Table 20: Ambiguity from for four-step RC ladder network.

FaultAmbiguity with the following

short short ()
openNo ambiguity
short short (), short ()
short short ()
open short (, ), short (), open (), short (), short, short (), open ()
short open (, ), short (,   & ≥20), open (, , ), short (  & ≥22), short (  & ≥23), open (,   & ≥23), short (  & ≥25)
short open (), short (,   & ≥20), open (  & ≥19), short (), short (), open (), short ()
open open (), short (, , ), short (  & ≥19), short (), short (,   & ≥18), open (,  & ≥15), short (  & ≥16)
short open (), short (  & ≥22), short (), open (), short (), open (), short (,   & ≥12)
short open (), short (  & ≥23), short (), open (,   & ≥18), short (), open (), short ()
open open (), short (,   & ≥23), short (), open (,  & ≥15), short (), short (), short ()
short open (), short (  & ≥25), short (), open (  & ≥16), short (,   & ≥12), short (), open ()