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If the temperature is known and the total of the 
specified section lengths is greater than the measured 
distance to strap, then the calculated unknown 
section length would be negative. This will cause a 
“Yield Sign” to be displayed to the left of the setup 
boxes and “***” to be displayed in the  
“Distance to Fault” and “Distance Strap to Fault” 
boxes as shown below.
 
If the red and green clips are reversed in a separate 
pair RFL measurement, the “Resistance to Fault” 
calculation may return a negative value. This will 
cause a “Yield Sign” to be displayed next to the 
DSTF or RSTF result and “***” in the DTF and 
DSTF boxes as shown below.