# Questions tagged [lcr]

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### How to choose the right frequency when measuring coil inductance with LCR meter

I would like to drive a 12V DC hydraulic valve coil using a high side driver (VN7140AJ). The driver datasheet specifies the maximum demagnetization energy (page 24), and I would like to make sure that ...
1answer
36 views

### Measuring capacitance of Metal-Insulator-Semiconductor (MIS) structure with LCR meter

I can not get my head around what a LCR meter measures. My LCR meter measures my device (MIS) which is displayed as C_p and G_p (other components can be neglected). My LCR meter displays C_p, G_p, the ...
1answer
37 views

### LCR meter weird datasheet

I have a LCR meter. In the datasheet there is a measurement frequency given for the inductance measurement. But not for the measurement of the capacitance. Is the frequency for the capacitance ...
2answers
141 views

### LC in parallel with R circuit resonance

I've been doing an experiment which involves measuring the voltage across the capacitor at different driving frequencies. Consider the circuit below: A sketch of the experimental curve \\$(R_1<R_2&...
3answers
73 views

### Measure in circuit SMD capacitor using LCR meter

I recently bought an LCR meter BK880. Is it possible to measure the capacitance of a SMD capacitor in a circuit without removing it?
0answers
163 views

### Unstable behavior of Dc-Dc converter

I am currently working on a high voltage boost converter based on Dos4Evers 555 timer based one https://www.dos4ever.com/flyback/flyback.html (12v to 140-220V). I am running into an issue with the ...
2answers
146 views

### Measure universal motor inductance with LCR meter

I'm trying to measure the inductance and equivalent series resistance of an universal motor (from a sewing machine, 120V, 0.8A) with a B&K 879B LCR meter. The measurements vary widely with the ...
2answers
94 views

### Will I blow up my LCR Meter?

I have a situation where I need to measure a capacitor connected to a live circuit like the image shows. I'm considering a LCR meter because we also have to measure both capacitance and resistance of ...
0answers
35 views

### How to read instrument's range graph

I have an Agilent 4980 LCR meter and in its manual it has several graphs indicating the effective measurement ranges for each scale, like the one below: How to read such a graph to be sure that the ...
1answer
51 views

### LCR meter defect - preventive actions

I got my hands on a BK880 LCR meter and now it's the second time that I destroyed the device. It can't hold the measurement voltage - So it always tries to measure with around 0V. What I am doing ...
2answers
236 views

### Agilent 4294A Impedance Analyzer: “Bridge Unbalanced” during calibration

I am having problems calibrating my test fixture for the Agilent 4294A Impedance Analyzer. The open measurement always works, but with the short measurement I always get the error message "Bridge ...
1answer
47 views

### Custom Test Fixture for LCR meter

I've designed and built a custom test fixture (based on Keysight's 16047A) to be able to measure multiple pin capacitors. When testing it to compare both fixtures (the custom and the original), I ...
0answers
100 views

### Resonant, autotuned nanopulser

My need is to build (or purchase, if existent) a nanopulser, but not an ordinary one: it has to have some specific characteristics. The premise is: I have a device which acts as a variable capacitor ...
2answers
963 views

### Why does an SMPS use LCR on INPUT?

I have this 5 V output SMPS I bought a while ago. I was wondering why there are LCRs connected to the input of my SMPS. I don't understand why it's there. BTW, I'm an electrical engineering student, ...
2answers
2k views

### Phase shift in an LCR circuit

In a capacitive circuit the voltage lags current by 90 degrees. In an inductive circuit voltage leads current by 90 degrees. In a resistive circuit voltage and current are in phase. If we have a ...
2answers
230 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 ...
1answer
167 views

### How possible is producing very high voltage and electric arc by a using this simple setup

I have the basic series RLC circuit in simulation below. As one can see in SPICE simulation, the output voltage at resonance frequency goes upto 1KV: Can I really obtain that much voltage as in the ...
0answers
396 views

### Is it possible to test capacitors on a logic board?

First, I would like to know if it is possible to test a capacitor while it is soldered to a logic board, or does it have to be unsoldered first? Second, is it possible to do so with a multimeter? ...
2answers
2k views

### Conjugate, non-conjugate and single poles in an RLC circuit system

In all the texts I encountered so far, I find the following pole-zero diagram example for an RLC series circuit: The transfer function for the above circuit can be found as: H(s) = XC/(R + XL + XC) =...
1answer
168 views

### LCR circuits with changing input frequencies

simulate this circuit – Schematic created using CircuitLab Ok, imagine an LCR circuit with a resonant frequency f connected to a signal generator inputting a sine wave. The signal generator ...
1answer
834 views

### How to measure High-Frequency inductance of inductor using an LCR meter?

I have a High-Frequency inductor available and I want to measure the inductance using the Rohde&Schwarz HM8118 LCR meter. If I change the frequency to 100kHz and voltage level to 1.5V (max) I get ...
3answers
766 views

### Finding the frequencies for a given phase difference between supply voltage and supply current

I am trying to solve a LCR related exercise, but I ran into a problem. Here is the exercise task and information: An alternating current circuit is composed of a 50 Ω resistor, an ideal inductor ...
4answers
2k views

### LCR circuit with squarewave input: Why does the output take a decreasing amplitude through each cycle?

I understand a square-wave will be made up of a sum of sine waves in the form $$\frac{1}{n}sin(nf_0)$$ So when a squarewave is input to a LCR circut designed to be a bandpass filter, it will ...
1answer
538 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 ...
2answers
2k views

### Using a varactor diode to tune a resonance frequency

I think this is a question is some very elementary circuit design but... I want to use a varactor diode to tune the resonance frequency of a resonator I have built. I understand that a varactor is a ...
2answers
1k views

### DC bias of LCR meter

I need to measure inductors with a small DC bias current. Small is a relative term and here as in won't cause any significant voltage drop in the cables of the LCR meter but enough to put my inductor ...