Present Key; Holdoff Key 6·16; State Trigger Exercise; Instrument Setup - HP 54501A Operation Reference

present Key

holdoff Key
State Trigger
Exercise

Instrument Setup

Trigger Menu
6-16
To change the pattern:
•
Press the selection key until the bit you want to change
•
Rotate the knob until the desired setting
if
•
Select the arrow
knob until the desired settings appear.
will
A trigger event be generated on the selected edge when the pattern is
is
trne and is present selected. or a trigger
false and not present is selected.
Pressing the holdoff key assigns the entry devices to control holdoff.
Holdoff disables the trigger circuit for a selectable time period after the
trigger event. Holdoff
This exercise demonstrates how an input pattern
clock edge that is to be used as a trigger.
State triggering extends the logic triggering capability of the
by letting you select one of the inputs as a clock and using the other inpnts
as qualifiers.
This is useful when it
clock to detect a system state. For example, consider a synchronous
memory bus. The state trigger mode enables you to see only those events
that occur when reading from a block of memory.
To perform the following exercise use an
generator or another signal generator capable of the same
squarewave.
you need to change the trigger slope and
will
is
selected in time units, from
is
necessary to synchronize the display with a system
HP 8116A
i s
highlight e d.
is
highlighted.
turn
occur when the pattern is
DlS.
40
320
ns to
can be used to qualify a
5450lA
HP
Pnlse/Signal
1 MHz, 1
the
volt