Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [lcr]

41 questions
17
votes
4 answers

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 manual.
max5555
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1 answer

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 I can drive the coil without damaging the…
Toun
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5
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2 answers

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 circuit, the natural state would be that in…
math and physics forever
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3 answers

What is the difference between ESR and DCR?

I am measuring the inductance of a large coil using an LCR meter. I am using the series equivalent measurement mode at 100 Hz. Why does the LCR meter show that the ESR is 656 Ohm and why does my multimeter show a DC resistance of 61.5 Ohm? I would…
Rens
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2
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1 answer

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 frequency? I just need to measure a capacitor,…
AJ_Smoothie
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2 answers

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
Chern-Simons
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1
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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 running online at low speed. So I'm wondering if…
Adisu Teshale
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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 this I used the current decay…
math and physics forever
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1
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2 answers

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 selected test frequency: 100Hz: 164mH, 60 Ohm 120Hz:…
Stefan
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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 instrument can effectively measure my device's…
Luiz Fernando Vieira Dias
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2 answers

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 Unbalanced". The same problem was described a few…
Charly
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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 as the environmental conditions change; its…
Devesh
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2 answers

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, and I know the basics of LCR, but I am not sure…
Aimkiller
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2 answers

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 circuit with an AC voltage source, a capacitor, an…
user1897830
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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 simulation in practice by using a function…
user16307
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