[RASMB] timing of auc runs

Judith Kornblatt judithk at alcor.concordia.ca
Fri Sep 25 13:18:52 PDT 2009


In reply to the same question from two of you, yes, the Rmin and Rmax 
are the same in every run - we never change them.
Judith Kornblatt

smcbryan wrote:
> 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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>> RASMB at rasmb.bbri.org
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>>     
>
>
>   





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