Print

Print


I forgot, but was reminded, to mention the safety of ensuring that your high
voltage, i.e. SOURCE is switched off before making any changes inside the
electrical panel.

-------------------------------------------------
Robert D. Stickrod II, Lab Manager
Idaho Stable Isotopes Laboratory
  www.its.uidaho.edu/isil
Department of Forest Resources
College of Natural Resources, 214
P.O. Box 441133, University of Idaho
Moscow, ID 83844-1133, U.S.A.
[log in to unmask]
lab: (208) 885-6512
fax: (208) 885-6226
-------------------------------------------------



>From: Chris Osburn <[log in to unmask]>
>Reply-To: Stable Isotope Geochemistry <[log in to unmask]>
>To: [log in to unmask]
>Subject: mass calibration and Eager 200 problems
>Date: Tue, 23 Oct 2001 07:20:04 -0400
>
>Hello all,
>
>We're having two separate problems on our Finnigan MAT Delta S system.
>
>Problem 1.  I have recently and successfully upgraded our ISODAT
>software to version 7.5 (running in Real/32) and that software is now
>running the instrument.  I did this because the 486 computer that ran
>v5.2 was in danger of failing and now we have a dual boot system with
>Windows 2000 on a second partition so that we may network this computer
>and archive data more effectively.  I printed out the Cup Configurations
>and methods and entered that information into the v7.5 software.
>
>However, under Instrument Control, the Delta S is having trouble finding
>the peaks in our CO2 reference gas (BTW, our system ran fine before I
>switched the software).  For example, the voltage on m/z 44 was ~2.5
>volts.  Now, it reads ~0.003 volts.  I notice that runing a magnetic
>scan on the reference gas produces peaks that appear to be shifted to
>higher masses, compared to a previous magnetic scan before I switched
>software and computer.  That is, the 44 peak (plotted and normalized for
>Cup 1) actually comes out closer to 49; the 12 peak near 13; 28 peak
>near 32, etc.
>
>Further, I ran a HVDAC scan (HVDAC was 2040 before the switch) and I
>obtain a flatline for cups 1 and 2.  Cup 3 begins to show a peak at
>2100, gently rises, and then the scan stops at 1700.  This also looks as
>if the peak shifted.
>
>Problem 2.  I have a Fisons EA that I am trying to get up an running for
>EA-IRMS; this instrument has been dormant for many months.  I have
>recently traced and reduced a He leak, replaced the oxidation column,
>and set the approrpiate flow levels for the EA and for the Conflo II
>that we have attached.  However, the Eager 200 software is not
>communicating with the instrument.  If I try to run an acquisition, the
>software "beeps" and runs the acquisition, but the instrument does
>nothing.  The connection between the EA and the computer with the Eager
>200 software is intact, but I know of no way to troubleshoot this
>problem and determine if the software is communicating with the EA.  Is
>there any way to use the software to advance the autosampler tray, or
>some other tell tale command, that does not involve a complete
>acquisition run?
>
>Frustrated in DC,
>
>Chris
>
>--
>Christopher Osburn, Ph.D
>NRC Research Associate
>Naval Research Laboratory
>Code 6115
>4555 Overlook Ave. SW
>Washington, DC  20375
>202.767.1700 - phone
>202.404.3371 - lab
>202.404.8515 - fax
>[log in to unmask]


_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp