What exactly is the question?
The option itself is available in the ISODAT software but to use it you must have a second resistor physically installed on your board (what is normally the case in the standard CNOS setup that you order). You can either order the resistor you need (depends on what isotope ratio you are behind) through thermo or directly from the manufacturer. It can be installed by everybody having some basic practical experience with IRMS hardware.
> Am 25.01.2018 um 23:06 schrieb Hill, Brett <[log in to unmask]>:
> Hello all,
> I am hoping to find someone out there that uses the switching resistors available in the Delta V to change signal amplification to allow analysis of both enriched and naturally abundant 15N and 13C. I have a few questions about your instrument set up. Or maybe no one does this and we are the only ones who actually considered this sales gimmick as feasible?
> Brett Hill
> Stable Isotope Lab
> Agriculture and Agrifood Canada
> Lethbridge Research and Development Centre
> 5403 1st Av. S.
> Lethbridge, AB.
> T1J 4B1
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