Delay Key - HP 54501A Operation Reference

delay Key

TImebase
4-2
When using slow sweep speeds (200 ms/div to
and write cycle changes. At these sweep speeds the oscilloscope needs up
25
to seconds to generate a trigger and
is
displayed data updated for each data sample. The HP
accommodate two trigger conditions for acquisition and display:
•
auto triggered scroll
acquire and display data in the auto triggered scroll mode and display
each data sample as it is acquired.
message is displayed at the top left corner of the
acquisition mode.
•
is used
triggered scroll
is needed. Trigg e red scroll acquisitions are not displayed until
is
data available (similar to normal acquisitons) to display.
being sampled the advisory n s to initialize
is
pre-trigger data
post-trigger data is
to complete acquisition where n
will
and continue to countdown until the time
advisory running is displayed
executed and displayed data is updated.
If the
reference point
all
complete because data
is
data pre-trigger and the advisory
Both entry devices are available to change the sweep speed.
Selection of the Delay function assigns delay
trigge
is
delay set to 0 the
Positive delay indicates time after the trigger and negative delay indicates
time before the trigg e r. Therefore,
the trigger event occurs
=
reference
trigger event
acquisition,
is
used when in auto trigger. The oscilloscope
As
it samples and displays a
when in the trig'd mode and scrolled acquisition
collected and n s to complete
This
collected. message indicates tbe time needed
is the remaining time (in seconds, s)
as the write cycle to the scree
left
is
set to the only advisory displayed
is
post-trigger. When right reference
is n s to initialize.
r event occurs at the delay reference point.
a
delay setting of
us
50 after the delay reference point.
+
delay
5 sec/div) the acquisition
tberefore, the
5450lA must
eR
T indicating
As
data
is
displayed while
is
displayed while
has
elapsed The
�iis
.•
is
n s to
is
set
as
the active function. When
us
-50
indicates that
will
this·
all
is
all