Thursday December 5, 2013 07:20
Monday December 9, 2013 08:14
dreamliner battery system problems and thought manipulators.
Battery charging circuits may be designed by 'engineers' to charge batteries which are in reasonable shape.
But what does the charging circuit do when the battery is in a failure mode?
Safe shut off and associated warning, electronics failure, meltdown, fire, explosion?
A device performs
1 a simple intended function
2 avoids adverse or benign unintended functions
3 provides adequate warning in event of failure
'Engineers'? Yes. Like the liberal arts 'educated'.
Good engineers are pessimists, we've been told. They consider what can happen in failure modes. And design for this.
Bad engineers do not. And this can lead to engineering disasters.
Uninterruptable Power Supplies [UPS] along with CyberPower [email@example.com] and Underwriters Laboratories [firstname.lastname@example.org]are in focus for an example of bad engineering.
UPSs are dangerous for the reason that when the power switch is off the unit is not disconnected but continues to draw power to charge batteries.
Friday December 6, 2013 13:26
DSO Nano V3 oscilloscope video. Friday December 6, 2013
New 2/6 Amp, 6/12 Volt Battery Charger purchased for reason that it is likely implemented with new intelligent chips.
90 day warranty too. :)
And another free digital multimeter. :)
Thursday December 5, 2013 13:02
CyberPower burn mark. :(
UPS 12V 5Ah battery found on shelf in study?
Don't remember why it was there.
CyberPower and Conext batteries measured in the two volt range.
Both were safely discard in Best Buy bin.
Mistake for reason that we need bad battery to see how charging circuit handles a bad battery.
on Wednesday December 4, 2013 afternoon via UPS [not drone].
Purchased to see how it compares with original 1000 mAh battery seen above.
DSO Nano V3 has a 3.7V 500 mAh battery ... which does not work in our Nano.
Nano comes with an Allen wrench to remove the back.
Replace the Nano battery with above stuck to DSO case back with double-sided sticky tape? :)
HooToo sent complimentary 7 port USB 3.0 with two charging ports.
Charging and USB 3.0 tests in planning stage.
Harbor Freight NiCd fast charger video. Nano can be used to see what the fast charger is doing.
HooToo USB 3.0/charger video.
DSO Nano video.
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