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Accuracy of LCR meter?
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AVGresponding:

--- Quote from: rs20 on June 30, 2022, 03:29:22 pm ---
--- Quote from: Martin72 on June 29, 2022, 08:59:32 pm ---Hi,


--- Quote ---because its accuracy  is stated as 2% of 2mH
--- End quote ---

According to the sheet you´ve linked, there is no remark that the 2mH range got 2%.
It´s only stated, the BEST accuracy will be 2%, not on which range.

--- End quote ---

I... I realize that this is what a literal interpretation of the column title might imply, but surely this is wrong and the column is just poorly labelled. There's no way that ±(2%+8) figure applies to only one range; and that the manufacturer is making absolutely no claim whatsoever about the performance in the other ranges?

--- End quote ---

Wouldn't surprise me if the accuracy dropped off to 5% or so, and maybe near 10% at the top ranges.



As BravoV's post shows, meters from the well known brands like DER, Uni-T, Peak etc are all good enough for a hobbyist. There are always gotchas ofc; high voltage performance can only be realistically tested using high voltages for example, such as for leakage current/breakdown on caps.
BravoV:

--- Quote from: AVGresponding on June 30, 2022, 05:51:19 pm ---There are always gotchas ofc; high voltage performance can only be realistically tested using high voltages for example, such as for leakage current/breakdown on caps.
--- End quote ---

Yes, the only limitation using this kind of handheld LCR meter is DC high voltage biased measurement, eg: measure a capacitor at their rated high voltage as its characteristics may be different compared to the low voltage measurement signal generated from the handheld LCR meter as its battery powered. Imo, this is not super uber critical for hobbyist.

But for enthusiast, for capacitor leakage measurement, its "relatively" easy with only a DMM with 10M Ohm input and an adjustable DC power supply.

Example -> Quick n dirty method to measure cap leakage

... and you don't need an expensive DMM like this example, just need the one with 10M Ohm input. It worked very well.  :-+
ebastler:

--- Quote from: fyl2022 on June 30, 2022, 07:39:35 am ---you may try a benchtop lcr meter, MATRIX LCR METER MCR-5200 looks nice, it has good accuracy and quality, they sell on amazon, here is the buying link:

--- End quote ---

Any chance you are working for the seller? Right, thought so. Thank you for the impartial recommendation.  >:(
mawyatt:
Monitoring capacitance vs voltage is an interesting experiment to perform with LCR meters. The high K dielectrics used in common ceramic capacitors cause a dramatic reduction in capacitance with applied voltage, aluminum electrolytics also show a capacitance voltage dependance, although tantalums are much better. Generally the "film" types are OK. Monitoring semiconductor diodes is also interesting to see how the junction capacitance varies with applied voltage, these include Schottky, regular signal, rectifier, Zener and transistor junctions.

The cost of a lab type LCR meter that supports a wide range of applied DC voltages (or currents) is high, and many of the moderate cost lab type meters without this feature can be "augmented" with a circuit to isolate the DC from the AC measurement and allow accurate measurements in the presence of DC bias. Here's a link to a DIY device for such.

https://www.eevblog.com/forum/projects/bias-network-for-lcr-meter/msg4091638/#msg4091638

Best,
Martin72:

--- Quote from: rs20 on June 30, 2022, 03:29:22 pm ---
--- Quote from: Martin72 on June 29, 2022, 08:59:32 pm ---Hi,


--- Quote ---because its accuracy  is stated as 2% of 2mH
--- End quote ---

According to the sheet you´ve linked, there is no remark that the 2mH range got 2%.
It´s only stated, the BEST accuracy will be 2%, not on which range.

--- End quote ---

I... I realize that this is what a literal interpretation of the column title might imply, but surely this is wrong and the column is just poorly labelled. There's no way that ±(2%+8) figure applies to only one range; and that the manufacturer is making absolutely no claim whatsoever about the performance in the other ranges?

--- End quote ---

What makes you sure to think it isn´t so ?
As I´ve read the "specs" I´ve stumbled over the word "BEST".
Best means to me that there will be also "normal" and "worst" accuracy - but not shown in this case.
2nd pic below shows a snip of the specs from peaktech 3730 lcr-meter, nearly similar.
That´s more plausible, there are 2% and 5% accuracy mentioned and when you state only the 2%, it will be the BEST accuracy.
(Same on R and C)
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