ITTSB.EU Blog Forum
Components Testers: LCR Meter | Function generators | Programmable DC Electronic Load => Handheld LCR Meter => Topic started by: Kiriakos GR on April 20, 2014, 10:46:16 AM
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One Japanese Blogger by the nickname tek2465, moved ahead and created one accessory for the DE-5000 LCR, which seems to extend it capabilities as battery internal resistance meter.
While the concept as electrical theory and assembly looks simple, what is a true challenge is the proper wiring for a Kelvin type probe.
It seems that the Japanese Blogger even if he wanted to have a Four-terminal sensing (Kelvin sensing) leads in his design, he ended using four wires but their connection is not a true Kelvin sensing setup.
He was forced to connect the two positive wires together on the lead of the capacitor.
By doing so the positive V sense pad on the DE-5000 is not in use.
From the other hand the negative V sense pad and the minus pad are in use.
Even so this rough technically design seems to work with good results.
One 10M Ohm resistor in parallel warranties stable impedance, and the capacitor is blocking DCV and protects the LCR input.
Mr. tek2465, he did tested his design in several frequencies range.
In one of his experiments he recorded the resistance of one AA Eneloop as follow.
100Hz = 0.17 Ohm
120Hz = 0.15
1K = 0.137
10K = 0.137
100K = 0.145
Because these scattered parts of this man experiments are written in Japanese, I thought as good idea to share this information also with the ITTSB readers.
And below are the original links of this project.
Some time back I was had in mind to present reviews from modern battery analyzers, but this idea it did not prosper, the very few manufactures of such devices they have overestimate the value of their equipment, and possibly they do feel awkward in the idea to offer such a tool for a product review, especially when their retail offerings starting at 1500$ American.
Even so, by doing my homework of how these tools operate, I did discover that the industry standard in battery diagnosis is the frequency of 1 KHz.
Parts assembly.
http://blogs.yahoo.co.jp/tek2465/7968952.html (http://blogs.yahoo.co.jp/tek2465/7968952.html)
AA Eneloop / Alkaline - comparison.
http://blogs.yahoo.co.jp/tek2465/8112100.html (http://blogs.yahoo.co.jp/tek2465/8112100.html)
Cordless drill batteries tests
http://blogs.yahoo.co.jp/tek2465/7968954.html (http://blogs.yahoo.co.jp/tek2465/7968954.html)