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angboontiong
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RB800 Operating temperature...

Wed Dec 05, 2012 9:26 am

Hi,

Just wonder know, in the system > health it's show the CPU or the environment temperature?
refer to the RB800 tech spec, Temperature range -75℃ to +65℃, this is CPU or environment?

any issue with this temperature (attachment).

thanks.
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normis
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Re: RB800 Operating temperature...

Wed Dec 05, 2012 9:29 am

specifications talk about environment
RouterOS shows CPU
 
angboontiong
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Re: RB800 Operating temperature...

Wed Dec 05, 2012 9:59 am

specifications talk about environment
RouterOS shows CPU
Dear Normis,
Then the CPU will hang when the temperature up to ??? degree ???

i notice it will hand when CPU up to 85 degree.
 
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normis
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Re: RB800 Operating temperature...

Wed Dec 05, 2012 10:00 am

85 is possible, maybe more.
 
angboontiong
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Re: RB800 Operating temperature...

Wed Dec 05, 2012 10:34 am

85 is possible, maybe more.

Dear Normis,
last question, the FAN power tapping is providing 5V ?? mA???
 
poli5681
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Re: RB800 Operating temperature...

Wed Dec 05, 2012 2:11 pm

As far as i remember there was a hardware bug on the early RB800s, which led to incorrect temperature readings.
We currently still have 2 of them running, without any problems so far but with ridiculous temperature readings.
Soon after the issue was fixed; Still have one RB-800 here with a temporary fix for this issue; was published in the forum a while ago...
 
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Ibersystems
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Re: RB800 Operating temperature...

Sun May 19, 2013 10:10 pm

-75 degree?!

Sure? Any project at very cold temperatures?

I have to make a project in fridges and freezers at very low temperatures.. I need examples please!
 
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normis
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Re: RB800 Operating temperature...

Mon May 20, 2013 9:30 am

It should work, if you put it there before it gets to -75c. the board will keep itself warm, especially if it is in some enclosure. if the board has been frozen at -75c for some time, it could have trouble booting and would need some pre-heating. However, if you bring it in there, and turn it on while it is still warm, it should be able to keep working in -75c.

we could make a -75C tests of the RB800 in our temperature chamber, but it will take a few days for a result.
 
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Ibersystems
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Re: RB800 Operating temperature...

Mon May 20, 2013 11:11 am

-75 is too much. I need to use it in big freezers at -25. I think 433AH could work also.
 
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normis
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Re: RB800 Operating temperature...

Mon May 20, 2013 11:13 am

I think all RouterBOARDs are tested from -35C
 
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honzam
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Re: RB800 Operating temperature...

Tue Jun 18, 2013 6:55 pm

It is posible downgrade CPU frekvency to 400Mhz on rb800? It show: Couldn´t perform action - frekvency is not suported on this board.
Solution?
 
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honzam
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Re: RB800 Operating temperature...

Fri Jun 21, 2013 10:41 pm

Solution is downgrade memory data rate
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