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작성자원더우만 조회 12회 작성일 2021-10-27 11:19:09 댓글 0

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Instrument Basics: LCR Meter - Workbench Wednesdays

Learn how to use an LCR meter, such as the Tenma 72-10465, to measure reactive components. An LCR meter uses an AC signal at different frequencies to characterize capacitors, inductors, and even resistors. They can also provide impedance measurements. These include phase angle, ESR, quality factor, and dissipation factor. You can even use the 72-10465 to sort components by their tolerance range: https://bit.ly/2xeltjh

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Borys Andreyev : Thank you very much, James! Very clear explanation. Even with my huge experience I learned something
Upcycle Electronics : Thanks James.
I wish someone would do an upload like this but more focused on inductors. Specifically, inductors as they relate to basic DC-DC switching converters. It is quite easy for a hobbyist to build a MC34063, UC3842, or TL494 based switching converter now. There are even a few online calculators that greatly simplify the required math. The difficulty I've experienced is understanding the correct way to test and verify the magnetic components.
For instance, I have removed the transformer from a working converter, after measuring the input/output. I then disassemble it, count the secondary turns, and rewind it to my desired turns to voltage ratio, (while cognizant of the secondary to primary current relationship). I want to learn to measure and quantify a design like this hack for a more intuitive understanding. I want to learn how to qualify magnetics of an unknown origin or with an incomplete datasheet.
World wide137 : Does the meter remember the calibration of a particular probe after shutdown?
SevenDeMagnus : Hi, thanks. Is this a good buy? This LCR meter (for occasional video game console repair attempt) that looks like a multi-meter? Can you measure the capacitor without desoldering it with this meter: 

2J` P1510

Thank you. By the way, what's the difference between and ESR meter, multi-meter and an LCR meter?

God bless, Happy Easter! He is risen.
Mark Henderson : Can someone out there help me with why the two different LCR meters that I own give me completely different inductance readings for a simple transformer 120v primary??? I admit both meters are somewhat cheap. The first one is a Velleman DVM 6243, and I just purchased a GME LCR 200 from All Electronics catalog. The Velleman shows 6.7 mH and the GME shows 13 mH (twice the amount). Could this be something where the signal frequency that each individual meter puts out has to be factored in??? Most videos I saw didn't show having to do anything like this. The clips were hooked up and up came the reading. I can't see even two cheap meters being this far off with such a common 120v winding (actually going from a center tap to end here). Any expertise advice would be appreciated.

TSP #193 - Tutorial & Experiments with Keysight E4980A 20Hz - 2MHz Precision LCR Meter

In this episode Shahriar describes the subtle internal operation of the Keysight E4980A precision LCR meter. This 0.05% grade instrument offers measurement frequency range between 20Hz - 2MHz with a wide range of advanced functions such as binning, internal DC source, internal bias control as well as extreme dynamic range across the entire frequency span.
Several test fixtures are presented with accompanying measurements. Lastly, a simple parallel plate capacitor is measured to demonstrate the effect of various dilectric materials on the total capacitance.

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shazam : Since you have this marvelous instrument (hopefully with option 001) could you measure a 1 to 10 uF MLCC (6V, 20V, 50V) while sweeping the DC Bias to ~ 40 V (inst. max)? This would be quite enlightening to many engineers who have these capacitors in buck, or especially boost power supplies of >12V as to why there is so much ripple and instability which is not shown in the SPICE models?
w2aew : For the electrolytic & tantalum, using a 1V test signal, shouldn't a DC bias be applied so that the cap doesn't get reverse biased on the negative half cycle?
Ziferten : It would be interesting to see the equivalent parallel resistance of a bunch of equal valued capacitors of different dielectrics. Particularly with film caps. Polystyrene is legendary for low leakage, but I recall an article by Bob Pease about polypropylene's superiority in this regard.
Astronomy Lab : Electrical engineers: "Jmaginary"
Simon Fitch : Thank you so much! It's so nice to see those things you've been taught, and have just accepted for years, actually demonstrated. Great, great job.

How to use an LCR Meter

This video demonstrates how to select the test frequency, and measurement mode on an LCR meter to obtain accurate readings for capacitance, and inductance measurement.

http://www.bkprecision.com/products/component-testers/lcr-meters/879B-40000-count-dual-display-handheld-lcr-meter-with-esr.html

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Please watch: "9830 Overview"
https://www.youtube.com/watch?v=vnG4D7RYzBY
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B&K Precision Corporation : @ljay0778 Thank you for recognizing the quality and value of the meter used in this video. While you are correct that the electrolytic capacitor used had a rated value printed on it in micro-farads, the meter, however displays measured values over 4,000 micro-farad as milli-farads, so the video presenter was mentioning the measured capacitance value of 5.58 milli-farad.
ljay0778 : Before the metric system of units was in widespread use in the U.S.
mfd was the standard way to represent microfarad. Pico farads were
labeled mmf (micro micro farads).
maynardr6 : I am looking to buy the 879b, but I would like to understand two things about frequency. Why does this meter only go to 10khz? Your cheaper ESR meter specifies "in-circuit" specifically, but this one does not. Does the high frequency have something to do with in-circuit testing? Basically, I want the features of this meter with the ability to test for bad capacitors without removing them.
Manoj Soni : Can you Please tell me how do I measure the L/R ratio and electrostatic noide rejection ratio of a twisted pair cable
snaprollinpitts : you didn't show us HOW to use the meter!

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