(POS/NEG) - Permits "window" triggering, i.e. triggering on either
a positive- or negative-going signal edge, whichever occurs first.
When the POS/NEG trigger slope is selected, the Trigger LEVEL
control (33) is turned counter-clOckwise for bi-slope triggering
at base line level. Turning the Trigger LEVEL control (33)
clockwise generates a variable amplitude trigger window which is
symmetrical with respect to the center of the screen (internal
trigger source) and to ground (external trigger source). When
using an internal trigger source, the user may produce an
asymmetrical window by offsetting the base line with respect to
ground via Vertical OFFSET control (32).
In the window triggering mode no trigger will occur while the
signal remains within the window. A signal which exceeds the
pre-selected limits will generate a trigger and the signal is
stored into the memory, as shown in the following figure.
Parml
STATUS
¯ M
WINDOW TRIGGERING
Figure 5.4
In the above figure the trigger level is ± 3 divisions as indicated in
the Abridged Panel Status field.
Manual Operation
5-8
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