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[OT] Casio PRISM Current Draw? - Printable Version

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[OT] Casio PRISM Current Draw? - Tim Wessman - 04-28-2011

Has anyone seen/taken any measurements of the Prism at both idle and running? Different brightness levels?

TW


Re: [OT] Casio PRISM Current Draw? - hugh steers - 04-28-2011

i'll do some...


Re: [OT] Casio PRISM Current Draw? - hugh steers - 04-28-2011

ok, some quick results are:

max current when calculating (also on initial power up) = 30ma.
sitting in the main (color) menu = 11ma.
idling in the calculator (main app) = 7ma
[why this is less than when on the main menu, not sure. unless the brightness is slightly different here].
when screen goes dim = 3ma

one other thing is that the current draw seems to fluctuate by about 1.5ma all the time. not sure why. my numbers above are averages.




Re: [OT] Casio PRISM Current Draw? - Tim Wessman - 04-29-2011

Interesting numbers. Thanks for that. I've been curious since it came out.

TW


Re: [OT] Casio PRISM Current Draw? - Joerg Woerner - 04-29-2011

I expected that you did these measurements at HP already in December 2010 ;-))

Cheers, Joerg


Re: [OT] Casio PRISM Current Draw? - Tim Wessman - 04-29-2011

Nope. Just personal interest is all.

Speaking of which, how about some inspiring CX numbers? :-)

TW


Re: [OT] Casio PRISM Current Draw? - Joerg Woerner - 04-29-2011

Tim,

These were pre-production models and I had to sign a NDA that I don't open the units or do any kind of reverse engineering.
I sent them back to Dallas a few days ago.

Regards,
Joerg


Re: [OT] Casio PRISM Current Draw? - Tim Wessman - 04-29-2011

Well, how about on just any other nspire model? I don't think I've seen power readings on that either.

TW


Re: [OT] Casio PRISM Current Draw? - Joerg Woerner - 05-02-2011

Tim,

Give me a few days - it is not that easy.
The connection of the two 3V strings to the PCB isn't that straight forward.

Regards,
Joerg