The
Oscilloscope
at
a
Glance
To
set
up
tile
tl•e
base
There is also a horizontal vernier softkey that allows the Time/Div
knob to change the sweep speed in smaller increments. These
smaller increments are calibrated, which results in accurate
measurements even with the vernier turned on.
• Turn the Delay knob and notice that its value is displayed in the
status line.
The Delay knob moves the main sweep horizontally, and it pauses
at
0.00 s, mimicking a mechanical detent.
At
the top of the
graticule is a solid triangle (
T ) symbol and an open triangle
( V ) symbol. The
T symbol indicates the trigger point and it
moves in conjunction with the Delay knob. The V symbol
indicates the time reference point.
If
the time reference softkey is
set to left, the V is located one graticule in from the left side of
the display. If the time reference softkey is set to center, the
Vis
located at the center of the display. The delay number tells you
how far the reference point V
is
located from the trigger point
T.
All
events
displayed left
of
the
trigger
point
T
happened
before
the trigger occurred, and these events are called pretrigger
information.
You
will
:find
this feature very useful because you
can now see the events that led up to the trigger point.
Everything to the right of the trigger point
T is called posttrigger
information. The amount of delay range (pretrigger and
posttrigger information) available is dependent on the sweep
speed selected.
See "Horizontal System, • on page
118.
15
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