Case Analyzer - quit with 30 secs left on charge cycle

[dsidab81]

Is there any way to upload a partial case analyzer csv, or at least the formulas used to derive the time constants and case usb charge fields?

My pc freakin went to sleep with 30 secs left on the second hour (charge cycle)

[John]

You can get pretty close. You're trying to derive a steady state offset (degrees above ambient when the charger is on, but there's no charge current) and then the temperature rise per amp. 

If you know the room temperature, the first one is just what the device cooled to before it started. The second you can get from the steady state values at the three test charge rates. 

The time constants are a little trickier, but you could do a regression in excel to get them. Or just figure out how long it took to rise to 63% of the final steady state value. 

[dsidab81]

Thanks, John.  Actually I assumed it was only the two test states, first setting base temperature and then charging.  You say there are 3 charge states, the roughly two hours of data wouldn't be enough.  Time to run this on a stand alone pc outside of our network environment!

[John]

Nope, it takes four to six hours to get through the whole cycle. 

Maybe overkill, but we figure people only need to do it once per mod design. We just let it run overnight.