All specifications are ensured only under a single display. 
  At least 1 hour of  warm-up time is required before 
applying these specifications. 
  Make sure that the Sense LO terminal to COM port is 
limited to 100Vpk, the Sense HI to Sense LO terminals 
are limited to 200Vpk and the COM port to earth is 
limited to 500Vpk. CAT II 600V. MAX DC1000V, AC 
750V