HI Andy--

The listed values only play a direct role in certain calculations, e.g. 
H3+ and total area (e.g area off mass 44 + (area of mass 45)/100 + (area 
of mass 46)/300--and I'm presuming they are using the listed resistor 
settings to determine relative ratios of the different masses, but 
haven't tested that yet.

Your voltage output does not change if you change the value of the 
resistor in the software, and it should not affect the per mil values.

The "high amplification" is the secondary resistor/capacitor set on the 
amplifier card--it can be any set you have installed.  Please note, if 
you only have the primary one installed, it will use that even if you 
try to tell it to use the secondary one.

The amplifier tests (under the diagnosis program) gave us some funky 
"resistor" values.  I haven't had time to look over that to figure out 
why it did that--aka, what did I do wrong...

take care

gerry

Andrew Schauer wrote:
> When installing IsoDat, after one chooses the instrument, one must then indicate which cups are installed, what cup should have peak centering capacity, and what the resistors are associated with each of those cups. One can also go back and change these resistor settings using Configurator.
>
> 1) Does the selected resistor actually impact the amplification or is this more of a bookkeeping feature?
>
> 2) Is the first resistor always default and the second resistor only used when "high amplification" is selected, or does the instrument know which resistor has a higher amplification?
>
> Thank you!
>
> andy
>
>  
> Andrew Schauer
> ISOLAB
> Department of Earth and Space Sciences
> University of Washington
> Seattle, WA 98195 
> 206.543.6327
> [log in to unmask]
>
>