B&K Precision 2542B-GEN - Manual - Manual (Page 66)

Basic Operation
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Trigger Control MENU key
Press the trigger control MENU key to show the TRIGGER
menu and then press the Type softkey to select Edge, Pulse
or Video.
Set to 50% key
Press the 50% key to set the trigger level to the 50%
amplitude level of the trigger source waveform.
Force Trigger key
Press the FORCE key to force an immediate trigger event,
even in the absence of a signal. This function is useful in
following situations:
If you do not see a waveform on the screen when using
Normal trigger mode, press the FORCE key to acquire the
signal baseline to verify that it is on the screen.
After you press the SINGLE key to set up for a single shot
acquisition, you can press the FORCE key to test and verify
the control settings.
Trigger Level Control
Use the trigger level control knob to adjust the trigger level.
When you change the trigger level, a horizontal red line
temporarily appears to show you the level position on screen.