The suffix unit  can’t be used with this command. 
This command CANNOT be used in LIST SWEEP. 
DISPLAY page and CORRECTION page. 
11.8.4 LEVel:ALC (=AMPlitude:ALC) 
The LEVel:ALC or AMPlitude:ALC command enables the Automatic Level 
Control (ALC). 
LEVel:ALC {on,1,off,0} 
AMPlitude:ALC {on,1,off,0} 
{on,1,off,0} 
Where, 
on (1)  Enable ALC 
off(0)  Turn off the ALC. 
SEND>   LEV:ALC?<NL> 
RET>  off<NL> 
This command CANNOT be used in LIST MEAS page , 
CORRECTION page and DCR mode. 
11.8.5 LEVel:MODe? 
The LEVel:MODe? query returns the level mode. 
SEND>   LEVel:MODe?<NL> 
RET>  volt 
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