XS series operating manual 
 
XS user manual v0.55  - 146 - 
Operation of the XS 4-wire option in XS hipot function 
 
Reminder:  
The purpose of this option is to detect the presence of the test piece and not to improve 
measurement accuracy (like the 4-wires in ground continuity) 
 
The principle implemented is based on the use of an additional HV cable and a 
2nd GND return cable for voltage re-reading. Detection of the absence of a test piece corresponds to a 
nil voltage re-reading. 
 
 
Option operation phase  
 
 
 
 
Warning 
The option is only active during the test hold phase. 
 
The user wishing to save time in the event of the non-presence of a test piece can stop the test at the 
beginning of the hold phase, as soon as the instrument status switches to connection fault.