Tektronix 502 series, Instruction Manual

Page: 16 / 114

Note: In this illustration of the TRIGGERING LEVEL con­
trol, the AUTOMATIC and RECURRENT positions are not
shown. The "UPPER Region" and "LOWER Region"
shown in the illustration do not actually appear on the
front panel, but are assumed here to aid in under­
standing the operation of the TRIGGERING LEVEL con­
trol.
TRIGGER SELECTOR
v a u r
(SWEEP TRIGGERS
ON + SLOPE)
TRIGGERING LEVEL
LOWER
REGION
UPPER
REGION
Waveforms obtained with the
TRIGGERING LEVEL control e
set in the LOWER REGION
TRIGGER SELECTOR
M A
(SWEEP TRIGGERS
ON + SLOPE)
TRIGGERING LEVEL
Waveforms obtained with the
TRIGGERING LEVEL control
set in the UPPER REGION
LOWER
REGION
TRIGGER SELECTOR
+
UPPER
REGION
(SWEEP TRIGGERS
ON — SLOPE
Fig. 3 -4. Effects of TRIGGERING LEVEL and TRIGGER
SELECTOR control settings.
When the TRIGGERING LEVEL control is set in the
lower region, the sweep is triggered on the lower por­
tion of the waveform; when it is set in the upper
region, the sweep is triggered on the upper portion of
the waveform. The TRIGGER SELECTOR switch deter­
mines whether the sweep is triggered on the rising ( +
slope) portion, or the falling ( — slope) portion of the
waveform.
3-4
OPERATING INSTRUCTIONS — TYPE 502