Basic Concepts
TDS 200-Series Digital Oscilloscope User Manual
11
AC Line. You can use this trigger source when you want to look at
signals related to the power line frequency, such as lighting
equipment and power supply devices. The oscilloscope generates the
trigger, so you do not have to input a trigger signal.
External (TDS 210 and TDS 220 Only). You can use this trigger source
when you want to acquire data on two channels and trigger from a
third. For example, you might want to trigger from an external clock
or with a signal from another part of the test circuit.
The EXT and EXT/5 trigger sources both use the external trigger
signal connected to the EXT TRIG connector. EXT uses the signal
directly; you can use EXT on signals with a trigger level range of
+1.6 V to – 1.6 V.
The EXT/5 trigger source divides the signal by 5 which extends the
trigger level range from + 8 V to – 8 V. This allows the oscilloscope
to trigger on a larger signal.
Types
The oscilloscope provides two types of triggers: Edge and Video.
Edge. You can use the edge trigger with analog and digital test
circuits. An edge trigger occurs when the trigger input passes through
a specified voltage level in the specified direction.
Video. You can use the video trigger on fields or lines of standard
video signals. Refer to Triggering on a Video Signal on page 53.
Modes
The trigger mode determines how the oscilloscope behaves in the
absence of a trigger event. The oscilloscope provides three trigger
modes: Auto, Normal, and Single.
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