HP 54501A Operation Reference page 67

Channel 1 is displayed in the top screen. To satisfy the conditions of the
bit pattern, channel 1 must be high (higher than the channel 1 trigger
level) or greater than -200mV. When the signal on channel 1 goes higher
than -200 m V and channel 4 is still low (less than -200 m V) the pattern
conditions have been satisfied
conditions and the HP 5450lA triggers.
•
Press the when key and change the condition to when exited.
The oscilloscope triggers on the first transition that makes the bit pattern
false, in this case when channel 4 goes high.
hp i
r unn ng
50.000 ns
Figure 6-7.
•
Change the bit pattern to HXXH and select the entered condition.
as
the signal is entering the trigger
s 50.000
0.00000
10.0 ns/ d i v
HXXL
when exited Pattern
PATTERN TRIGGER
edge 'Do ttern'
tv '
stote de l oy
x
ex ; ted
s
r ho l doff
Trigger Menu
6-13