Subject:
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Surveying MTBF of Edu NXTs
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Newsgroups:
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lugnet.robotics.nxt
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Date:
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Fri, 23 Feb 2007 20:42:18 GMT
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Viewed:
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13793 times
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I have 11 commercial (C) and 25 educational (E) NXT sets. The 11Cs are doing
fine after about 4 battery changes. They have been in use since July 2006 for
about 60 class hours.
I'm sure there's a more empirical way to calculate how much run-time 4 sets of
batteries can produce. My off-the-cuff estimate is that the 11C NXTs have at
least 2 hours of run-time on them.
By comparison, 1 of the 25E NXTs is now dead after less than 10 minutes of
run-time. Another is showing signs of senility out of the box. I suspect that
NXT will die soon.
Does anyone have a better idea of what the mean time to failure is for NXTs?
I'll have to tell our administrators what to expect out of their $8,750
investment.
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Message has 3 Replies:
 | | Re: Surveying MTBF of Edu NXTs
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| (...) What exactly do you mean by "Dead"? I've never seen any NXTs die. I've been told it's possible to reprogram the flash memory enough to wear it out, but that required someone writing a PC program that did nothing but reprogram the flash, and (...) (18 years ago, 23-Feb-07, to lugnet.robotics.nxt)
| | | Re: Surveying MTBF of Edu NXTs
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| (...) You should be able to estimate time-to-failure in the presence of your censored data; people do this all the time in engineering and cancer and many other fields. Steve H seems surprised at the fact that any NXT died and I must say that I am (...) (18 years ago, 23-Feb-07, to lugnet.robotics.nxt)
| | | Re: Surveying MTBF of Edu NXTs
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| (...) Hi Fly, I suspect that your NXTs are fine. On the other hand, I suspect your rechargeables are toast; there is a big difference between those two things. An underpowered NXT will behave erratically, and therefore, as the battery looses its (...) (18 years ago, 23-Feb-07, to lugnet.robotics.nxt)
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