Mask Testing 15
Agilent InfiniiVision 3000 X-Series Oscilloscopes User's Guide 241
 
9 To clear the mask and switch off mask testing, press the  Back/Up 
key to return to the Mask Test Menu, then press the Clear Mask softkey.
If infinite persistence display mode (see "To set or clear persistence" on 
page 131) is "on" when mask test is enabled, it stays on. If infinite 
persistence is "off" when mask test is enabled, it is switched on when 
mask test is switched on, then infinite persistence is switched off when 
mask test is switched off.
Troubleshooting
Mask Setup
If you press Create Mask and the mask appears to cover the entire screen, 
check the ± Y and ± X settings in the Automask Menu. If these are set to 
zero the resulting mask will be extremely tight around the waveform.
If you press Create Mask and it appears that no mask was created, check 
the ± Y and ± X settings. They may be set so large that the mask is not 
visible.
Mask Test Setup Options
From the Mask Test Menu, press the Setup softkey to enter the Mask Setup 
Menu.