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Mastech MS5308 LCR meter with ESR measurement - on discount at the moment
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jarvis:
You could set function to Rs mode then it is 0.001ohm resolution
T4P:

--- Quote from: lister on September 09, 2012, 11:35:57 pm ---Can anyone verify the accuracy of the Tonghui TH2822 meter? The vendor claims ESR is good to: 0.0001 ohm
I don't believe this number...
The new Agilent meter is good to: 0.001 ohm

I purchased the MS5308 recently and I'm not happy with it. I don't care about the size. I can only read ESR to 0.01 ohm though. I can get this quality with many other $100 ESR only meters. I should have read the MS5308 specs closer. I only need ESR and don't care about the other functions since I already have them on other meters.

In my opinion, if you're working with low ESR caps for speed controllers, or want to try measuring low IR battery cells/contacts, the MS5308 meter is not suitable. I will likely return it.



--- End quote ---

Please don't jump to conclusions!
lister:

--- Quote from: T4P on September 10, 2012, 03:31:55 am ---
--- Quote from: lister on September 09, 2012, 11:35:57 pm ---Can anyone verify the accuracy of the Tonghui TH2822 meter? The vendor claims ESR is good to: 0.0001 ohm
I don't believe this number...
The new Agilent meter is good to: 0.001 ohm

I purchased the MS5308 recently and I'm not happy with it. I don't care about the size. I can only read ESR to 0.01 ohm though. I can get this quality with many other $100 ESR only meters. I should have read the MS5308 specs closer. I only need ESR and don't care about the other functions since I already have them on other meters.

In my opinion, if you're working with low ESR caps for speed controllers, or want to try measuring low IR battery cells/contacts, the MS5308 meter is not suitable. I will likely return it.



--- End quote ---

Please don't jump to conclusions!

--- End quote ---

Well, that's why I was asking for confirmation, but I agree I should have phrased my question in a less accusatory tone. I was/am skeptical that the Tongui is more accurate than the new Agilent though, and was hoping someone that is familiar with both meters might be able to comment.
lister:

--- Quote from: jarvis on September 10, 2012, 02:31:37 am ---You could set function to Rs mode then it is 0.001ohm resolution

--- End quote ---

Thanks, that does give an extra digit. I just received the meter and only tested the Cs function since this was all I needed. It's an inconvenience to hop between functions when testing, but I can live with it.
The numbers I get from the two functions are close but the rounding rules are not followed. for example: Rs=0.047 shows ESR= 0.04
Both are taken at the same frequency, 100kHz
Is the ESR measurement equivalent to the Rs measurement but missing a digit to save screen space? I'm confused why they would truncate the reading...and the numbers have some variance
lister:

--- Quote from: lister on September 09, 2012, 11:35:57 pm ---Is anyone using this meter with low ESR caps or low IR battery cells/contacts? I have a lot of variance when measuring in the lower end of the scale <0.03 ohm. Most of my caps are <0.02 ohm, and my batteries are 0.002 to 0.003 ohm

--- End quote ---

I modified my post to be less opinionated, and provide more detail. Does anyone have any opinions about improving measurement at the scales I mentioned? I'll try a calibration this evening to to see if it helps. Attempting all options before returning...

Is ESR equivalent to Rs on the 5308 (except less a digit of precision)? I'm used to R from a multimeter, but R on the 5308 is impedance driven and seems to be the same as ESR.
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