Scanning for keltner Channel cross

You want to use the min( ) function to get the lowest value over a period of time.

Here's a link on writing min and max scans.

https://support.stockcharts.com/doku.php?id=scans:advanced_scan_syntax:min_max_scans

and a link on all functions available

https://support.stockcharts.com/doku.php?id=scans:functions

So, for the min function, you add the lookback period first, and the data item second

and [close > min(20, Kelt...) // I forget Kelt syntax

If you want the first time the close crosses, use the crossover operator "x"

and [close x min(20, Kelt...) // I forget Kelt syntax