KEITHLEY 228/228A

[Inverted18650]

I love my 228. (sold the 228A). I also use it for battery diagnostics. I build custom 18650 battery banks and this unit has made my life so much easier. I had to sell the other unit but now am in the market to buy another 228. I found they are easy enought o repair and calibrate and once in spec, they are worth their weight in gold.

[cncjerry]

If you attach good voltage and current meters to it with GPIB you can monitor the charging current and voltage over GPIB.  I use Visual Basic in Visual Studio 2017 Community Edition for all my GPIB code. Much easier to code than Labview.  You could probably do peak detect as well but by your ID you look like a Lipo guy.

Jerry

[Inverted18650]

I only had one GPIB connector and I sold with the 228A a while back. So I haven't had any data logging ( or done anything at all) in the last six months. I just watched "Joe Smith" on YouTube, "joeqsmith" on the forum; his video about the Owon B41T+ and got excited despite his effort to get the bluetooth working a year ago. I just asked the company for a quote on four of the units for my lab to re-investigate the data logging functions. I hope to run those with the 228 and my Fluke 8202 and see what results I can achieve. I built a custom Arduino-based, 50 cell, 18650 test gig that does most of my single cell data and use the Keithley for my pack builds to test my DIY BMS (which i haven't released yet, due to minor set backs).

I would love to learn more about the software side of the 228 and if you have the time, maybe you can share the details and some sketchs with me.

[bitseeker]

Hello all, I am back on the forum and if anyone needs any of these units I have about 12 left. Some are the silver before I figured out how to use the gold finger outline in easyeda. I also have the screw posts, but not the small shorting links for the sense wires; i just cut and drilled so old sheet cooper for those. Reply or message me if you want any, just cover shipping.

Welcome back, Inverted.

I only had one GPIB connector and I sold with the 228A a while back. So I haven't had any data logging ( or done anything at all) in the last six months.

What made you choose the 228 over the 228A for your lab?

I just watched "Joe Smith" on YouTube, "joeqsmith" on the forum; his video about the Owon B41T+ and got excited despite his effort to get the bluetooth working a year ago. I just asked the company for a quote on four of the units for my lab to re-investigate the data logging functions. I hope to run those with the 228 and my Fluke 8202 and see what results I can achieve. I built a custom Arduino-based, 50 cell, 18650 test gig that does most of my single cell data and use the Keithley for my pack builds to test my DIY BMS (which i haven't released yet, due to minor set backs).

I would love to learn more about the software side of the 228 and if you have the time, maybe you can share the details and some sketchs with me.

I look forward to seeing more about your experiments with the battery logging and testing.

[Inverted18650]

If you attach good voltage and current meters to it with GPIB you can monitor the charging current and voltage over GPIB.  I use Visual Basic in Visual Studio 2017 Community Edition for all my GPIB code. Much easier to code than Labview.  You could probably do peak detect as well but by your ID you look like a Lipo guy.

Jerry

Jerry,

I am going to take a look at Visual Basic and wonder if you could email me any "sketches" if thats what they are called, for the 228. I did learn and use Labview in conjunction with the K2000 DMM a few times, and while it was initially hard to program, once up and running, it worked well. I am not a "professional engineer,"as it were, I am medically ret mil, so I learn most of this on my own. I do have an entry level degree and still take some courses at the local Univ and online from time to time to enhance it, but I enjoy the "frustration" of doing it the hard way. I thought I would go on and try to get a masters degree but that's not likely now.