Tektronix 2245A Operator's Manual page 38

Controls, Connectors, and Indicators
Figure 2-5. Trigger co ntrols and indicators.
(34) HOLDOFF C ontrol—Varies holdoff time between the end of one A
sweep and the start of the next A sweep.
The HOLDOFF control can increase the minimum holdoff time by at
least 10 times. Adjusting this control can improve triggering stability of
aperiodic signals (i.e., complex digital waveforms).
( 3 ? )
LEVEL C ontrol—Sets the amplitude level on the trigger signal at
which either the A or B sweep is triggered.
Adjusting the LEVEL control to either end of its range, in the AUTO
LEVEL trigger mode, resets the limits of the Trigger LEVEL control
range to the peak-to-peak amplitude of the trigger source signal.
2-12
2245A Operators