Tektronix 502A Instruction Manual page 12

Operating nstructions — Type 502A
Note: n this illustration of the TR GGER NG LEVEL control, the AUTOMAT C
and RECURRENT positions are not shown.
Region " shown do not actually appear on the front panel, but refer to the
relative graticule position at which triggering occurs.
Fig. 2-8. Effects of TR GGER NG LEVEL and TR GGER SELECTOR control settings.
2-6
The " Higher Region ' ' and " Lower
TR GGER SELECTOR
(Sweep Triggers
On + Slope)
TR GGER SELECTOR
(Sweep Triggers
On + Slope)
TR GGER SELECTOR
(Sweep Triggers
On — Slope)
TR GGER SELECTOR
(Sweep Triggers
On — Slope)
When the TR GGER NG LEVEL control is set in the lower region, the sweep is
triggered on a lower portion of the waveform; when it is set in the higher region,
the sweep is triggered on a higher portion of the waveform.
SELECTOR switch determines whether the sweep is triggered on the rising ( 4- Slope)
portion, or the falling ( — Slope) portion of the waveform.
The TR GGER