Dear Benjamin (and others likewise afflicted),
Your problem is caused by a bug in Isodat that several new Service Packs
have as yet failed to fix. As to why Isodat 'looses' or overwrites the entry in
the magnet calibration not even the IT professionals in Bremen seem to know
although it has certainly something to do with the fact that 4 certain
configuration files (*.iso) are opened everyday you use the
system.
Since I suspect this is the first time this happened to you, you will
have to start from scratch as if the instrument had just been installed. Close
down Isodat and reboot your PC. From the IsodatNT folder (shortcut on the
desktop) open the Configurator and configure gases and cup settings according to
your needs and instrument. Close the software and for luck reboot the
PC.
From the the IsodatNT folder open the Instrument Control software and
carry out a magnet calibration with CO2. Once this is finished and you saved the
calibration you should be back in business.
To save you having to do all that the next time this happens, open
Windows Explorer, select the drive on which IsodatNT is installed and create a
subdirectory database_backup or config_files_backup (or whatever takes your
fancy). Now go into the subdirectory Finnigan\IsodatNT\Global\databases. Apart
from some more subdirectories you will find a raft of files all ending in *.iso.
Select IsodatGasConfiguration.iso, IsodatSystem.iso and IsodatScanMacro.iso and
copy them into the backup directory you just created.
The next time you end with '???' where a BDAC value should be, go into
the database directory (having closed down IsodatNT first), delete the current
versions of these 3 files (which should show the current date) and copy the
saved "old" versions from the backup directory into
\databases.
Best wishes,
Wolfram
P.S.: The 4th *.iso file that gets perpetually 'updated' is called
IsodatConfiguration.iso but as far as I can tell has nothing to do with this
problem.
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List
Subscribers:
I recently performed a mass calibration on a Delta+
using my CO2
monitoring gas. When the calibration was complete my
gas configuration
for CO2 would not properly set the magnet to the
right spot, nor did it
even seem to try. I looked at the settings
for the gas configuration
and it appears to have used the new
calibration; however, in the
column 'magnet' only a '?' appeared in
the cell for the CO2
configuration.
I tried to manually
replace the '?' with the BDAC value for magnet
steps I got when I
jumped to mass 45 and attempted to save the changes
in the gas
configuration but it never replaced the '?'. Any ideas as to what
is
causing this problem and how to fix it would be greatly
appreciated.
Thanks,
Benjamin Miller
Laboratory
Manager
Idaho Stable Isotopes
Laboratory
[log in to unmask]
(208)885-6512
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