the ...
1 vote