[RASMB] timing of auc runs

[smcbryan]

For your first two experiments at 32K, you are collecting data at 3.975
minutes per scan and 4.455 minutes per scan for the 13:15 and 14:51
experiments, respectively. Assuming you are scanning in the Abs mode (which
the scans per unit time suggests) that is a significant difference between
scan time, if you set the radial increment and scan limits (Rmin and Rmax)
the same for both runs. Did you set Rmin and Rmax to the same limits? 
Our machines won't collect every scan at the set radial increment,
typically a 0.001cm experiment will average 1.0015cm radial increments. But
that value is the same between different experiments, so your differences
are unusual. 
Steve Mcbryant, PhD
Director, PPC Facility
Colorado State University




On Fri, 25 Sep 2009 13:38:01 -0400, Judith Kornblatt
<judithk at alcor.concordia.ca> wrote:
> How consistent should the length of time for a run be? I've been doing 
> the same basic run multiple times - same speed, same number of scans - 
> and the total time for the run, as displayed on the panel of the AUC, 
> varies considerably. For example, 200 scans, 32000 rpm, the times varied 
> from 13:15 to 14:51. More recently, 200 scans at 37000, times varied 
> from about 13 hours to 14 hours. Is this variation normal?
> Judith Kornblatt
> Chemistry and Biochemistry
> Concordia University
> Montreal Quebec
> 
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