User`s guide

Mask Test 11
InfiniiVision Oscilloscopes User’s Guide 339
7 Press the Create Mask softkey. The mask is created and testing begins. Whenever the
Create Mask softkey is pressed the old mask is erased and a new mask is created.
8 To clear the mask and switch off mask testing, press the up arrow softkey to return to
the Mask Test Menu, then press the Clear Mask softkey.
If infinite persistence display mode (see “Infinite Persistence” on page 182) 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.