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| East Tester ET4410 ESR Measure |
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| mawyatt:
Don't have anything larger than 1000uF. Here's Beryl RC016M 1000uF @ 16V and a APAQ Tech Polymer EPZ40 1000uF @ 6.3V using the technique with R = 1K shown here: https://www.eevblog.com/forum/testgear/capacitive-impedance-plots-with-sds2104x-plus-bode-function/ Edit: Changed the plots to use R =100 (more test current) and moved cursor to 100KHz. I wouldn't put too much faith into these plots at higher frequencies as the kludge test setup is influencing the results. Best, |
| Martin72:
Absolutely and this is why I´m doing this thing here. To find out what´s going on. The circuit design of the ET4410 is not bad, not simple(actually) and have an advantage against LCRs with chipset like DE5000, it´s "discrete".. I must have a look in my "store" if there are caps here over 1000µ, otherwise I connect several together. |
| The Electrician:
It would be good to have a curve of phase and capacitance vs. frequency. The ST2830 (rebadged Tonghui) has just the right intermediate frequencies--ten of them per decade. Taking measurements at all those frequencies will be somewhat tedious, but we will learn much from such curves. The old fashioned way is to plot points on a sheet of log-log paper. Nowadays you could use Excel or some other plotting program to produce the curves (logarithmic on both axes). The idea is to get curves that look like the green curves in the first image of reply #123 and the green curve of reply #126. Here is what a plot of capacitance vs. frequency for a 1000 uF cap should look like. Notice how the capacitance decreases as frequency increases until a minimum is reached. Then as the frequency continues to increase, the capacitance begins to increase as we approach the self resonance frequency. When we pass the SRF, the impedance becomes inductive rather than capacitive, and the green curve has a discontinuity and goes negative, off the bottom of the screen. |
| Martin72:
The ET4410 got a "list" function, where you can determine measure steps with different testfrequencies and let it run. Problem 1 : It got only 7 steps. Problem 2: will function fine when choosing a main parameter like Capacity, sub-parameters are some kind of buggy. But it got also scpi functionality, so you could create graphs using the interface and a suitable script/program. But with 16 testfrequencies, resolution would be poor. Therefore (not only) I´m playing hard with the thoughts to get the ET4510. It got "endless" testfrequencies between 100Hz and 100khz in 1hz steps. The rest should be the same. |
| mawyatt:
Might also check the Th2830. We got ours from Beich here. Make sure you get confirmation they will honor warranty. https://www.aliexpress.com/item/2261799944889907.html?spm=a2g0o.productlist.0.0.359533bf8sKzAb&algo_pvid=8188e631-20c5-4a39-8843-e3c406bea52f&algo_exp_id=8188e631-20c5-4a39-8843-e3c406bea52f-1&pdp_ext_f=%7B%22sku_id%22%3A%2220000000125229728%22%7D&pdp_npi=2%40dis%21USD%21850.0%21850.0%21%21%21%21%21%40210318b916599065824813386eb34a%2120000000125229728%21sea&curPageLogUid=liLHRYVUMC3e Best, |
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