SCPI/programming: I can not found the command for turn on/off the channel

Hi, 

Is there a command for turn on and off the probe channel's? 
such as turn on CH1 probe , turn off CH3 probe.

and is there a parameter for ripple measurement under this command ( measu:addmeas ) ? 
or what is the command
I'm using MSO68B, under manual there's a measurement under DPM-> ripple.   

Thanks. 

solved it, thanks.&nbsp;<br> <br> DISplay:GLObal:CH&lt;x&gt;:STATE &lt;x&gt;<br> <br> &nbsp;