Electronics > Projects, Designs, and Technical Stuff

ESR meter

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nanofrog:

--- Quote from: Lassivv on January 12, 2018, 02:11:06 pm ---Just thinking what is best budget choice to measure ONLY esr. Not need that transistor, resistor, etc testers. Of course if you guys are that thinkings that price 8-15 transitors/resistor/capacitor/esr testers are accurate enough well i happy take links to good one :)

I thinking that just ESR meters are very much accurate and better reliable result, than that 8dollars cheap "multi" testers. Maybe i be just wrong.
--- End quote ---
In terms of reading ESR, a dedicated ESR meter is a better choice than a DMM. The main reason is a DMM can mislead you (i.e. make you think it's good when it isn't). They can usually test a wider range of values than a DMM as well. They're good for other things as well, such as measuring track resistance in order to find a fault.


--- Quote from: Lassivv on January 12, 2018, 02:11:06 pm ---Can be kit or ready. Price point is about 30-100dollars. And if possible europe shops are better because customs, taxes, postages etc :)

I know only Black one what Eevblog Dave use if i remember right something:  Dick Smith Electronics  but i think that not get anymore and price going with customs, taxes and postages quite high.
--- End quote ---
In the case of Dave's unit, his is a Silicon Chip model (latest).

Given that you're into repair projects, you might want to consider an LCR meter instead. And in the case of ESR, they usually offer multiple excitation frequencies. For example, if you need to test an electrolytic in a linear PSU, you can set the frequency to 100Hz (2 * mains frequency) in order to get accurate results for it's operating conditions. And they also test inductors and capacitors as well.  ;)

FWIW, the DER EE DE-5000 would fit your budget. And if you want it faster than the default method, the increase isn't that much IME. Kits with some test fixtures won't stretch your budget by much at all; say ~$20 over just the meter (example; includes the ground/guard wire, alligator clip fixture, and tweezer fixture).

These can also do 4-wire measurements. Lots of info here in EEVBlog, including teardown photos. Other stuff on YouTube as well. Excitation frequencies are 100Hz, 120Hz, 1kHz, 10kHz, and 100kHz.

If you'll note, the sellers linked are all in Japan and offer free shipping. What I've no clue to, is the customs, duties,... that your government would levy. Perhaps ask the seller to mark it as a gift to minimize/eliminate these fees?  :-//

For disclosure, I do own one of these as do a number of other members (info on great deals is very popular for some reason...  :P). Very nice bit of kit for the money IMHO.

In regard to Tigr's request of a unit sans transformer, the DER EE DE-5000 is such an animal, so you might want to add it to your short list for comparison.


--- Quote from: Lassivv on January 12, 2018, 02:11:06 pm ---This is only one what i finded: http://clientes.netvisao.pt/greenpal/evb1.htm

This looks quite good and get kit version too. Seems better than china clones on ebay, but anyone know is that ones ok?
--- End quote ---
It's the same as as the Silicon Chip ESR Mk.2 by Bob Parker linked above. The page you linked even states this is the case, and has a link to Bob's page.  :)

tigr:

--- Quote from: nanofrog on January 13, 2018, 01:50:14 pm ---Given that you're into repair projects, you might want to consider an LCR meter instead. And in the case of ESR, they usually offer multiple excitation frequencies. For example, if you need to test an electrolytic in a linear PSU, you can set the frequency to 100Hz (2 * mains frequency) in order to get accurate results for it's operating conditions. And they also test inductors and capacitors as well.  ;)

--- End quote ---
You can do it yourself at different frequencies. ;)

The Electrician:

--- Quote from: tigr on January 13, 2018, 03:24:25 pm ---
--- Quote from: nanofrog on January 13, 2018, 01:50:14 pm ---Given that you're into repair projects, you might want to consider an LCR meter instead. And in the case of ESR, they usually offer multiple excitation frequencies. For example, if you need to test an electrolytic in a linear PSU, you can set the frequency to 100Hz (2 * mains frequency) in order to get accurate results for it's operating conditions. And they also test inductors and capacitors as well.  ;)

--- End quote ---
You can do it yourself at different frequencies. ;)

--- End quote ---

tigr, your posts would be much more useful if you would add more text describing what the pictures you post are illustrating.

What do you mean "...do it yourself".  Are you suggesting that your reader should build their own LCR meter?  Does the picture show an LCR meter that you built yourself?  If so, the tell your readers all about it.  What frequencies does it cover?  How much did it cost you to build it?  Where did you get the plans?  Show a picture of the entire thing.  Tell us what it is measuring and at what frequency.

nanofrog:

--- Quote from: tigr on January 13, 2018, 03:24:25 pm ---You can do it yourself at different frequencies. ;)

--- End quote ---
To what degree are you talking about?  :-//

Based on what I can tell from your latest photo, the item appears to be an LCR (seeing both ESR & C displayed simultaneously). I'm also seeing 1k, which I presume is the test frequency.  And based on every other LCR I'm aware of, it's not infinite; just a handful of choices (i.e. 100, 120, 1k, 10k, 100kHz on affordable models IME).

There are units with a greater range, such as the Wayne Kerr 65120P (120Mhz version). Very nice, but the sticker shock is a tad much as it sells for $30k without any options.  :o


--- Quote from: The Electrician on January 13, 2018, 03:42:24 pm ---tigr, your posts would be much more useful if you would add more text describing what the pictures you post are illustrating.

What do you mean "...do it yourself".  Are you suggesting that your reader should build their won LCR meter?  Does the picture show an LCR meter that you built yourself?  If so, the tell your readers all about it.  What frequencies does it cover?  How much did it cost you to build it?  Where did you get the plans?  Show a picture of the entire thing.  Tell us what it is measuring and at what frequency.

--- End quote ---
Agreed.

Posting them right side up would be helpful as well.  :P

Svgeesus:

--- Quote from: nanofrog on January 13, 2018, 01:50:14 pm ---FWIW, the DER EE DE-5000 would fit your budget. And if you want it faster than the default method, the increase isn't that much IME. Kits with some test fixtures won't stretch your budget by much at all; say ~$20 over just the meter (example; includes the ground/guard wire, alligator clip fixture, and tweezer fixture).
--- End quote ---

That meter says that it does 4-wire measurement, yet the photo shows only three connectors, one of which is for a shield. Are the other two special two-wire connectors with force and sense on the same plug?

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