trigger spot tech.

[химоза]

Дорогие коллеги!
Пришлось переводить кусок технич.описания, вот в чем вопрос:
что имеется в виду под trigger spot и cam trigger??? Ужасно, ужасно....
Контекст: Раздел Triggers

The stand is equipped with shaft and cam triggers, which start and stop the measurement automatically, and a manual foot trigger.
The shaft trigger, which gives a trigger pulse on every shaft revolution, is under the drive head cover. The system points out passing the trigger spot by a signal light (11 in figure 3) and simultaneous buzzer signal. Buzzer signal can be turned on and off with a switch on the control panel (11 in figure 4).
The cam triggers can be used when measuring crankshaft pins. Cam triggers are located in the sensor arms, so that they give trigger pulse always when the sensor arm reaches its highest position during the revolution. When using with ViewScan, check that the ViewScan Measurement Settings/Trigger is set to Keyboard & External, see the ViewScan Operating instructions for more information of its use.

Заранее большое-большое спасибо!