Tektronix 545A Instruction Manual page 18

Operating nstructions — Type 545A
Waveforms Obtained
With The Triggering
Level Control Set n
The + Region
Fig. 2-8. Effects on the oscilloscope display produced by + and — settings of the TR GGER NG LEVEL control.
control is set in the + region, the sweep is triggered on the upper portion of the input waveform; when it is set in the — region, the sweep
is triggered on the lower portion of the input waveform.
portion or the falling portion of the input waveform.
2-8
Trigger Slope
Sweep Triggers
On - Slope
Trigger Slope
Sweep Triggers
O n + Slope
On - Slope
The TR GGER SLOPE control determines whether the sweep is triggered on the rising
Triggering Level
When the TR GGER NG LEVEL
+