In edge trigger, the distance between the firing level and the arming level is called hysteresis. The hysteresis determines the sensitivity of the trigger system. A small hysteresis means that the arming and firing level are close to each other. A small signal change will be enough to cause a trigger. A large hysteresis means that the signal change must be large before a trigger is generated. This makes the trigger system less sensitive to noise.

In window trigger, the lower level of the trigger window is controlled through the trigger hysteresis in the software.

Trigger hysteresis can be set for each channel individually.

Changing the trigger hysteresis of a channel in the Multi Channel software can be done in various different ways:

• Right-clicking the channel in the Object Tree and selecting Trigger hysteresis in the popup menu. The hysteresis can then be set as a percentage of the full scale input range of the channel by selecting one of the pre defined percentage values. A User defined... setting is available that also allows to set the trigger hysteresis as a voltage.
• Using hotkeys [ and ] in combination with the appropriate channel selection hotkey(s)
• Using the trigger symbol on the axis that serves as trigger source:
  • For trigger type Rising slope drag the lower edge of the trigger symbol.
  • For trigger type Falling slope drag the upper edge of the trigger symbol.
  • For trigger type Inside window and Outside window drag the lower edge of the trigger symbol
• Right-clicking the trigger symbol on an axis and selecting Trigger hysteresis in the popup menu. The hysteresis can then be set as a percentage of the full scale input range of the channel by selecting one of the pre defined percentage values. A User defined... setting is available that also allows to set the trigger hysteresis as a voltage.
• Clicking the increase/decrease trigger hysteresis buttons and on the channel toolbar