That worked thanks - interestingly it only pickups the integer part of the number, not the decimal places which seem to be there. not a big deal as I’m trying to capture big variations of a volt or more, but technically intriguing why it chops off the decimals.
Substitution variable is $$DSR colon (99) colon. I do not think it will work as substitution variables were not discussed in the scripting help guide.
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