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What happened to Soujourner?



 
 
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  #11  
Old July 17th 03, 07:53 PM
Stanislaw Sidor
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Default What happened to Soujourner?

Newsuser "Henry Spencer" wrote: ...

It's a good bet that its electronics died before then, due to thermal
cycling. (That is probably what happened to Pathfinder itself.)


As I know, Pathfinder suffered from RTC glitch.
The clock after resetting was probably programmed with a default data, and
systems started to function during a night, what made the power cells almost
empty and not usable.
Is it true, or not?

(STS)

  #12  
Old July 18th 03, 12:26 AM
Ian Stirling
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Default What happened to Soujourner?

Stanislaw Sidor wrote:
Newsuser "Henry Spencer" wrote: ...

It's a good bet that its electronics died before then, due to thermal
cycling. (That is probably what happened to Pathfinder itself.)


As I know, Pathfinder suffered from RTC glitch.
The clock after resetting was probably programmed with a default data, and
systems started to function during a night, what made the power cells almost
empty and not usable.
Is it true, or not?


No.
Sojourners batteries had run out, as Henry said, they were primary lithium
batteries.
However, the landers batteries, which were rechargable, had failed
(silver-zinc?) and were no longer able to provide power.

The lander was not coming on due to a timer, but running directly
from the solar panels as soon as the power produced by them got great enough.

--
http://inquisitor.i.am/ | | Ian Stirling.
---------------------------+-------------------------+--------------------------
'Where subtlety fails, we must simply make do with cream pies' -- David Brin
  #13  
Old July 18th 03, 12:36 PM
Stanislaw Sidor
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Default What happened to Soujourner?

Newsuser "Ian Stirling" wrote: ...

The lander was not coming on due to a timer, but running directly
from the solar panels as soon as the power produced by them got great

enough.

But communication sessions runs usually according to RTC timer.
In order to power up the transmitter, the lander had to initiate additional
power systems, which might drain almost empty batteries. If such a scenario
happened during a night, a failure is the most probably implication.

(STS)

 




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