There are many modes to start the scope, the digitizer. There is auto trigger, which is continuously triggering on internal time base, and normal triggering that is continuously triggering as long as a trigger condition is met. For example, it could be a voltage level. Another mode is the single shot trigger, which allows the user to arm the oscilloscope and take a single capture either through a remote command, or by pushing a button on a front panel. Also, it is possible to trigger on any of the four analog inputs or on the digital channels in a mixed signal environment. Lastly, there is the choice of an external trigger available.