Products > Test Equipment
TH2830 vs TH2832
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Martin72:
Hi,

I still can´t read this kind of diagrams, but measuring hundreds of milli-henry with a frequency between 1 and 10khz ?


--- Quote ---If somebody with a 2830 wants to test
--- End quote ---

100µF I could test on thursday with our ST2830, nH I don´t know if we have something like this on stock.

mawyatt:

--- Quote from: Martin72 on July 24, 2023, 10:19:50 pm ---Hi,

I still can´t read this kind of diagrams, but measuring hundreds of milli-henry with a frequency between 1 and 10khz ?


--- Quote ---If somebody with a 2830 wants to test
--- End quote ---

100µF I could test on thursday with our ST2830, nH I don´t know if we have something like this on stock.

--- End quote ---

If referring to the Tonghui LCR diagrams shown, yes they can be confusing, most all LCR meters use them tho. You should see the entire chapter devoted to this in the Hioki IM3536 user manual, it has those graphs and page after page on getting an estimate of the relative measurement accuracy  :P

One must remember that these LCR meters measure the VECTOR voltage across the DUT and the VECTOR current thru the DUT, all the various selectable parameters are derived from these Vector measurements.

If you have an LCR meter that displays the actual DUT measured voltage and current (ours display only magnitudes), this can help in judging if the measurement at hand is within acceptable ranges, some meters also display a message when the measurement parameters are in question. Basically if the voltage measurements are very low then the measurement should be questioned, same for DUT current.

Edit: Note, this is where using the appropriate LCR drive impedance and output drive voltage level can help, the objective is to produce a high enough voltage level across the DUT for good measurement and have enough current flow for a good measurement, but not so high the voltage of the DUT is almost as high as the drive voltage, nor so low as to susceptible to noise. Best to just play around with the various available settings to get familiar with how they influence readings.


Anyway, we find this displayed voltage and current levels very helpful when making measurements and not having to revert to those confusing graphs :o

Best, 
Martin72:

--- Quote ---You should see the entire chapter devoted to this in the Hioki IM3536 user manual, it has those graphs and page after page on getting an estimate of the relative measurement accuracy
--- End quote ---

Same here with my hioki.... :P


--- Quote ---If you have an LCR meter that displays the actual DUT measured voltage and current
--- End quote ---

Voltage I must have a look again, but I know my hioki shows the actual current flowing.
Oh I wish to have it fixed (Backlight, Touchpanel)so I can use it more for comparison in threads like this one here.
KungFuJosh:

--- Quote from: Martin72 on July 24, 2023, 10:19:50 pm ---I still can´t read this kind of diagrams, but measuring hundreds of milli-henry with a frequency between 1 and 10khz ?

--- End quote ---

Vertical lines go from the bottom to the top to tell you the test frequency capability.

The dark outline boxes in the middle are percentage accuracy points. The center box is the highest accuracy, the sweet spot, giving 0.05% to 0.1% accuracy. Every step out from the center is less and less accurate, the worst being from 0.65%  to 1%.

All of the diagonal lines represent the DUT value. I highlighted the value range of 100mH to 1H, and crossed over it with the test frequency of 1kHz to 10kHz. This shows the DUTs in that range, tested at that frequency range, should expect the highest level of accuracy the meter is capable of.

KungFuJosh:

--- Quote from: mawyatt on July 24, 2023, 11:06:05 pm ---Anyway, we find this displayed voltage and current levels very helpful when making measurements and not having to revert to those confusing graphs :o

--- End quote ---

Per your advice, I always leave the Vm/Im displayed on, but that doesn't display on DCR tests.

I only learned to read those charts a couple weeks ago, but they're pretty darn helpful now that I understand. 😅
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