[Power] Haiti power questions

[Richard A. Smith]

On 12/04/2010 06:32 AM, forster at ozonline.com.au wrote:

> 100 chargers is roughly 100 times the current but there is some
> timing misalignment, at least between brands, so the pulse broadens a
> little.

Instinctively I thought that would be the case since they are all kept 
roughly synced by the line frequency but its nice to have confirmation 
from someone else that its correct.

We recently received some cleverscopes at OLPC. http://www.cleverscope.com/

The ethernet model is fully isolated so I can actually set up a test bed 
of 10 or so XO's and take some snapshots of the line current then do 
some frequency analysis.

What did you use for your current measurement? Some sort of CT or a low 
ohm resistor?

What frequencies are you expecting to see the most energy at?

What about at the lower power levels? Say like when the XO is just 
sitting there idle on a full battery?  The current draw is much less but 
the listed pf is much worse.

-- 
Richard A. Smith  <richard at laptop.org>
One Laptop per Child