Stable Isotope Geochemistry


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Paul Eby <[log in to unmask]>
Reply To:
Stable Isotope Geochemistry <[log in to unmask]>
Fri, 13 Feb 2004 10:43:36 -0800
text/plain (2216 bytes) , text/plain (161 bytes)
Here is another thought:

When we lose a signal on our 252, we can always still get the signal on the
chart recorder. Not the virtual recorder in the software, but the old
physical recorder that connects directly to the amplifier outputs.

That indicates that at least in our situation, the problem is with the
software, the computer, or the interface card. The cups and amplifiers are

Paul Eby

University of Victoria

At 10:51 AM 2/11/2004, you wrote:

>HI Howard--
>Just a thought--amplifier problem???  Have you considered swapping
>amplifiers with one of your unused cups, assuming they have the same
>amplification?  If your system can have two amplifiers per cup, put a
>spare amplifier in the second slot for cup 2 in case it is getting
>confused and trying to read the alternate amplifier signal (just
>guessing here).
>good luck
>take care
>Howard Sanford wrote:
>>At 12:31 PM 2/11/2004, you wrote:
>>>I am not sure if this is applicable but we have had this happen on
>>>our 251
>>>usually after disconnecting cables.  It was a poorly seated connector on
>>>the main data acquisition board.  If you have not done so disconnect and
>>>reconnect all relevant cables.
>>That would seem to match the recent swapping of computers and such,
>>but if
>>it was simply a bad connection, why only lose cup 2? And why would others
>>report only losing the same thing? I would expect to see random
>>communication problems if that were the case. EA not starting, losing
>>vacuum readings, losing different cups, etc. Any ideas on how to check
>>this without having to restart things? Is there somewhere to check to see
>>if a bit got missed in the last exchange of initialization calls?
>>BTW, thanks for your speedy response. My clock shows that you
>>responded to
>>my message one minute before I sent it! Ever consider going into customer
>>service, or pizza delivery?
>>Howard Sanford
>>North Carolina State University
>>Dept. of Soil Science
>>Box 7619
>>3114 Williams Hall
>>Raleigh, NC 27695
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