Specifications

12
Basic Oscilloscope Controls and Measurements (continued)
Basic front-panel controls
Trigger controls
As we mentioned earlier,
triggering on your signal helps to
provide a stable, usable display
and allows you to see the part of
the waveform you are interested
in. The trigger controls let you
pick your vertical trigger level
(for example, the voltage at which
you want your oscilloscope to
trigger) and choose between
various triggering capabilities.
Examples of common triggering
types include:
Edge triggering – Edge triggering
is the most popular triggering
mode. The trigger occurs when
the voltage surpasses some set
threshold value. You can choose
between triggering on a rising or
a falling edge. Figure 18 shows
a graphical representation of
triggering on a rising edge.
Glitch triggering – Glitch triggering
mode enables you to trigger on
an event or pulse whose width
is greater than or less than
some specified length of time.
This capability is very useful for
finding random glitches or errors.
If these glitches do not occur very
often, it may be very difficult
to see them. However, glitch
triggering allows you to catch
many of these errors. Figure 19
shows a glitch caught by an
Agilent InfiniiVision 6000 Series
oscilloscope.
Trigger voltage
Rising edge triggering
Figure 18. When you trigger on a rising
edge, the oscilloscope triggers when the
trigger threshold is reached
Figure 19. An infrequent glitch caught on an Agilent InfiniiVision
6000 Series oscilloscope
Oscilloscope Fundamentals