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power-up problem in 54512B scope

Question asked by rumreich on Dec 12, 2008
Latest reply on Jan 8, 2009 by ko2054

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Occasionally my 54512B scope powers up with a message that says 1111 EXCEPTION. The message also says to repower the scope while holding in any button to clear the error. This always works and all the self tests always pass. This seems to happen after the scope has been unplugged for a while.

Is this a common symptom for a problem, such as needing to replace the internal lithium battery?

Thanks!

[related scopes: 54501A 54502A 54503A 54505B 54506B 54510B ]

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ko2054 Jan 8, 2009 1:16 PM
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Hello Rumreich, the exception error you are seeing indicates that the NV RAM is getting corrupted. The once key power up is a hard reset that resets all values in the scope including the NV RAM values. The lithium battery does provide backup power to the NVRAM. However, the cal factors are also stored in NVRAM and you did not mention anything about the scope losing self cal. Setup files and waveform files are also stored in NV RAM so you would also lose those if the battery was going bad. It is possible the battery is getting weak. Lithium batteries are good for about ten years and your scope is easily that old. So replacing the battery would not hurt anything. But if you are not losing cal factors, setup files, or waveform files, then the battery is my last suspect. The NVRAM might be going bad and the one-key-powerup resets it correctly like expected.
The self tests just test portions of the acquisition board. the self tests do not check the NV RAM. I hope this helps you out.
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power-up problem in 54512B scope

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