In situations when the actual measuring Vac or 
Iac goes beyond the extent that the ALC can 
regulate, a warning message, “Failed! ALC 
can’t regulate!”, will be shown at the bottom of 
the screen to indicate to the operator that the 
ALC can no longer regulate Vac/Iac.  
An asterisk will be shown beside the LEVEL V 
or A unit when the ALC is turned on. 
The Nominal Value parameter becomes displayed and 
settable only when MON1 and MON2 are set in either Δ 
or Δ% modes. The Nominal Value and the measured 
main parameter will then be used to perform the Δ or 
Δ% calculations.